Design Me A Transformer, I Will Pay

I have tried to figure out how to do this but my education lacks. What do people like me do when they need something done they can't do ? Pay someone.

I need an audio transformer, actually a center tapped choke. I can't seem to source it so custom mad, oh well. You get what you pay for.

This has to be high quality for audio, not saturate or any of that and I need a low DCR.

This is the configuration;

Version 4
SHEET 1 880 680
WIRE 256 48 64 48
WIRE 368 48 256 48
WIRE 256 128 160 128
WIRE -32 176 -32 16
WIRE 64 176 64 144
WIRE 64 176 -32 176
WIRE 64 208 64 176
WIRE 368 208 256 208
WIRE 160 272 160 128
WIRE 256 304 256 208
WIRE 256 304 64 304
FLAG 160 272 0
SYMBOL ind 240 32 R0
SYMATTR InstName L1
SYMBOL ind 240 112 R0
SYMATTR InstName L2
SYMBOL pnp 0 48 R0
SYMATTR InstName Q1
SYMBOL pnp 0 304 M180
SYMATTR InstName Q2

The load consider to be four ohms from end to end. I need to push +30 volts into one end and have -30 volts come out the other end, able to feed low impedance. I need it to do that efficiently at least from 20-20,000.

How much ? Or do you want in on the deal ? They will go for like two grand so just 5% is a Cnote. If you're any kind of an audiophile I could just give you one of these amps. There really is nothing like them on the market.

If you can't get my email with your client software it is JURB6006 at gmail, and of course dot com. You can reply here, just how much do you want to do this ? I need wire size, number of turns and the core specifics. I know the basics about transformers but this is beyond me. Frequency response flat and all that, I have no clue. An RF transformer I could tune with caps, a power transformer, actually I tried using one once and the performance was not good.

I used to do this scrapping tube amps that had 4 and 16 ohm outputs with good results. The 4 is the center tap and the 0 and 16 are the ends. thing is if I go too high in power I am inducing a hell of alot of voltage into the "primary" which isn't really anymore. But it can arc and break down insulation. I would consider them but for that, I would need them in the higher wattage range. Without the "primary" it should save money and weight.

I have it mostly figured out except this. Well and one thing i want to do to the tone controls, at the highest turnover frequency the treble will have +/- 20dB range, if the turnover is lowered by the control to boost more of the spectrum I want to decrease the range so people don't blow their tweeters. I might make it switchable - "treble protection". Other than that over half the math is done and I am all the way back to the tone board, it is designed but I want a differential drive to the output circuit.

Interested in this ? I am not hard to find.

 

[John Larkin]

On Fri, 6 Sep 2019 11:33:37 -0700 (PDT), jurb6006@gmail.com wrote:

I have tried to figure out how to do this but my education lacks. What do people like me do when they need something done they can't do ? Pay someone.

I need an audio transformer, actually a center tapped choke. I can't seem to source it so custom mad, oh well. You get what you pay for.

This has to be high quality for audio, not saturate or any of that and I need a low DCR.

This is the configuration;

Version 4
SHEET 1 880 680
WIRE 256 48 64 48
WIRE 368 48 256 48
WIRE 256 128 160 128
WIRE -32 176 -32 16
WIRE 64 176 64 144
WIRE 64 176 -32 176
WIRE 64 208 64 176
WIRE 368 208 256 208
WIRE 160 272 160 128
WIRE 256 304 256 208
WIRE 256 304 64 304
FLAG 160 272 0
SYMBOL ind 240 32 R0
SYMATTR InstName L1
SYMBOL ind 240 112 R0
SYMATTR InstName L2
SYMBOL pnp 0 48 R0
SYMATTR InstName Q1
SYMBOL pnp 0 304 M180
SYMATTR InstName Q2

The load consider to be four ohms from end to end. I need to push +30 volts into one end and have -30 volts come out the other end, able to feed low impedance. I need it to do that efficiently at least from 20-20,000.

How much ? Or do you want in on the deal ? They will go for like two grand so just 5% is a Cnote. If you're any kind of an audiophile I could just give you one of these amps. There really is nothing like them on the market.

If you can't get my email with your client software it is JURB6006 at gmail, and of course dot com. You can reply here, just how much do you want to do this ? I need wire size, number of turns and the core specifics. I know the basics about transformers but this is beyond me. Frequency response flat and all that, I have no clue. An RF transformer I could tune with caps, a power transformer, actually I tried using one once and the performance was not good.

I used to do this scrapping tube amps that had 4 and 16 ohm outputs with good results. The 4 is the center tap and the 0 and 16 are the ends. thing is if I go too high in power I am inducing a hell of alot of voltage into the "primary" which isn't really anymore. But it can arc and break down insulation. I would consider them but for that, I would need them in the higher wattage range. Without the "primary" it should save money and weight.

I have it mostly figured out except this. Well and one thing i want to do to the tone controls, at the highest turnover frequency the treble will have +/- 20dB range, if the turnover is lowered by the control to boost more of the spectrum I want to decrease the range so people don't blow their tweeters. I might make it switchable - "treble protection". Other than that over half the math is done and I am all the way back to the tone board, it is designed but I want a differential drive to the output circuit.

Interested in this ? I am not hard to find.

Try todd <at> newava.com. I recently sent him a spec for a special
toroidal power transformer and he came back with a nice proposal and
decent pricing. He's done some good stuff for me before.

 

On Friday, September 6, 2019 at 2:33:42 PM UTC-4, jurb...@gmail.com wrote:

I have tried to figure out how to do this but my education lacks. What do people like me do when they need something done they can't do ? Pay someone.

I need an audio transformer, actually a center tapped choke. I can't seem to source it so custom mad, oh well. You get what you pay for.

This has to be high quality for audio, not saturate or any of that and I need a low DCR.

This is the configuration;

Version 4
SHEET 1 880 680
WIRE 256 48 64 48
WIRE 368 48 256 48
WIRE 256 128 160 128
WIRE -32 176 -32 16
WIRE 64 176 64 144
WIRE 64 176 -32 176
WIRE 64 208 64 176
WIRE 368 208 256 208
WIRE 160 272 160 128
WIRE 256 304 256 208
WIRE 256 304 64 304
FLAG 160 272 0
SYMBOL ind 240 32 R0
SYMATTR InstName L1
SYMBOL ind 240 112 R0
SYMATTR InstName L2
SYMBOL pnp 0 48 R0
SYMATTR InstName Q1
SYMBOL pnp 0 304 M180
SYMATTR InstName Q2

The load consider to be four ohms from end to end. I need to push +30 volts into one end and have -30 volts come out the other end, able to feed low impedance. I need it to do that efficiently at least from 20-20,000.

How much ? Or do you want in on the deal ? They will go for like two grand so just 5% is a Cnote. If you're any kind of an audiophile I could just give you one of these amps. There really is nothing like them on the market.

If you can't get my email with your client software it is JURB6006 at gmail, and of course dot com. You can reply here, just how much do you want to do this ? I need wire size, number of turns and the core specifics. I know the basics about transformers but this is beyond me. Frequency response flat and all that, I have no clue. An RF transformer I could tune with caps, a power transformer, actually I tried using one once and the performance was not good.

I used to do this scrapping tube amps that had 4 and 16 ohm outputs with good results. The 4 is the center tap and the 0 and 16 are the ends. thing is if I go too high in power I am inducing a hell of alot of voltage into the "primary" which isn't really anymore. But it can arc and break down insulation. I would consider them but for that, I would need them in the higher wattage range. Without the "primary" it should save money and weight.

I have it mostly figured out except this. Well and one thing i want to do to the tone controls, at the highest turnover frequency the treble will have +/- 20dB range, if the turnover is lowered by the control to boost more of the spectrum I want to decrease the range so people don't blow their tweeters. I might make it switchable - "treble protection". Other than that over half the math is done and I am all the way back to the tone board, it is designed but I want a differential drive to the output circuit.

Interested in this ? I am not hard to find.

There are many hundreds of custom design houses, and they do take orders for prototype small quantities like onesies. They have the manufacturing down to a triviality, usually working out the details in real time on their in house CAD in a few minutes of phone conversation. You just need to know what you want and be prepared to answer their questions about the application. Looking their quote spec sheet over beforehand should help. The product doesn't cost that much at all. Here is one as an example, I've never used them and don't know anything abut them- they're just an example:
https://www.custommag.com/custom-transformer-design

 

[Winfield Hill]

jurb6006@gmail.com wrote...
>
You don't need a transformer, you need power amplifiers
capable of 60 Vp-p and 15A. That's 900 watts. Or maybe
two 450-watt amps. There are class-D designs that can
handle that. In the event you have slightly miscalculated,
there are Chinese sellers of souped-up class-D chip eval
designs that can handle those power levels, selling for
quite low prices on eBay. I have purchased and received
a selection, and they're not so bad. Transformers suck.


--
Thanks,
- Win

 

[Phil Allison]

Winfield Hill while way out of his depth wrote:

You don't need a transformer, you need power amplifiers
capable of 60 Vp-p and 15A. That's 900 watts. Or maybe
two 450-watt amps. There are class-D designs that can
handle that. In the event you have slightly miscalculated,
there are Chinese sellers of souped-up class-D chip eval
designs that can handle those power levels, selling for
quite low prices on eBay. I have purchased and received
a selection, and they're not so bad. Transformers suck.

** Hummmm - use a class D chip amp or two plus no doubt a high falutin' SMPS *instead* of a simple iron core transformer.

That IS a damn novel idea.




..... Phil

 

[donald]

On a sunny day (6 Sep 2019 19:12:15 -0700) it happened Winfield Hill
<winfieldhill@yahoo.com> wrote in <qkv3lv02btn@drn.newsguy.com>:

jurb6006@gmail.com wrote...

You don't need a transformer, you need power amplifiers
capable of 60 Vp-p and 15A. That's 900 watts.

I presume you mean 60 Veff??

(60 / (2 * sqrt(2) ) ) * 15 = 318.198052 W

Wpeakpeak??
;-)

(Have not read the OP)

 

[Phil Allison]

donald where's your trousers wrote:

----------------------------------

Winfield Hill



You don't need a transformer, you need power amplifiers
capable of 60 Vp-p and 15A. That's 900 watts.

I presume you mean 60 Veff??

** Win is off with the fairies, again.

60Vp-p = 21.2V rms.

With a 4 ohm load that is 112 watts.

(Have not read the OP)

** Or even woken up ?



....... Phil

 

[Winfield Hill]

Phil Allison wrote...

** Win is off with the fairies, again.

60Vp-p = 21.2V rms.
With a 4 ohm load that is 112 watts.

Dunno what the O.P. is doing, but I always
like to think in terms of the max DC power.
Certainly when using a class-D MOSFET stage,
you're always considering the Vmax and Imax.
Pmax Pavg Pwhatever, posh, who cares?


--
Thanks,
- Win

 

On Fri, 6 Sep 2019 19:49:42 -0700 (PDT), Phil Allison
<pallison49@gmail.com> wrote:

Winfield Hill while way out of his depth wrote:



You don't need a transformer, you need power amplifiers
capable of 60 Vp-p and 15A. That's 900 watts. Or maybe
two 450-watt amps. There are class-D designs that can
handle that. In the event you have slightly miscalculated,
there are Chinese sellers of souped-up class-D chip eval
designs that can handle those power levels, selling for
quite low prices on eBay. I have purchased and received
a selection, and they're not so bad. Transformers suck.




** Hummmm - use a class D chip amp or two plus no doubt a high falutin' SMPS *instead* of a simple iron core transformer.

That IS a damn novel idea.




.... Phil

TPA3255 looks great. It's good for 600w mono or 300 stereo, for under
$10. I've just got to figure out an elegant way to heat sink it.

I can get a MeanWell 600 watt 48V power supply for something crazy
like $80.

 

[John S]

On 9/7/2019 12:52 PM, John S wrote:

On 9/6/2019 1:33 PM, jurb6006@gmail.com wrote:
I have tried to figure out how to do this but my education lacks. What
do people like me do when they need something done they can't do ? Pay
someone.

I need an audio transformer, actually a center tapped choke. I can't
seem to source it so custom mad, oh well. You get what you pay for.

This has to be high quality for audio, not saturate or any of that and
I need a low DCR.

This is the configuration;

Version 4
SHEET 1 880 680
WIRE 256 48 64 48
WIRE 368 48 256 48
WIRE 256 128 160 128
WIRE -32 176 -32 16
WIRE 64 176 64 144
WIRE 64 176 -32 176
WIRE 64 208 64 176
WIRE 368 208 256 208
WIRE 160 272 160 128
WIRE 256 304 256 208
WIRE 256 304 64 304
FLAG 160 272 0
SYMBOL ind 240 32 R0
SYMATTR InstName L1
SYMBOL ind 240 112 R0
SYMATTR InstName L2
SYMBOL pnp 0 48 R0
SYMATTR InstName Q1
SYMBOL pnp 0 304 M180
SYMATTR InstName Q2

The load consider to be four ohms from end to end. I need to push +30
volts into one end and have -30 volts come out the other end, able to
feed low impedance. I need it to do that efficiently at least from
20-20,000.

How much ? Or do you want in on the deal ? They will go for like two
grand so just 5% is a Cnote. If you're any kind of an audiophile I
could just give you one of these amps. There really is nothing like
them on the market.

If you can't get my email with your client software it is JURB6006 at
gmail, and of course dot com. You can reply here, just how much do you
want to do this ? I need wire size, number of turns and the core
specifics. I know the basics about transformers but this is beyond me.
Frequency response flat and all that, I have no clue. An RF
transformer I could tune with caps, a power transformer, actually I
tried using one once and the performance was not good.

I used to do this scrapping tube amps that had 4 and 16 ohm outputs
with good results. The 4 is the center tap and the 0 and 16 are the
ends. thing is if I go too high in power I am inducing a hell of alot
of voltage into the "primary" which isn't really anymore. But it can
arc and break down insulation. I would consider them but for that, I
would need them in the higher wattage range. Without the "primary" it
should save money and weight.

I have it mostly figured out except this. Well and one thing i want to
do to the tone controls, at the highest turnover frequency the treble
will have +/- 20dB range, if the turnover is lowered by the control to
boost more of the spectrum I want to decrease the range so people
don't blow their tweeters. I might make it switchable - "treble
protection". Other than that over half the math is done and I am all
the way back to the tone board, it is designed but I want a
differential drive to the output circuit.

Interested in this ? I am not hard to find.


If I understand your configuration correctly, you have an
autotransformer driven in a class B connection at the ends. The
transformer will need to have the thinnest laminations you can get in
order to handle the 20kHz. You will need to have enough laminations
(core) to not saturate at 20Hz. But the designer should know that. You
will need a wire size to handle the current (about 10ARMS) without
generating excessive heat and/or without excessive resistance.

I suggest the following specifications for your transformer:

Autotransformer (bifilar winding)
20Hz - 20kHz
Current - 10Arms
Voltage rating is not a problem. Even the wire enamel can handle it.
Suggested lamination source: Thomas & Skinner (No connection with them).

I designed transformers, but have no experience with audio.

By the way, this is my understanding of your topology:

Version 4
SHEET 1 880 680
WIRE 0 48 -208 48
WIRE 256 48 64 48
WIRE 368 48 256 48
WIRE 368 80 368 48
WIRE 256 128 160 128
WIRE -208 144 -208 128
WIRE 0 208 -208 208
WIRE 256 208 64 208
WIRE 368 208 368 160
WIRE 368 208 256 208
WIRE 160 272 160 128
WIRE -208 304 -208 288
FLAG 160 272 0
FLAG -208 144 0
FLAG -208 304 0
SYMBOL ind2 240 32 R0
SYMATTR InstName L1
SYMATTR Value 2
SYMATTR Type ind
SYMBOL ind2 240 112 R0
SYMATTR InstName L2
SYMATTR Value 2
SYMATTR Type ind
SYMBOL res 352 64 R0
SYMATTR InstName R1
SYMATTR Value 4
SYMBOL diode 64 32 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMATTR Value RFUH30TS6D
SYMBOL diode 64 192 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D2
SYMATTR Value RFUH60TS6D
SYMBOL voltage -208 32 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value SINE(0 32 20)
SYMBOL voltage -208 304 R180
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 32 20)
TEXT 200 -16 Left 2 !K1 L1 L2 1
TEXT -434 328 Left 2 !.tran 0 1000m 0

 

[John S]

On 9/6/2019 1:33 PM, jurb6006@gmail.com wrote:

I have tried to figure out how to do this but my education lacks. What do people like me do when they need something done they can't do ? Pay someone.

I need an audio transformer, actually a center tapped choke. I can't seem to source it so custom mad, oh well. You get what you pay for.

This has to be high quality for audio, not saturate or any of that and I need a low DCR.

This is the configuration;

Version 4
SHEET 1 880 680
WIRE 256 48 64 48
WIRE 368 48 256 48
WIRE 256 128 160 128
WIRE -32 176 -32 16
WIRE 64 176 64 144
WIRE 64 176 -32 176
WIRE 64 208 64 176
WIRE 368 208 256 208
WIRE 160 272 160 128
WIRE 256 304 256 208
WIRE 256 304 64 304
FLAG 160 272 0
SYMBOL ind 240 32 R0
SYMATTR InstName L1
SYMBOL ind 240 112 R0
SYMATTR InstName L2
SYMBOL pnp 0 48 R0
SYMATTR InstName Q1
SYMBOL pnp 0 304 M180
SYMATTR InstName Q2

The load consider to be four ohms from end to end. I need to push +30 volts into one end and have -30 volts come out the other end, able to feed low impedance. I need it to do that efficiently at least from 20-20,000.

How much ? Or do you want in on the deal ? They will go for like two grand so just 5% is a Cnote. If you're any kind of an audiophile I could just give you one of these amps. There really is nothing like them on the market.

If you can't get my email with your client software it is JURB6006 at gmail, and of course dot com. You can reply here, just how much do you want to do this ? I need wire size, number of turns and the core specifics. I know the basics about transformers but this is beyond me. Frequency response flat and all that, I have no clue. An RF transformer I could tune with caps, a power transformer, actually I tried using one once and the performance was not good.

I used to do this scrapping tube amps that had 4 and 16 ohm outputs with good results. The 4 is the center tap and the 0 and 16 are the ends. thing is if I go too high in power I am inducing a hell of alot of voltage into the "primary" which isn't really anymore. But it can arc and break down insulation. I would consider them but for that, I would need them in the higher wattage range. Without the "primary" it should save money and weight.

I have it mostly figured out except this. Well and one thing i want to do to the tone controls, at the highest turnover frequency the treble will have +/- 20dB range, if the turnover is lowered by the control to boost more of the spectrum I want to decrease the range so people don't blow their tweeters. I might make it switchable - "treble protection". Other than that over half the math is done and I am all the way back to the tone board, it is designed but I want a differential drive to the output circuit.

Interested in this ? I am not hard to find.

If I understand your configuration correctly, you have an
autotransformer driven in a class B connection at the ends. The
transformer will need to have the thinnest laminations you can get in
order to handle the 20kHz. You will need to have enough laminations
(core) to not saturate at 20Hz. But the designer should know that. You
will need a wire size to handle the current (about 10ARMS) without
generating excessive heat and/or without excessive resistance.

I suggest the following specifications for your transformer:

Autotransformer (bifilar winding)
20Hz - 20kHz
Current - 10Arms
Voltage rating is not a problem. Even the wire enamel can handle it.
Suggested lamination source: Thomas & Skinner (No connection with them).

I designed transformers, but have no experience with audio.

 

[Winfield Hill]

jlarkin@highlandsniptechnology.com wrote...

On Fri, 6 Sep 2019 19:49:42 -0700 (PDT), Phil Allison
pallison49@gmail.com> wrote:

Winfield Hill while way out of his depth wrote:

You don't need a transformer, you need power amplifiers
capable of 60 Vp-p and 15A. That's 900 watts. Or maybe
two 450-watt amps. There are class-D designs that can
handle that. In the event you have slightly miscalculated,
there are Chinese sellers of souped-up class-D chip eval
designs that can handle those power levels, selling for
quite low prices on eBay. I have purchased and received
a selection, and they're not so bad. Transformers suck.

** Hummmm - use a class D chip amp or two plus no doubt a
high falutin' SMPS *instead* of a simple iron core transformer.

That IS a damn novel idea.

TPA3255 looks great. It's good for 600w mono or 300 stereo, for
under $10. I've just got to figure out an elegant way to heat sink it.

If you check on eBay, you'll find lots of finished board
choices, with heatsinks mounted, etc., starting at $36,
free shipping. Some include toroid AC-line transformers,
etc., and a case.

I can get a MeanWell 600 watt 48V power supply for
something crazy like $80.

But the TPA3255 is less interesting to me, because it's
single-supply, with ac-coupled input and BTL output. As
opposed to split-supply types with DC coupling possible.


--
Thanks,
- Win

 

On 7 Sep 2019 12:20:44 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:

jlarkin@highlandsniptechnology.com wrote...

On Fri, 6 Sep 2019 19:49:42 -0700 (PDT), Phil Allison
pallison49@gmail.com> wrote:

Winfield Hill while way out of his depth wrote:

You don't need a transformer, you need power amplifiers
capable of 60 Vp-p and 15A. That's 900 watts. Or maybe
two 450-watt amps. There are class-D designs that can
handle that. In the event you have slightly miscalculated,
there are Chinese sellers of souped-up class-D chip eval
designs that can handle those power levels, selling for
quite low prices on eBay. I have purchased and received
a selection, and they're not so bad. Transformers suck.

** Hummmm - use a class D chip amp or two plus no doubt a
high falutin' SMPS *instead* of a simple iron core transformer.

That IS a damn novel idea.

TPA3255 looks great. It's good for 600w mono or 300 stereo, for
under $10. I've just got to figure out an elegant way to heat sink it.

If you check on eBay, you'll find lots of finished board
choices, with heatsinks mounted, etc., starting at $36,
free shipping. Some include toroid AC-line transformers,
etc., and a case.

I can get a MeanWell 600 watt 48V power supply for
something crazy like $80.

But the TPA3255 is less interesting to me, because it's
single-supply, with ac-coupled input and BTL output. As
opposed to split-supply types with DC coupling possible.

I'll be driving a huge custom toroidal output transformer, so
single-supply is fine. One concern is the output DC offset, which
could freak out the transformer: The Devil's Staircase thing. I guess
I'll add about 40,000 uF of electrolytics in the transformer primary,
just to be safe.

We do have the TI eval board and have been abusing the chip. Haven't
blown it up yet. I wouldn't want to base an aerospace test box on some
no-name Chinese amp board. And I want to include some sensing and
supervision stuff.

 

Some seem to be missing the point here.

The product doesn't cost that much at all. Here is one as an >example, I've never used them and don't know anything abut them- >they're just an example:
https://www.custommag.com/custom-transformer-design

Thanks, I'll check them out. But I have already been to a few companies and they don't seem to be interested.

>Try todd <at> newava.com. I recently sent him a spec for a >special toroidal power transformer and he came back with a nice >proposal and decent pricing. He's done some good stuff for me >before.

I'll check them out.

You don't need a transformer, you need power amplifiers
capable of...

You are not getting it, this is a brand new audiophile design. If I just wanted power I could buy from B&O, those Icepower modules. If I wanted that i would not be here.

** Hummmm - use a class D chip amp or two plus no doubt a high >falutin' SMPS *instead* of a simple iron core transformer.

That IS a damn novel idea.

B&O thought so and that is where the Icepower amps come from. Hundred watts no problem, no heat sinks. Well sure the copper on the board but the thing is smaller than an index card.-... that is about 10cm. by 15cm. The amps I have seen them in have little air flow and never a fan. They just don't get hot because they just don't waste energy.

Dunno what the O.P. is doing, but I always
like to think in terms of the max DC power.
Certainly when using a class-D MOSFET stage,
you're always considering the Vmax and Imax.
Pmax Pavg Pwhatever, posh, who cares?

I am building a solid state audiophile amp that most closely emulates the sound of tubes, but much better quality. Class D is out of the picture. I know what class D is and what it can do but it does not give me the sound I want. These things are going to go for two grand, and will be an all original design by me. I got the rest of it pretty much figured out but I lack the experise in transformers.

Autotransformer (bifilar winding)
20Hz - 20kHz
Current - 10Arms
Voltage rating is not a problem. Even the wire enamel can >handle it.
Suggested lamination source: Thomas & Skinner (No connection >with them).

I designed transformers, but have no experience with audio.

By bifilar do you mean the whole thing or insulated so I can wire it the right way ? I need it to be equally efficient going both ways, there really is no primary and secondary.

I have used output transformers for tube amps that had 0-4 and 16 taps on the secondary, but that was inducing much voltage on the "primary" which was not a primary anymore. When i get to the power I want those will not work, the primary will short out by arcing.

If you check on eBay, you'll find lots of finished board
choices, with heatsinks mounted, etc., starting at $36,
free shipping. Some include toroid AC-line transformers,
etc., and a case.

I am BUILDING this.

Anyway, thanks for the responses. I got a couple more leads to try to get these.

The whole design is brand new. the outputs, drivers, predrivers, prepredrivers all run on a resistive stack. The feedback is distributed, not global like most amps.

I could probably work this up on LTSpice as long as you can comprehend that L1 and L2 are one coil. It won't make any kind of simulation work right but it could illustrate the concept.

But do I want to reveal it ? This is totally new, I have seen more topologies for audio amps than I care to remember. There is no off the shelf solution for what I want. There is no chip, no board, no nothing. In fact I might have trouble even finding suitable output transistor because they will be PNP. Darlingtons would be great, but i want the best of the best. Two grand each for these things, they have to be top notch.

Thanks for wasting your time on me. I appreciate it. I will check out the links.

Still, someone who knows what they're doing tell me how many turn of what gauge wire on a core of what size and composition, I would pay.

 

[Phil Allison]

Some fuckwit retard posnig as jurb...@gmail.com wrote:
======================================================

You don't need a transformer, you need power amplifiers
capable of...

You are not getting it, this is a brand new audiophile design. If I just wanted power I could buy from B&O, those Icepower modules. If I wanted that i would not be here.

** Keep away from them - expensive, designed to fail and non repairable.

Go one on my bench right now.

** Hummmm - use a class D chip amp or two plus no doubt a high >falutin' SMPS *instead* of a simple iron core transformer.

That IS a damn novel idea.

B&O thought so and that is where the Icepower amps come from.

** Absurd fucking crap.

B&O never did any such thing.

I am building a solid state audiophile amp that most closely emulates the sound of tubes, but much better quality. Class D is out of the picture. I know what class D is and what it can do but it does not give me the sound I want. These things are going to go for two grand, and will be an all original design by me. I got the rest of it pretty much figured out but I lack the experise in transformers.

** This monumental fool lacks the basic common sense to realise how idiotic he is.

Another demented troll, wasting all of our times here.

Yawnnnnnn ....



...... Phil

 

[Phil Allison]

John Smug, imitating a troll wrote:
--------------------------------

jurb6006@gmail.com wrote:

This has to be high quality for audio, not saturate or any of that
and I need a low DCR.



If I understand your configuration correctly, you have an
autotransformer driven in a class B connection at the ends. The
transformer will need to have the thinnest laminations you can get in
order to handle the 20kHz.

** Utter nonsense.

It's a wide band audio power tranny, not a SMPS.

You will need to have enough laminations
(core) to not saturate at 20Hz.

** Right, full power at 20Hz happens all the time in audio ...

Strewth.

I suggest the following specifications for your transformer:

Autotransformer (bifilar winding)
20Hz - 20kHz
Current - 10Arms
Voltage rating is not a problem. Even the wire enamel can handle it.
Suggested lamination source: Thomas & Skinner (No connection with them).

I designed transformers, but have no experience with audio.

** If you did, you might know that a standard, tape wound toriodal core auto-tranny would meet the OP's spec with complete ease.

But you don't, so you didn't.


..... Phil

 

[Phil Allison]

Winfield Hill wrote:

Phil Allison wrote...

** Win is off with the fairies, again.

60Vp-p = 21.2V rms.
With a 4 ohm load that is 112 watts.

Dunno what the O.P. is doing,

** Reading his posts might be a help ...

Not taking things so literally would be another.

but I always
like to think in terms of the max DC power.

** While ignoring all other information ?

You are just adding to you original absurdity.

Certainly when using a class-D MOSFET stage,
you're always considering the Vmax and Imax.
Pmax Pavg Pwhatever, posh, who cares?


** Well clearly you don't.

Like I said already - way out of your depth and drowning.

Gurgle, gurgle gurgle....



....... Phil

 

On Sun, 8 Sep 2019 04:24:17 -0700 (PDT), Phil Allison
<pallison49@gmail.com> wrote:

John Smug, imitating a troll wrote:
--------------------------------


jurb6006@gmail.com wrote:

This has to be high quality for audio, not saturate or any of that
and I need a low DCR.



If I understand your configuration correctly, you have an
autotransformer driven in a class B connection at the ends. The
transformer will need to have the thinnest laminations you can get in
order to handle the 20kHz.


** Utter nonsense.

It's a wide band audio power tranny, not a SMPS.



You will need to have enough laminations
(core) to not saturate at 20Hz.

** Right, full power at 20Hz happens all the time in audio ...

Strewth.


I suggest the following specifications for your transformer:

Autotransformer (bifilar winding)
20Hz - 20kHz
Current - 10Arms
Voltage rating is not a problem. Even the wire enamel can handle it.
Suggested lamination source: Thomas & Skinner (No connection with them).

I designed transformers, but have no experience with audio.


** If you did, you might know that a standard, tape wound toriodal core auto-tranny would meet the OP's spec with complete ease.

It might weigh 100 pounds.

 

On Sun, 8 Sep 2019 04:15:35 -0700 (PDT), Phil Allison
<pallison49@gmail.com> wrote:

Winfield Hill wrote:

Phil Allison wrote...

** Win is off with the fairies, again.

60Vp-p = 21.2V rms.
With a 4 ohm load that is 112 watts.

Dunno what the O.P. is doing,


** Reading his posts might be a help ...

Not taking things so literally would be another.


but I always
like to think in terms of the max DC power.

** While ignoring all other information ?

You are just adding to you original absurdity.


Certainly when using a class-D MOSFET stage,
you're always considering the Vmax and Imax.
Pmax Pavg Pwhatever, posh, who cares?


** Well clearly you don't.

Like I said already - way out of your depth and drowning.

Gurgle, gurgle gurgle....

Yeah, Win is an amateur at electronics, compared to someone with your
decades of experience fixing broken guitar pedals.

You should write a book.

 

[John S]

On 9/8/2019 6:32 AM, Phil Allison wrote:

Some fuckwit retard posnig as jurb...@gmail.com wrote:
=======================================================


You don't need a transformer, you need power amplifiers
capable of...

You are not getting it, this is a brand new audiophile design. If I just wanted power I could buy from B&O, those Icepower modules. If I wanted that i would not be here.


** Keep away from them - expensive, designed to fail and non repairable.

Go one on my bench right now.


** Hummmm - use a class D chip amp or two plus no doubt a high >falutin' SMPS *instead* of a simple iron core transformer.

That IS a damn novel idea.

B&O thought so and that is where the Icepower amps come from.


** Absurd fucking crap.

B&O never did any such thing.





I am building a solid state audiophile amp that most closely emulates the sound of tubes, but much better quality. Class D is out of the picture. I know what class D is and what it can do but it does not give me the sound I want. These things are going to go for two grand, and will be an all original design by me. I got the rest of it pretty much figured out but I lack the experise in transformers.


** This monumental fool lacks the basic common sense to realise how idiotic he is.

Another demented troll, wasting all of our times here.

Yawnnnnnn ....



..... Phil

Since you are bored and don't want to help, go away.