45 Volt DC Power Supply

D

Dave.H

Guest
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 at www.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.
 
"Dave.H" <the1930s@googlemail.com> wrote in message
news:c77babaf-2e2d-41a1-aacc-0b0604092080@s37g2000prg.googlegroups.com...
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 at www.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.
Click to expand...
For the filament, as I recall the LM317 will go down to 1.5v, for your HT
why not use a voltage doubler cct with the 30vac tranny ? Since the upper
limit for the 317 would be above 30v you could use the one tranny.

Cheers ............. Rheilly
 
On Mar 16, 9:50 pm, "Rheilly Phoull" <rhei...@bigpong.com> wrote:
"Dave.H" <the19...@googlemail.com> wrote in message

news:c77babaf-2e2d-41a1-aacc-0b0604092080@s37g2000prg.googlegroups.com...

I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.

For the filament, as I recall the LM317 will go down to 1.5v, for your HT
why not use a voltage doubler cct with the 30vac tranny ? Since the upper
limit for the 317 would be above 30v you could use the one tranny.

Cheers ............. Rheilly
Click to expand...
I would like more info on this voltage doubler. As for the filament,
will probably run it on one or two D cells, don't mind replacing them,
and with only 60 mA current draw, will probably last quite a bit.
 
On Mar 16, 9:50 pm, "Rheilly Phoull" <rhei...@bigpong.com> wrote:
"Dave.H" <the19...@googlemail.com> wrote in message

news:c77babaf-2e2d-41a1-aacc-0b0604092080@s37g2000prg.googlegroups.com...

I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.

For the filament, as I recall the LM317 will go down to 1.5v, for your HT
why not use a voltage doubler cct with the 30vac tranny ? Since the upper
limit for the 317 would be above 30v you could use the one tranny.

Cheers ............. Rheilly
Click to expand...
So I can use an LM317 chip powered from the 30 volts for the
filament? How do I wire this up? Closest I can find is the LM317t
which handling 1.5 amps. If I use a voltage doubler, the voltage would
be around 60 volts. This radio wasn't cheap to buy, and I don't want
to damage it with to much voltage. Perhaps my 1 amp 23 volt DC switch
mode wall wart would be better instead of the transformer. It would be
cheap, just install the voltage doubler circuit in a plastic box, with
a DC plug at one end, and binding posts at the other.
 
On Mar 16, 10:28 pm, "Dave.H" <the19...@googlemail.com> wrote:
On Mar 16, 9:50 pm, "Rheilly Phoull" <rhei...@bigpong.com> wrote:



"Dave.H" <the19...@googlemail.com> wrote in message

news:c77babaf-2e2d-41a1-aacc-0b0604092080@s37g2000prg.googlegroups.com...

I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.

For the filament, as I recall the LM317 will go down to 1.5v, for your HT
why not use a voltage doubler cct with the 30vac tranny ? Since the upper
limit for the 317 would be above 30v you could use the one tranny.

Cheers ............. Rheilly

So I can use an LM317 chip powered from the 30 volts for the
filament? How do I wire this up? Closest I can find is the LM317t
which handling 1.5 amps. If I use a voltage doubler, the voltage would
be around 60 volts. This radio wasn't cheap to buy, and I don't want
to damage it with to much voltage. Perhaps my 1 amp 23 volt DC switch
mode wall wart would be better instead of the transformer. It would be
cheap, just install the voltage doubler circuit in a plastic box, with
a DC plug at one end, and binding posts at the other.
Click to expand...
Perhaps I can get another switch mode wall wart and wire the two in
series, both set at 23 volts. That will provide 46 volts DC.
I believe the one I already have is category # M9926 @ www.dse.com.au
Would probably need some sort of filtering to remove hum. I seem to
remember this is done with a large value electrolytic cap across the
secondary output.
 
On Mar 16, 1:27 am, "Dave.H" <the19...@googlemail.com> wrote:
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries.  I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA.  The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series.  If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts.  The tube is a # 30 type with 60 mA filament.
Click to expand...
I'd recommend that you do first try the 5 9V batteries, and some D
cells with a resistor for the filament. This will be the most hum-
free arrangement. Then when you build your supply you can compare the
level of hum with the battery arrangement to give you a performance
level to shoot for. One thing to make sure you do is put small (0.01
uF) capacitors across your rectifier diodes - otherwise when they go
into and out of conduction they can generate 120 Hz RF noise.

Mike
 
On Mar 16, 6:27 pm, "Dave.H" <the19...@googlemail.com> wrote:
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries.  I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA.  The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series.  If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts.  The tube is a # 30 type with 60 mA filament.
Click to expand...
Have you looked at the M0144
transformer? I don't think the taps you are proposing can be used in
series. Your filament current needs a separate transformer.

Cheers
 
On Mar 17, 4:39 am, Mike Silva <snarflem...@yahoo.com> wrote:
On Mar 16, 1:27 am, "Dave.H" <the19...@googlemail.com> wrote:

I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.

I'd recommend that you do first try the 5 9V batteries, and some D
cells with a resistor for the filament. This will be the most hum-
free arrangement. Then when you build your supply you can compare the
level of hum with the battery arrangement to give you a performance
level to shoot for. One thing to make sure you do is put small (0.01
uF) capacitors across your rectifier diodes - otherwise when they go
into and out of conduction they can generate 120 Hz RF noise.

Mike
Click to expand...
Might be the best way to go. Hell, if the batteries last long`enough,
I'll leave it like that. I can't see a one tube regen consuming too
much current anyway.
 
On Mar 17, 6:53 am, Varactor <Morefl...@gmail.com> wrote:
On Mar 16, 6:27 pm, "Dave.H" <the19...@googlemail.com> wrote:

I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.

Have you looked at the M0144
transformer? I don't think the taps you are proposing can be used in
series. Your filament current needs a separate transformer.

Cheers
Click to expand...
I did look at that one, but it's limited stock, not available at the
Shellharbour branch of DSE. I'll do what Mike said.
 
"Dave.H" <the1930s@googlemail.com> wrote in message
news:c77babaf-2e2d-41a1-aacc-0b0604092080@s37g2000prg.googlegroups.com...
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 at www.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.
Click to expand...
You might consider a switching boost power supply such as LT1268 which can
provide a regulated 45 VDC supply from 3 volt batteries, which can also be
your filament supply if you drop it down with a diode to 2.3 VDC. The
LT1268 is $8 from www.linear.com, but it will be cheaper in the long run
than 5 9V batteries, and the additional parts are only a few dollars. You
can also get less expensive switchers that might do the job, especially if
you use an external MOSFET. The 3 volt supply can make gate drive tricky,
but you could use a bipolar switch.

Other monolithic switchers that should work are LT1170HV, LT1070HV, LT1073,
and LT1072HV. The LTspice circuit follows:

Paul

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On 3ÔÂ16ČŐ, ĎÂÎç1Ęą27ˇÖ, "Dave.H" <the19...@googlemail.com> wrote:
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.
Click to expand...


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Dave.H wrote:
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 at www.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.
Click to expand...
Dave,
Your 5 nine volt batteries will last a long time, the current draw on a
1 tube regen is not much.

Sal
 
On 3ÔÂ16ČŐ, ĎÂÎç1Ęą27ˇÖ, "Dave.H" <the19...@googlemail.com> wrote:
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.
Click to expand...


Do you want access to China's massive pool of electronic
manufacturers... but lack the time to contact suppliers, negotiate
contracts, arrange shipping or monitor product quality? Don't worry -
Let seriouswholesale deal with all that for you.

*Check out the huge range of Gadgets, MP3 / MP4 Players, Car DVD /
Audio, and Computer Accessories now by visiting the online wholesale
catalog at seriouswholesale. com You'll have peace of mind thanks to
the seriouswholesale Quality Control, 12-month Warranty on all
products, and easy secure payment by credit card through Paypal.

Selling on eBay or your own online store? Send products direct from
our warehouse to your customers using our unique drop-shipping
service. You can profit by selling hundreds of different products,
without holding any of your own inventory! Any questions you have will
be answered by the seriouswholesale English-speaking customer support
team... Their aim is to make your China electronics importing business
easier to run than ever before.

Welcome to http://www.seriouswholesale.com.

seriouswholesale - Buy from the source, profit without the hassle.

- 12 Months Warranty - No minimum order restrictions - Drop-shipping
with no additional fee - Pay by safely by PayPal seriouswholesale
Wholesale Co., Ltd.: Chinas original and best online electronics
wholesaler & drop-shipper: seriouswholesale. com
 
On Mar 18, 12:39 pm, Sal Brisindi <salb...@optonline.SPAM.net> wrote:
Dave.H wrote:
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.

Dave,
Your 5 nine volt batteries will last a long time, the current draw on a
1 tube regen is not much.

Sal
Click to expand...
Thought not. I'll run it on the battereis, measure the current draw,
and see how it goes.
 
On 3ÔÂ16ČŐ, ĎÂÎç1Ęą27ˇÖ, "Dave.H" <the19...@googlemail.com> wrote:
I need a 45 volt DC power supply for a tube regenerative radio, but
don't like the idea of using 5 9 volt batteries. I found a
transformer I was thinking of using two in series, but I'm not sure
how safe 45 volts is at 500 mA. The transformers are AC/AC so I'll
also have to use some 1N4007 rectifiers.
Transformer is Cat# M2860 atwww.dse.com.au
I'm going to use the 30 volt tap on one and 15 volt tap on the other
and wire in series. If I also use a 4.5 or 6 volt transformer for the
tube filament, what resistor value would I need to get it down to 2
volts. The tube is a # 30 type with 60 mA filament.
Click to expand...


Do you want access to China's massive pool of electronic
manufacturers... but lack the time to contact suppliers, negotiate
contracts, arrange shipping or monitor product quality? Don't worry -
Let seriouswholesale deal with all that for you.

*Check out the huge range of Gadgets, MP3 / MP4 Players, Car DVD /
Audio, and Computer Accessories now by visiting the online wholesale
catalog at seriouswholesale. com You'll have peace of mind thanks to
the seriouswholesale Quality Control, 12-month Warranty on all
products, and easy secure payment by credit card through Paypal.

Selling on eBay or your own online store? Send products direct from
our warehouse to your customers using our unique drop-shipping
service. You can profit by selling hundreds of different products,
without holding any of your own inventory! Any questions you have will
be answered by the seriouswholesale English-speaking customer support
team... Their aim is to make your China electronics importing business
easier to run than ever before.

Welcome to http://www.seriouswholesale.com.

seriouswholesale - Buy from the source, profit without the hassle.

- 12 Months Warranty - No minimum order restrictions - Drop-shipping
with no additional fee - Pay by safely by PayPal seriouswholesale
Wholesale Co., Ltd.: Chinas original and best online electronics
wholesaler & drop-shipper: seriouswholesale. com
 
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