What's a Good Sub for a 45V Zener?

  • Thread starter Watson A.Name - \"Watt Su
  • Start date
On 26 Mar 2004 15:45:35 -0800, Winfield Hill
<Winfield_member@newsguy.com> wrote:

Winfield Hill wrote...

Finally, mine can be programmed to 100V, simply by changing the
resistor ratio and using a common cheap TIP32C power transistor.
Try that with a wimply 2n4401. < score!

I can keep my comment about wimpy transistors, right? < score!

Thanks,
- Win

whill_at_picovolt-dot-com
Click to expand...
Certainly, if that's how you get your "jollies". The choice of
cascode device was for illustration purposes only... choose a beasty
as required.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

Throughout the history of this great country there have actually
been people of only two political persuasions: fighters and cowards.
WE MUST NOT LET THE LATTER PREVAIL IN THE NEXT ELECTION!
 
"Winfield Hill" <Winfield_member@newsguy.com> wrote in message
news:c42eq902hrq@drn.newsguy.com...
Jim Thompson wrote...

Maybe it's too subtle for you guys. Think TL431 connected normally,
but cathode protected against high voltage with a cascode device.

Nope, we get it just fine (as you can tell by looking at my versions
of TL431, LMV431 and LM385-adj designs, now and in the past). No,
the problem is not having everything in front of one while writing,
that is, no nice ASCII schematics to look at. < score! > :>)

Thanks,
- Win

whill_at_picovolt-dot-com
Click to expand...
Win did you move to Brazil?

Charles
 
Charles W. Johnson Jr. wrote...
Win did you move to Brazil?
Click to expand...
Is that soccer reporting? I'm don't know about that, but SCORE!
is the cry here in Boston whenever a rare hockey goal is scored.

Thanks,
- Win

whill_at_picovolt-dot-com
 
Jim Thompson wrote...
Winfield Hill wrote:

Winfield Hill wrote...

Finally, mine can be programmed to 100V, simply by changing the
resistor ratio and using a common cheap TIP32C power transistor.
Try that with a wimply 2n4401. < score!

I can keep my comment about wimpy transistors, right? < score!

Certainly, if that's how you get your "jollies". The choice of
cascode device was for illustration purposes only... choose a
beasty as required.
Click to expand...
OK, that's a valid point, but surely these aren't insignificant
issues if one's circuit is to work in a muscular fashion right
out of the box. Here's my earlier circuit in this thread,

. o 45V active zener
. | 2 to 100mA
. +----------,
. | irf510 |
. '--| 37.4k
. ,->|| |
. +--||------+ 7V
. | |
. | 4.53k
. \_|_ |
. / \_________| 2.495V
. /___\ |
. | 2.49k
. | TL431 |
. --+----------+-----
Click to expand...
Here's your circuit, ASCII rendition, with some annotation.

.. o 45V active zener
.. | 1.1 to 10mA
.. +------------,
.. | |
.. | 2n4401 |
.. +----, (2) |
.. | | 270k
.. | \| |
.. | |-----+
.. \| v/| | 19.5V
.. |--' |
.. v/| |
.. | 180k
.. \_|_ |
.. / \___________| 2.495V
.. /___\ |
.. | 27k
.. | TL431 |
.. --+------------+-----

Let's consider, at a measly 10mA you have 250mW dissipation in
the wimpy transistor and 200mW in the reference IC, which are
unattractively high values of dissipation for these parts. By
contrast I have only 25mW dissipation at 10mA in the regulator
(keeping its nasty tempco error under control), and only 4W in
a 43W power FET at a serious 100mA zener current. Surely my
modest values are better able to do well with real-world abuse.

This is because I picked 5V for the TL431 reference-regulator IC
rather than 18V in your design. Furthermore, you chose a wimpy
95uA divider current, despite the high 4uA reference-pin current,
whereas I chose a much more conservative 990uA divider current.

... < score! > < score! >

Thanks,
- Win

whill_at_picovolt-dot-com
 
Jim Thompson wrote:

Or use the version I announced on these newsgroups and posted to the
S.E.D/Schematics Page of my website two days ago ;-)

...Jim Thompson

Golly Jim,

It's not like transistor enhanced zeners haven't been thoroughly
discussed in the popular literature for the past 50 years.

The Q1 half of Win's circuit shows up for discussion in Jacob Millman's
1958 text book. Q2 is just a simple C-E amplifier.

Yours is the same as Millman's, but with a darlington replacing
Q1, and no C-E amplifier stage to boost the power capability.

Ho hum, not what I would call much of a contest of wits ;-)

-Chuck Harris


Your observation skills rival those of Win... it's a TL431, NOT a
zener. Pay attention to how it's connected. Sheeesh!

...Jim Thompson
Click to expand...
Comparing me with Win? Thanks for the complement!

-Chuck Harris

OBTW, I am quite aware that you are using a TL431 instead of a
zener. I am also aware that you are beating the piss out of
all of your active components.
 
On 26 Mar 2004 19:43:43 -0800, Winfield Hill
<Winfield_member@newsguy.com> wrote:

Jim Thompson wrote...

Winfield Hill wrote:

Winfield Hill wrote...

Finally, mine can be programmed to 100V, simply by changing the
resistor ratio and using a common cheap TIP32C power transistor.
Try that with a wimply 2n4401. < score!

I can keep my comment about wimpy transistors, right? < score!

Certainly, if that's how you get your "jollies". The choice of
cascode device was for illustration purposes only... choose a
beasty as required.

OK, that's a valid point, but surely these aren't insignificant
issues if one's circuit is to work in a muscular fashion right
out of the box. Here's my earlier circuit in this thread,

. o 45V active zener
. | 2 to 100mA
. +----------,
. | irf510 |
. '--| 37.4k
. ,->|| |
. +--||------+ 7V
. | |
. | 4.53k
. \_|_ |
. / \_________| 2.495V
. /___\ |
. | 2.49k
. | TL431 |
. --+----------+-----

Here's your circuit, ASCII rendition, with some annotation.

. o 45V active zener
. | 1.1 to 10mA
. +------------,
. | |
. | 2n4401 |
. +----, (2) |
. | | 270k
. | \| |
. | |-----+
. \| v/| | 19.5V
. |--' |
. v/| |
. | 180k
. \_|_ |
. / \___________| 2.495V
. /___\ |
. | 27k
. | TL431 |
. --+------------+-----

Let's consider, at a measly 10mA you have 250mW dissipation in
the wimpy transistor and 200mW in the reference IC, which are
unattractively high values of dissipation for these parts. By
contrast I have only 25mW dissipation at 10mA in the regulator
(keeping its nasty tempco error under control), and only 4W in
a 43W power FET at a serious 100mA zener current. Surely my
modest values are better able to do well with real-world abuse.

This is because I picked 5V for the TL431 reference-regulator IC
rather than 18V in your design. Furthermore, you chose a wimpy
95uA divider current, despite the high 4uA reference-pin current,
whereas I chose a much more conservative 990uA divider current.

... < score! > < score!

Thanks,
- Win

whill_at_picovolt-dot-com
Click to expand...
Win,

(1) My cascode version was posted two days before yours
(2) The OP asked only for a 45V zener to turn off his switcher: "I'm
gonna make a 6V to 45V V boost circuit that can put out a *few
mA*...", so designing for high currents is overkill.
(3) I know you'll come back with another retort, but I'm dropping out
of this thread... maybe I'll start a thread "Find All the Mistakes in
AoE" ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

Throughout the history of this great country there have actually
been people of only two political persuasions: fighters and cowards.
WE MUST NOT LET THE LATTER PREVAIL IN THE NEXT ELECTION!
 
"Winfield Hill" <Winfield_member@newsguy.com> wrote in message
news:c3uo4u03uj@drn.newsguy.com...
Watson A.Name - \"Watt Sun, the Dark Remover\" wrote...

"Pooh Bear" wrote ...

TL431

Yeah, i thought about that. But they're good only up to 36V.
Click to expand...
Thank you for the following, but I got onto the Nat'l and TI websites
and d/l'd the datasheets, and I'm puzzled. The LMV431 from National
says 36V max, but the TI data sheet says only 6V. Weird - such a large
discrepancy in specs.

In either case, the voltage can be kept below the max in the following
circuits, but just wondering what some poor soul would do if he subbed a
TLV for an LMV in a >6V circuit and wondered why it didn't work quite
right. :-O


The TL431 can handle up to 100mA, but not at its 36V maximum
rated voltage! Adding a cascode MOSFET allows both going up
to 0.1A and using higher voltages. The MOSFET's gate draws
no current (so it doesn't disturb the voltage divider), and
power MOSFETs come in TO-220 and other handy power packages.

. o 45V active zener
. | 2 to 100mA
. +----------,
. | irf510 |
. '--| 37.4k
. ,->|| |
. +--||------+ 7V
. | |
. | 4.53k
. \_|_ |
. / \_________| 2.495V
. /___\ |
. | 2.49k
. | TL431 |
. --+----------+-----

The TL431 requires 1mA minimum cathode current, which can be
a problem in some designs, but the TLV431 or LMV431 (either
is 80uA min) can be used instead (these have 1.24V references
instead of 2.5V). The TLV and LMV parts also have only 0.15uA
of reference-node current, compared to the TL431's rather high
2uA. They allow using lower divider currents, an important
consideration at high voltages to keep power consumption down.

At high currents the zener-diode shunt-regulator approach is
usually not as attractive as a pass-element regulator. We can
modify the circuit to become a regulator, for 100V shown below.

. 130 to 170Vdc
. ---+----------, High-voltage regulator
. | |
. 270k |--'
. | ||<-,
. +------||--+ irf630
. | |
. | +----o +100V
. | irf610 | to 200mA
. '--| 1.00M
. ,->|| |
. +--||------+ 10V
. | |
. | 88.7k
. \_|_ |
. / \_________| 1.24V
. /___\ |
. | 12.4k
. | LMV431 |
. --+----------+-----

With appropriate parts this design can be used to over 1kV. One
can consider adding a current-limit sense resistor and transistor
to the source of the pass FET.

Thanks,
- Win

whill_at_picovolt-dot-com
Click to expand...
 
I read in sci.electronics.design that Jim Thompson
<thegreatone@example.com> wrote (in <5t5b601fv15kbbhfi9jjknd8i49aavptas@
4ax.com>) about 'What's a Good Sub for a 45V Zener?', on Sat, 27 Mar
2004:
Throughout the history of this great country there have actually
been people of only two political persuasions: fighters and cowards.
Click to expand...
What about 'radical (rabid) centrists', democratic communists' and
aylwards?
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Sat, 27 Mar 2004 18:20:14 +0000, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Jim Thompson
thegreatone@example.com> wrote (in <5t5b601fv15kbbhfi9jjknd8i49aavptas@
4ax.com>) about 'What's a Good Sub for a 45V Zener?', on Sat, 27 Mar
2004:
Throughout the history of this great country there have actually
been people of only two political persuasions: fighters and cowards.

What about 'radical (rabid) centrists', democratic communists' and
aylwards?
Click to expand...
Sno-o-o-o-o-ort! ROTFLMAO! "aylwards" fits right into your grouping
;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

Throughout the history of this great country there have actually
been people of only two political persuasions: fighters and cowards.
WE MUST NOT LET THE LATTER PREVAIL IN THE NEXT ELECTION!
 
Your observation skills rival those of Win
Jim Thompson

Comparing me with Win? Thanks for the complement!
Chuck Harris
Click to expand...
Careful. It might be a 2's complement. :cool:
 
I read in sci.electronics.design that Jim Thompson
<thegreatone@example.com> wrote (in <gqhb60de830qbd2ladkv9f4hli8tlj2mq7@
4ax.com>) about 'What's a Good Sub for a 45V Zener?', on Sat, 27 Mar
2004:
Sno-o-o-o-o-ort! ROTFLMAO! "aylwards" fits right into your grouping
;-)
Click to expand...
It only fits by the assonance with 'cowards', nothing more. I notice you
changed 'yellow-bellies' to 'cowards' after my 'anti-canary rant' gag,
but without acknowledgement. My lawyer will contact yours.(;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
Jim Thompson wrote...
... The OP asked only for a 45V zener to turn off his switcher:
"I'm gonna make a 6V to 45V V boost circuit that can put out a
*few mA*...", so designing for high currents is overkill.
Click to expand...
Agreed, I wasn't answering the OP's limited, less interesting
question, but was playing with a 100mA active zener using two
added transistors, and contrasted it to yours purely as an
added pleasant recreational activity. My mis-remembering your
circuit posted elsewhere somewhat spoiled the fun, but fun it
was nonetheless. :>)

maybe I'll start a thread "Find All the Mistakes in AoE" ;-)
Click to expand...
In all seriousness, please be my guest, as we're well along
on a major re-write and requesting all suggestions and input.

Thanks,
- Win

whill_at_picovolt-dot-com
 
Subject: Re: What's a Good Sub for a 45V Zener?
From: "Watson A.Name - \"Watt Sun, the Dark Remover\"" NOSPAM@dslextreme.com
Date: 3/27/2004 9:36 AM Pacific Standard Time
Message-id: <106ber3l72f853b@corp.supernews.com


"Winfield Hill" <Winfield_member@newsguy.com> wrote in message
news:c3uo4u03uj@drn.newsguy.com...
Watson A.Name - \"Watt Sun, the Dark Remover\" wrote...

"Pooh Bear" wrote ...

TL431

Yeah, i thought about that. But they're good only up to 36V.

Thank you for the following, but I got onto the Nat'l and TI websites
and d/l'd the datasheets, and I'm puzzled. The LMV431 from National
says 36V max, but the TI data sheet says only 6V. Weird - such a large
discrepancy in specs.
snip
Click to expand...
Just went to TI's site because I just designed TL431's into a project and you
had me worried. I don't know what spec. your looking at but the device has an
adjustable max output V of 36 volts. So your wong dude!



Rocky
 
On 28 Mar 2004 04:09:44 GMT, the renowned rolavine@aol.com (Rolavine)
wrote:

Subject: Re: What's a Good Sub for a 45V Zener?
From: "Watson A.Name - \"Watt Sun, the Dark Remover\"" NOSPAM@dslextreme.com
Date: 3/27/2004 9:36 AM Pacific Standard Time
Message-id: <106ber3l72f853b@corp.supernews.com


"Winfield Hill" <Winfield_member@newsguy.com> wrote in message
news:c3uo4u03uj@drn.newsguy.com...
Watson A.Name - \"Watt Sun, the Dark Remover\" wrote...

"Pooh Bear" wrote ...

TL431

Yeah, i thought about that. But they're good only up to 36V.

Thank you for the following, but I got onto the Nat'l and TI websites
and d/l'd the datasheets, and I'm puzzled. The LMV431 from National
says 36V max, but the TI data sheet says only 6V. Weird - such a large
discrepancy in specs.
snip

Just went to TI's site because I just designed TL431's into a project and you
had me worried. I don't know what spec. your looking at but the device has an
adjustable max output V of 36 volts. So your wong dude!
Click to expand...
That last sentence manages 3 or 4 mistakes in 4 words. Impressive, but
you're not a Jedi yet.

LMV431- 35V abs max (30V recommended)
TLV431- 7V abs max (6V recommended)
TL431 - 37V abs max (36V recommended)


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Spehro Pefhany wrote:
On 28 Mar 2004 04:09:44 GMT, the renowned rolavine@aol.com (Rolavine)
wrote:


Subject: Re: What's a Good Sub for a 45V Zener?
From: "Watson A.Name - \"Watt Sun, the Dark Remover\"" NOSPAM@dslextreme.com
Date: 3/27/2004 9:36 AM Pacific Standard Time
Message-id: <106ber3l72f853b@corp.supernews.com


"Winfield Hill" <Winfield_member@newsguy.com> wrote in message
news:c3uo4u03uj@drn.newsguy.com...

Watson A.Name - \"Watt Sun, the Dark Remover\" wrote...

"Pooh Bear" wrote ...


TL431

Yeah, i thought about that. But they're good only up to 36V.

Thank you for the following, but I got onto the Nat'l and TI websites
and d/l'd the datasheets, and I'm puzzled. The LMV431 from National
says 36V max, but the TI data sheet says only 6V. Weird - such a large
discrepancy in specs.
snip

Just went to TI's site because I just designed TL431's into a project and you
had me worried. I don't know what spec. your looking at but the device has an
adjustable max output V of 36 volts. So your wong dude!


That last sentence manages 3 or 4 mistakes in 4 words. Impressive, but
you're not a Jedi yet.

LMV431- 35V abs max (30V recommended)
TLV431- 7V abs max (6V recommended)
TL431 - 37V abs max (36V recommended)


Best regards,
Spehro Pefhany
Click to expand...
"So your wong dude"? Did he mean "Sow your wong, dude"?
 
I'm a newbie, no in-depth knowledge expressed or implied.
Don't know whether this may be usefull but have a look at this site
Harry's Home Brew...

http://w1.859.telia.com/~u85920178/power/vconv_01.htm

He has a lot of usefull circuits and at worst there are several ways
to make your own Alcohol...

Cheers
 
"Scott B" <superscan811@operamail.com> wrote in message
news:4647a23d.0403280621.6bf5058e@posting.google.com...
I'm a newbie, no in-depth knowledge expressed or implied.
Don't know whether this may be usefull but have a look at this site
Harry's Home Brew...

http://w1.859.telia.com/~u85920178/power/vconv_01.htm

He has a lot of usefull circuits and at worst there are several ways
to make your own Alcohol...
Click to expand...
Not only are Harry's circuits useful, they're well thought out and
tested, and really do work. The only problenm with this inverter is
that the output is dependent on the supply voltage, .i.e. it's not
regulated. I had a URL for the circuit I'm gonna use, but it came back
as a national app note instead. In any case, it's simpilar to the one
on Bill Bowman's website. Here's the URL of a circuit that's closer to
what I had in mind, and of course mine is a lot lower power than this
one. http://www.aaroncake.net/circuits/6-12conv.htm


> Cheers
 
On a sunny day (28 Mar 2004 06:21:15 -0800) it happened
superscan811@operamail.com (Scott B) wrote in
<4647a23d.0403280621.6bf5058e@posting.google.com>:

I'm a newbie, no in-depth knowledge expressed or implied.
Don't know whether this may be usefull but have a look at this site
Harry's Home Brew...

http://w1.859.telia.com/~u85920178/power/vconv_01.htm

He has a lot of usefull circuits and at worst there are several ways
to make your own Alcohol...

Cheers
It is a cool circuit, but these multipliers have high zi, so
Click to expand...
can deliver little current.
Much simpler is to use a small pot core transformer, anyone can wind
some turns on it, much less components, more reliable,
better efficiency (all the diode voltage drops).
-------------------------------- + 5V
| |
--- 10u |
=== /
| b |<e
| ---| BC557
| | |\ c (general purpose PNP)
| | \
| | | -----------|>|---------------- + 45V
| | | | | 1N4148 |
|-- --- || {82t | |
| | 1t} | -{ | |
2k2 [ ] | | | {10t === ===
| ----- | | | 22n --- 10u
| pot core| | pol |
---------------------------------------------------------- GND

Something like this.

If you want to regulate / stabilize the output, I have done this
by using a series transistor in the input power, and using the
output via a voltage divider and zener / transistor to control that.
But that is less efficient.
To some extend you could try to control the base current of the bc557,
but that is always a bit tricky.
JP
 
Subject: Re: What's a Good Sub for a 45V Zener?
From: Fred Bloggs nospam@nospam.com
Date: 3/28/2004 3:46 AM Pacific Standard Time
Message-id: <4066BB16.6080307@nospam.com



Spehro Pefhany wrote:
On 28 Mar 2004 04:09:44 GMT, the renowned rolavine@aol.com (Rolavine)
wrote:


Subject: Re: What's a Good Sub for a 45V Zener?
From: "Watson A.Name - \"Watt Sun, the Dark Remover\""
NOSPAM@dslextreme.com
Date: 3/27/2004 9:36 AM Pacific Standard Time
Message-id: <106ber3l72f853b@corp.supernews.com


"Winfield Hill" <Winfield_member@newsguy.com> wrote in message
news:c3uo4u03uj@drn.newsguy.com...

Watson A.Name - \"Watt Sun, the Dark Remover\" wrote...

"Pooh Bear" wrote ...


TL431

Yeah, i thought about that. But they're good only up to 36V.

Thank you for the following, but I got onto the Nat'l and TI websites
and d/l'd the datasheets, and I'm puzzled. The LMV431 from National
says 36V max, but the TI data sheet says only 6V. Weird - such a large
discrepancy in specs.
snip

Just went to TI's site because I just designed TL431's into a project and
you
had me worried. I don't know what spec. your looking at but the device has
an
adjustable max output V of 36 volts. So your wong dude!


That last sentence manages 3 or 4 mistakes in 4 words. Impressive, but
you're not a Jedi yet.

LMV431- 35V abs max (30V recommended)
TLV431- 7V abs max (6V recommended)
TL431 - 37V abs max (36V recommended)


Best regards,
Spehro Pefhany

"So your wong dude"? Did he mean "Sow your wong, dude"?

Thanks for the correction, I was wrong, you were right. You know I've been
Click to expand...
wrong before, lol. I should have read the post more carefully before going in
to panic mode.

Rocky
 
Okay, here's the netlist for the circuit I drew in LTSpice. I swept the
V1 DC source, and looked at the output but nothing but the source
voltage is there. Presumably the thing's not oscillating. Like the
complete newbie to this that I am, I need some guidance on what to do
next. I've been playing with LTSpice all weekend and I've drawn a few
DC circuits, like the 45V zener that was posted here, and when I swept
the DC source, the output was like it should be, it zenered at a certain
point. But this one ain't doing that. The circuit is similar to the
one in the URL at the bottom.

The prog gives some errors because I abbrev'd the zener diode names so
they'd fit next to each other. But if I renamed them correctly, that
still wouldn't make it work. I need to take a class in this. :) But,
the turkeys shut down the electronics prog at our college, partly
because of cutbacks and partly because some of the teachers retired.
:-( Maybe I should try to find a FAQ or crib sheet online, or go to
OpAmp bookstore and buy a book on it, probably cost a bundle. Thanks
for any help.


* C:\Program Files\LTC\SwCADIII\DC-DC-6V-45V.asc
Q1 N003 N002 0 0 2N4401
Q2 N005 N006 0 0 2N4401
Q3 N004 N007 0 0 2N5550
R1 N001 N002 15k tol=5
R2 N001 N003 1k tol=5
R3 N001 N006 15k tol=5
R4 N001 N005 1k tol=5
R5 N007 N005 2.2k tol=5
R6 N008 0 10k tol=5
Q4 N007 N008 0 0 2N4401
L1 N001 N004 180ľH Ipk=.2
D1 N004 46Vout 1N4148
C1 N005 N002 1nF V=50V
C2 N006 N003 1nF V=50V
C3 0 46Vout 10ľF V=63V
V1 N001 0 6V Rser=10
D2 N008 P001 8V2L
D3 P001 P002 8V2L
D4 P002 N009 8V2L
D5 N009 N010 8V2L
D6 N010 P003 8V2L
D7 P003 46Vout 6V2L
..model D D
..lib C:\PROGRAM FILES\LTC\SWCADIII\lib\cmp\standard.dio
..model NPN NPN
..model PNP PNP
..lib C:\PROGRAM FILES\LTC\SWCADIII\lib\cmp\standard.bjt
..dc V1 0 6.6 .25
..backanno
..end


"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com>
wrote in message news:106e7djd1a7utaf@corp.supernews.com...
"Scott B" <superscan811@operamail.com> wrote in message
news:4647a23d.0403280621.6bf5058e@posting.google.com...
I'm a newbie, no in-depth knowledge expressed or implied.
Don't know whether this may be usefull but have a look at this site
Harry's Home Brew...

http://w1.859.telia.com/~u85920178/power/vconv_01.htm

He has a lot of usefull circuits and at worst there are several ways
to make your own Alcohol...

Not only are Harry's circuits useful, they're well thought out and
tested, and really do work. The only problenm with this inverter is
that the output is dependent on the supply voltage, .i.e. it's not
regulated. I had a URL for the circuit I'm gonna use, but it came
back
as a national app note instead. In any case, it's simpilar to the one
on Bill Bowman's website. Here's the URL of a circuit that's closer
to
what I had in mind, and of course mine is a lot lower power than this
one. http://www.aaroncake.net/circuits/6-12conv.htm


Cheers
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