Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

psu design problem
psu design problem
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 2nd November 2004, 12:49 AM   #1
then_dude is offline then_dude  Belgium
diyAudio Member
Join Date: Dec 2003
Location: brussels
Default psu design problem

hello everybody,

i wanna build an amp : an push pull el84; that is also driven by an el84

the problem is that i have already material lying around.

i have a power supply that if you put 220 on it (i live in europe) you get 140 volt out of it. (0.2amp)

the orginal design was an push pull el84 driven by 3 ecc83, and also 2*ecc83 for the phono stage.

i will have to put an extra trannie for the heaters.

but now the real problem, i 'm gonna go solid state psu, because it's a first project, and also wanna keep the cost low. In the original there is a voltage doubler (the one you get with the psu designer, hahaha, it uses 100uf) , so it puts out 280 volt, that's allright, (i has to be 300 but i don't think i can get that, or am i wrong, still with 280 i gotta work also).

but what after that voltage doubler ? a snubber circuit, and an CRC or CLC circuit and how to implement ?

i find psu schemes the hardest of an amplifier, that's why i call the help of some guys. i have already simulated with the psu designer, but don't feel to sure about it. so any help is welcome

thanx guys
  Reply With Quote
Old 2nd November 2004, 09:19 PM   #2
resident is offline resident
Account Disabled
Join Date: Sep 2004
Location: Earth
Why don't you feel so sure with PSUD2.It's a cool program and works.
  Reply With Quote
Old 2nd November 2004, 09:24 PM   #3
yagoolar is offline yagoolar  Poland
diyAudio Member
yagoolar's Avatar
Join Date: Oct 2004
Location: Warsaw, PL
Send a message via ICQ to yagoolar psu design problem

You should not be skeptical. I always use it and it *is* accurate.

  Reply With Quote
Old 2nd November 2004, 09:51 PM   #4
yagoolar is offline yagoolar  Poland
diyAudio Member
yagoolar's Avatar
Join Date: Oct 2004
Location: Warsaw, PL
Send a message via ICQ to yagoolar psu design problem
Hi then_dude,

If I were you, I would go something like that (see attached file). This sim was quick and I don't know much about your PP setup, voltages and so on. I assumed 0.1 A per channel / one psu. However with 1 xformer per channel this does not give you much room for output power and might be insufficient.

(PSUD2, accuracy=high, f=50Hz, Ui=240V, offload Vo=140V)
Attached Images
File Type: jpg then_dude_psu.jpg (96.0 KB, 206 views)
  Reply With Quote
Old 3rd November 2004, 03:23 AM   #5
jackinnj is offline jackinnj  United States
diyAudio Member
jackinnj's Avatar
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
psu design problem
Play around with the transformer -- if you have the nerve you can use a spare filament transformer to place 12.6VAC onthe 6.3VAC winding -- this will double the voltage on the HV secondary (of course, you disconnect the original primary connections );!

a doubler works fine for tube devices -- very suitable for regulation, the displayed image is a regulator with an LM317 regulator which has its adjust pin lifted by a zener string (courtesy of National Semiconductor) Click the image to open in full size.
  Reply With Quote


psu design problemHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Crossover Design Problem lscangus Multi-Way 1 25th November 2005 06:07 AM
PCB Design problem.. Pls advice xitronics Everything Else 5 29th October 2005 06:19 PM
Ongoing bass cab design problem TheoM Subwoofers 15 8th September 2004 05:24 AM
CFP output design problem Duo Solid State 7 19th January 2004 11:38 PM
subwoofer design problem pkgum Subwoofers 90 30th December 2001 01:12 AM

New To Site? Need Help?

All times are GMT. The time now is 12:20 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio