Go Back   Home > Forums > >

The diyAudio Store A forum for discussing anything about the products available in The diyAudio Store.

V3 Universal Power Supply Circuit Board
V3 Universal Power Supply Circuit Board
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
Reply
 
Thread Tools
Old 22nd September 2020, 01:01 AM   #421
Wessideg is offline Wessideg
diyAudio Member
 
Join Date: Jul 2020
Location: St. Paul, MN, (previously Detroit, MI Marquette, MI, etc.)
V3 Universal Power Supply Circuit Board
Thanks, I appreciate it.
  Reply With Quote
Old 22nd September 2020, 01:14 AM   #422
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
V3 Universal Power Supply Circuit Board
The circuit with 7812 is incredibly simple, just a small cap (value not very critical) on each side of the regulator. If you get one in TO-220FP (the plastic insulated version) you can just attach to the chassis floor for heatsinking. The caps and wires can be attached directly to the pins.
Attached Images
File Type: jpeg 225BD265-5969-4E9C-B260-DF27598FE386.jpeg (31.6 KB, 223 views)

Last edited by 6L6; 22nd September 2020 at 01:26 AM.
  Reply With Quote
Old 16th October 2020, 01:56 PM   #423
myleftear is offline myleftear  Switzerland
diyAudio Member
 
myleftear's Avatar
 
Join Date: Sep 2017
Location: Luzern
V3 Universal Power Supply Circuit Board
Default Adjustments for F4?

Hello
Uhm, so for the F4 which becomes true, what adjustments should I make concerning the bleeder resistor (R9, R10), and since Ill try making the rectifier part too, is the output snubber required? (Not sure anymore about this, whether it is not required because of the constant current draw of a class-A amp?
Ill try not to ask too many too basic question (except these 2 for a starters)
Thank you
All the best
d.
__________________
dobedobedo...
  Reply With Quote
Old 16th October 2020, 03:01 PM   #424
myleftear is offline myleftear  Switzerland
diyAudio Member
 
myleftear's Avatar
 
Join Date: Sep 2017
Location: Luzern
V3 Universal Power Supply Circuit Board
Default Adjustments for F4?

Hello
Uhm, so for the F4 which becomes true, what adjustments should I make concerning the bleeder resistor (R9, R10), and since Ill try making the rectifier part too, is the output snubber required? (Not sure anymore about this, whether it is not required because of the constant current draw of a class-A amp?
Ill try not to ask too many too basic question (except these 2 for a starters)
Thank you
All the best
d.
__________________
dobedobedo...
  Reply With Quote
Old 16th October 2020, 03:34 PM   #425
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
V3 Universal Power Supply Circuit Board
Bleeder resistor is there to discharge the capacitor bank after power-off. It’s value is not critical at all. 2.2k is a common value and works perfectly. Anything from 1.5k to 10k is again, completely fine.

Leave the output snubber open. The next PSU will not have one, it’s worthless.
  Reply With Quote
Old 16th October 2020, 04:18 PM   #426
myleftear is offline myleftear  Switzerland
diyAudio Member
 
myleftear's Avatar
 
Join Date: Sep 2017
Location: Luzern
V3 Universal Power Supply Circuit Board
Thank you, 6L6!

(And you were quite right on the F4/PSU: pretty nice to put together, once the scare is shaken off V3 Universal Power Supply Circuit Board)
__________________
dobedobedo...
  Reply With Quote
Old 1st November 2020, 02:03 PM   #427
AddiDub is offline AddiDub  Germany
diyAudio Member
 
Join Date: Jan 2016
I have build a Universal Power Supply circuit board. It seems to work fine and i tested it with my M2x boards, drawing 2,6A per PSU rail. My toroid ist a bit oversized with 500VA.

My negative voltage rail seems to have unmeasurable AC voltage at the output, while my positive rail measures around 50 mV ripple voltage. Measurements are the same with load applied or without load.

I triple checked all solder connections. Does anyone have an Idea how to find the culprit?
  Reply With Quote
Old 2nd November 2020, 07:48 PM   #428
AddiDub is offline AddiDub  Germany
diyAudio Member
 
Join Date: Jan 2016
I will answer my own question. First i realised that i used a wrong range setting for measuring the AC ripple voltage at the output. When i use the "mV" setting my DVM reads around 7mV ripple (not 50mV) between V+ and ground.

My DVM only measures AC voltage when i connect the red clamp to the point with higher DC potential and the black probe to the point with lower DC potential. To measure the positive rail i had to connect the red clamp to V+ and the black clamp to ground. To measure AC ripple voltage on the negative rail i had to connect the red probe to ground and the black probe to V-.

Using this method and the mV range on my DMM both positive and negative rail measures AC ripple voltage around 7mV.
I will repeat measurements next weekends using my CRO. I was too lazy to set it up in my living room workshop that must be cleaned after every DIY session.

Last edited by AddiDub; 2nd November 2020 at 07:53 PM.
  Reply With Quote
Old 24th November 2020, 01:33 AM   #429
DaveFred is online now DaveFred  Canada
diyAudio Member
 
Join Date: Jan 2018
Location: London, Ontario, Canada
V3 Universal Power Supply Circuit Board
Question about PI resistors,

Are they recommended for Class AB or just Class A amplifiers?

Thank you,

David.
  Reply With Quote
Old 24th November 2020, 06:42 PM   #430
Ben Mah is online now Ben Mah  Canada
diyAudio Member
 
Join Date: May 2012
Location: Vancouver
V3 Universal Power Supply Circuit Board
Class AB amps draw varying amount of current so a CRC filter would vary the voltage available, depending on the value of the resistor. The current could vary from tens of milliAmperes to many Amperes, so the power supply voltage variation due to the voltage drop across the resistor could be quite large.

Class A amps on the other hand have only small current variation so the power supply voltage variation is quite small.

Although a C filter has much higher ripple than a CRC filter, Class AB amps are push-pull and they have high Power Supply Rejection Ratio (PSRR), so higher ripple can be tolerated compared to a single ended amp which has low PSRR.
  Reply With Quote

Reply


V3 Universal Power Supply Circuit BoardHide this!Advertise here!
Thread Tools

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
ACA with Universal Power Supply bnorrish Pass Labs 11 15th December 2019 10:51 PM
Universal Power Supply PCB Peter Daniel Audio Sector 78 13th December 2019 02:13 PM
Universal power supply board for audio amplifier siliconray Siliconray Online Electronics Store 11 13th February 2012 06:24 AM
■■■■Free Universal Power Supply Board For Tube Amplifiers ■■■■ siliconray Siliconray Online Electronics Store 2 10th January 2012 10:05 AM
My (almost universal) power supply Yoshy Power Supplies 0 7th September 2008 01:18 AM


New To Site? Need Help?

All times are GMT. The time now is 02:09 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki