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

Solid State Talk all about solid state amplification.

PR-800 ClassA/AB Amplifier Kit
PR-800 ClassA/AB Amplifier Kit
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 13th August 2017, 02:41 AM   #51
xextriz is offline xextriz  United States
diyAudio Member
Join Date: Aug 2017

I'm very interested in building an amplifier for a sound system I'm going to put together the next couple months or so. Would you be willing to provide a parts list of what is needed in addition to the PR-800? i'll be doing the same set up, a pair for 2 channels to 2 speakers. Thanks!
  Reply With Quote
Old 1st September 2017, 08:21 PM   #52
SwitchDoctor is offline SwitchDoctor
diyAudio Member
Join Date: Apr 2017
Default Additional components

In addition to the amplifier modules themselves (one per channel);
You'll need a +- 55v power supply.
Speaker protection boards (ebay <5)
Output capacitors 10,000 uf 300v (one per channel)
A 12v power supply for the bias input

For the power supplies i used:
35-0 35-0 torroid 300VA
2 x bridge rectifier
2 x 10,000 uf 100v capacitors for smoothing
4 x 4uf capacitors for smoothinh
2 x 100nf capacitors for smoothing

12-0 12-0 torroid 15w for the bias and speaker protection
  Reply With Quote
Old 5th October 2017, 01:11 PM   #53
MusicSeeker is offline MusicSeeker  France
diyAudio Member
Join Date: Jul 2010
Hello guys

Thank you Roclite for the schematics. I was also pissed off by the need of this extra transformer. After checking your schematic, I decided to add a resistor between GND and the anode of D5. Any value in the 1 to 10 Kohm does the result : the amp now works with its normal +V/GND/V- supply only. Is what I have done is correct and safe in the long run ?

  Reply With Quote
Old 15th October 2017, 01:20 PM   #54
SwitchDoctor is offline SwitchDoctor
diyAudio Member
Join Date: Apr 2017
I would advise using a separate bias supply. It only needs to be a small VA transformer and i used the 2nd winding from a 12-0-12 bias transformer to power my speaker protection circuit. That way the speakers shut off quickly without waiting for the main rail with it's huge smoothing caps to colapse.
  Reply With Quote


PR-800 ClassA/AB Amplifier KitHide 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
DOUK 5670+6AQ5+6E2 push-pull merge Class AB tube amp HIFI amplifier DIY KIT rigers Tubes / Valves 19 28th July 2015 12:49 PM
800 VAC toriod for LM4780 Amplifier Kit from Daniel Joerytech Chip Amps 8 29th December 2013 11:02 AM
An Exotic ClassA Amplifier (never seen before). ontoaba Solid State 8 10th February 2011 09:59 AM
Simple classA power amplifier Green_Age Solid State 10 22nd May 2010 11:09 AM

New To Site? Need Help?

All times are GMT. The time now is 04:11 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio