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

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!
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Old 1st September 2017, 08:21 PM   #52
SwitchDoctor is offline SwitchDoctor
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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
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Old 5th October 2017, 01:11 PM   #53
MusicSeeker is offline MusicSeeker  France
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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 ?

Thanks
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Old 15th October 2017, 01:20 PM   #54
SwitchDoctor is offline SwitchDoctor
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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.
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