Hi all, I'm waiting for a stereo kit to arrive from chipamp and have been reading the build instructions again.
I now have a 300VA 2x22v transformer and hope to order a case on Monday, my plan is to follow the build plans to the letter and make a small power amp from the kit.
One thing puzzles me though, according to the build instructions the feedback capacitor is optional but shows it fitted to the boards in the picture. Is the lower DC offset this is supposed to achieve worth compromising sound quality and what is the possible consequences of leaving it out. Could its absence cause speaker damage?
Also I am considering using the tocos cosmos 20k pot with a source selector switch in a separate case with a very short interconnect to the power amp. My sources are MF - V-DAC & V-LPS which have low output impedance, can anyone see any problems with this arrangement and is there anything else I should consider before I start.
Cheers
Davy
I now have a 300VA 2x22v transformer and hope to order a case on Monday, my plan is to follow the build plans to the letter and make a small power amp from the kit.
One thing puzzles me though, according to the build instructions the feedback capacitor is optional but shows it fitted to the boards in the picture. Is the lower DC offset this is supposed to achieve worth compromising sound quality and what is the possible consequences of leaving it out. Could its absence cause speaker damage?
Also I am considering using the tocos cosmos 20k pot with a source selector switch in a separate case with a very short interconnect to the power amp. My sources are MF - V-DAC & V-LPS which have low output impedance, can anyone see any problems with this arrangement and is there anything else I should consider before I start.
Cheers
Davy
lol, that's quite a paper and it doesn't answer my question. Anyway I don't need to bother with most of it as I am buying a kit and rely on someone else to design the circuit properly, I have confidence in the designer.
I'll fit the feedback cap, can't see it causing much loss in sound quality and if it does, I doubt i'll notice.
The data sheet shows a 10k pot, chipamp's build sheet shows a 25k. I could try to do the maths involved but i'm not good with maths so i'm going to fit a 20k pot and hope it's good enough. The last half decent power amp I built was a World Audio Design kel84 tube amp kit. Not one shock - electrically speaking anyway.
I'll fit the feedback cap, can't see it causing much loss in sound quality and if it does, I doubt i'll notice.
The data sheet shows a 10k pot, chipamp's build sheet shows a 25k. I could try to do the maths involved but i'm not good with maths so i'm going to fit a 20k pot and hope it's good enough. The last half decent power amp I built was a World Audio Design kel84 tube amp kit. Not one shock - electrically speaking anyway.
But check this thread
http://www.diyaudio.com/forums/chip...ck-capacitor-hardly-no-dc-offset-voltage.html
He still needed a capacitor in hes feedback circuit, or else amp may go full retard (motorboating, oscillating)
http://www.diyaudio.com/forums/chip...ck-capacitor-hardly-no-dc-offset-voltage.html
He still needed a capacitor in hes feedback circuit, or else amp may go full retard (motorboating, oscillating)
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