Did some testing and all was okSo now a little music is playing...
Looking great.
The jumper on the input block is for single ended use rather than balanced?
And it looks like you haven't separated pin 17 supply, any reason?
Looks good.
Make sure the gnd connection between boards is really low impedance if using a single supply.
Any power-up thump or click? I would like feedback on the power-up mute circuit effectiveness.
Doug
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For comparison reasons, helping a friend, inputs are 10uF ceramics at the moment, no thump, muffled soft click after little time when chip switches on or unmutes, I haven't looked at what circuit does, didn't really had need for it but doesn't hurt either
When using cdplayer as location for shieldground I have same whistle-like noise only lower volume as with the Neutrik audiotransformers on input, so maybe a capacitor in cdplayer somewhere is making that noise??? Almost completely quiet stereo now, completely quiet when tested mono, so yes grounding may play role there.
When using cdplayer as location for shieldground I have same whistle-like noise only lower volume as with the Neutrik audiotransformers on input, so maybe a capacitor in cdplayer somewhere is making that noise??? Almost completely quiet stereo now, completely quiet when tested mono, so yes grounding may play role there.
First impression is very good. So maybe ceramics can work. Still need to have little more time and compare with hiampmini's.
Dug what is the little + middle of pcb between chip and inductors? Was looking at that soldering all little smd's and forgot to ask earlier, it isn't speaker or trace polarity, you left a design-cursor there?
Dug what is the little + middle of pcb between chip and inductors? Was looking at that soldering all little smd's and forgot to ask earlier, it isn't speaker or trace polarity, you left a design-cursor there?
It is actually one of the polarity symbols for the large power supply caps...just not in the correct place.
Power supply for dual mono
I have been using 120va toroid (2 @ 15v windings 4A each) for single stereo TPA3116 boards and this has worked well. I get 21v at the amp.
Using 2 of Doug's boards making a stereo pair do you think the power demand goes up to any degree? I mean at the speaker it would still be the same demand per channel even tho 2 chips now supply the power. My thinking is this is still an adequate transformer but would appreciate some opinions.
I have been using 120va toroid (2 @ 15v windings 4A each) for single stereo TPA3116 boards and this has worked well. I get 21v at the amp.
Using 2 of Doug's boards making a stereo pair do you think the power demand goes up to any degree? I mean at the speaker it would still be the same demand per channel even tho 2 chips now supply the power. My thinking is this is still an adequate transformer but would appreciate some opinions.
Not too late.
I am slowly clearing orders so it might be a little while (a few weeks) before I get to you.
If you can wait I will put you on the list.
Did you want the boards separate or joined at the ground plane? ( labeled as 1 pair)
Doug
Post 168 on page 17...assuming those part numbers are still in stock.
Probably order kit parts this weekend.
Doug
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