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?
Yes jumper for single ended if you want ground there on pcb.
Didn't separate avcc from pvcc because I don't feel like adjusting a 2nd/3rd/4th PSU and do not (expect the) need to remove sibilance (that way).
Oh I added a 10nF 100v cog between DC input, any technical objections to location??
Didn't separate avcc from pvcc because I don't feel like adjusting a 2nd/3rd/4th PSU and do not (expect the) need to remove sibilance (that way).
Oh I added a 10nF 100v cog between DC input, any technical objections to location??
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.
Higher noisefloor stereo then tested mono had new Alps pot as origin, now with Panasonic like used in mono test, hiss/noise is gone...
Will listen seriously tomorrow for a little time, too early for fair comparisons. Will have an cautious opinion about the ceramics tomorrow I guess 🙂 Decoupling ofcourse.
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.
🙂
Hi, can I use R11-20k resistor instead of 10k? I forgot to order it and only this part is blocking me to finish boards.
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.
A single 5A or 6A 12V brick seems enough for stereo board, it is insufficient for my PBTL's, bass output gets limited, but maybe that's load???????
afoor, randytsuch, col_s, ChrisMmm
Your boards (and ic's) were mailed out on Friday.
I am almost finished the test bed and then can get out some others that are waiting for testing.
Doug
Your boards (and ic's) were mailed out on Friday.
I am almost finished the test bed and then can get out some others that are waiting for testing.
Doug
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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
Awesome!
I'll take one joined ground plane pair, with soldered ICs + a kit for each.
I believe that's $94CDN excluding shipping. In a few weeks I'll be back in London.
Could you point me towards a post with the parts list in the kit?
Thanks Doug!
I'll take one joined ground plane pair, with soldered ICs + a kit for each.
I believe that's $94CDN excluding shipping. In a few weeks I'll be back in London.
Could you point me towards a post with the parts list in the kit?
Thanks 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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