I can't see any shorts on the QPN pins with a magnifying glass. The caps look intact and measure 441/442 uF.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
I don't think so. It had a good centimetre gap on every side. I had metal standoffs (all I could find), but used nylon washers. The board was only handled by the edges and the polarity of the power supply was carefully checked.
I could give it another go, sitting it on a non-conductive surface.
Update: Still the same. Ticking sound seems confined to left channel.
I could give it another go, sitting it on a non-conductive surface.
Update: Still the same. Ticking sound seems confined to left channel.
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OK, I have no idea what's happened but I'll send you a new one on Monday.
If I include postage, would it be OK to return it so I can see what happened?
If I include postage, would it be OK to return it so I can see what happened?
What value/type of potentiometer would be optimum for your amp, assuming 20 db gain, 220 Ohm/2 Vrms source? I have a nice 100k pot from another project. Would that be a mismatch?
I see no reason why 100k wouldn't work, the input impedance at 20dB is 60k so a 100k pot should be just fine.
Thanks! According to the calculator, as long as my cable capacitance is under 400 pf, I should be OK. The trouble is, I have no idea what my cable capacitance would be. 🙂
I wouldn't worry about it. As long as the pot is less than a few feet away from the amp (which I assume it will be) then you'll be just fine.
New stAMP received, installed and running like a dream.
Fantastic customer service - thanks Sheldon.
You wouldn't get that from your average Chinese supplier.
The EMI filtering must be doing its job as the amp is powered by a laptop supply and sits behind a TV and on top of an STB. Again - no hiss, hum or crackle.
Fantastic customer service - thanks Sheldon.
You wouldn't get that from your average Chinese supplier.
The EMI filtering must be doing its job as the amp is powered by a laptop supply and sits behind a TV and on top of an STB. Again - no hiss, hum or crackle.
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