Total posts : 45366
Neil, The Vmid voltage is my “Fake Ground”, a point halfway between real ground and Vcc (15 VDC).
Yes, I noticed some problems with my Vmid floating around untill I lowered the the Voltage Divider Resistors (R15 & R12) to 1K. I guess I was just being lazy and should consider a dual supply. (All the other stuff uses single rail suply). Guess I figured the input caps allow theaudio to float and “fake the op amps out” to make them think Vmid was actually Ground.
Should I get a voltage converter like this and get rid of the Fake Ground nonsense?
I’m checking out the Precision Op Amp Rectfier now, however I have to be careful about noise triggering if I make it too sensitive. The ROKU Box (that feeds the audio) is pretty high-level and when the audio cuts out, there’s probasbly some signal there.?
Thanks for your help, Neil. Gotta run now and boil my first run of maple sap!