strangedave wrote:I seem to be having a similar problem. I'm only up to the VCO, and the square seems to be working more or less OK (I can't get my sound card scope to work that well, but headphone probing sounds more or less like a saw and freq varies with pot), but from probing the square at R105 I get nothing, no DC bias at all and no sound.
Up until this point, everything seemed fine. Power supply is more or less as expected (my multimeter seems lacking significant digits, so I only tuned to 5.33v not 5.333v, but surely that is not a crisis). I'm putting a bit more than 3 v, maybe 3.5V or more, across r 90 due to a flaky power source, but again, should that be that big a problem?
Any suggestions? Should I just go ahead and build the rest of it for now?
kokoon wrote:okay i modded the wallwart (i went to 12 shops and found ZERO AC/AC wallwarts) - so i just pulled everything out of my AC/DC wallwart and connected the wires. now i can get a nice 4.5 - 13 VAC out of it (selectable)
however, plugging it into the x0xb0x didn't help one bit. everything is the same, all the voltages are the same... it looks like the whole thing could run off a 12VDC as well.
SubStyler wrote:check the area around C11, C31, C32 (voltages across) Q24, Q25 and the solder joints at S1.
maybe one of your eletcrolytic capacitors is bad or soldered in a wrong direction?
if you try to get saw wave, IC23 is getting hot?
Guest wrote:especially consdering that the sqaure
cannot exist with the saw
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