I finsihed the VCO today, and believe it or not........ it doesn't
work either :( :( :( :(
(in my defense, so far every problem I have had in the past couple of
weeks has turned out to be outside of my control.. ray wilson EG - bad
ic, ray wilson sample hold - the schematic was wrong, synthacon filter
- power supply and bad solder pad) so.. if I haven't exceeded my help
quota, on to this problem..
When I first powered it on, w/ headphones plugged into the ramp, I got
sound!! then when I adjusted the zero trim to 0, the sound went up
and up and up to the point where I think the frequency is just so high
that I can't hear it. The more positive volts I put on the zero
trimmer, the lower the tone gets. I have checked for the obvious.. no
obvious soldering mistakes, polarity and components are all correct..
I have to admit, I haven't checked the value of every resistor, but I
am very careful when populating the PCB.
when the 0 trimmer had about 7 volts on ic1 pin7 I checked the FM and
v/o inputs, and they did work
Any ideas where I should start looking for the problem?
thanks. again, and again...
Scott
work either :( :( :( :(
(in my defense, so far every problem I have had in the past couple of
weeks has turned out to be outside of my control.. ray wilson EG - bad
ic, ray wilson sample hold - the schematic was wrong, synthacon filter
- power supply and bad solder pad) so.. if I haven't exceeded my help
quota, on to this problem..
When I first powered it on, w/ headphones plugged into the ramp, I got
sound!! then when I adjusted the zero trim to 0, the sound went up
and up and up to the point where I think the frequency is just so high
that I can't hear it. The more positive volts I put on the zero
trimmer, the lower the tone gets. I have checked for the obvious.. no
obvious soldering mistakes, polarity and components are all correct..
I have to admit, I haven't checked the value of every resistor, but I
am very careful when populating the PCB.
when the 0 trimmer had about 7 volts on ic1 pin7 I checked the FM and
v/o inputs, and they did work
Any ideas where I should start looking for the problem?
thanks. again, and again...
Scott