Severe vero/debugging issue

[Zben3129]

Hi all,

Today i build the torchy layout of the ts808 on veroboard. Problem is, it does absolutely nothing to the signal. I can pull the battery, take out the ic, any socketed components, turn all pots any which way, and none of this affects signal. Also, it should be notet that im not using any kind of bypass, so the switch is not the problem. Also, im using the 0v (ground) directly into the board and a mono input jack so that is not it either. Im thinking a short between input and output very early, as taking out the op amp still lets normal sound pass through??? Any help would be great!

[PerroGrande]

Short the input and post the voltages on the opamp pins...

[MartyMart]

I've built a couple from this layout, check the following :
There are 21 trace "cuts" on the copper side, make sure they are all there/correct and that not even a "hair"
of copper is left, or your connections are screwed !! ( small magnifying glass recommended for vero work )

Get the layout up against the 808 schem and check every connection is right and parts are correct values, mark
the schem with a highlighter as each "node" checks out.

Orientation of IC/Transistors and all parts with +/- connections, check the pinout of the transistor YOU are using
and don't presume that it's C-B-E or whatever, until you find out from the data sheet !

IC getting hot ? Pull the power right away to save it and a possible burt finger ! - you have a short from +9 to ground.

After all that, post up some voltages if it's still a "non worker"
MM.

[Zben3129]

my multimeter is on vacation right now    but could i check for continuity with a piexo buzzer somehow?

[frankclarke]

I usually take a dremel cuttoff tool and run it between the tracks to avoid short circuits.

[Zben3129]

something like this



2 dots as probes

[PerroGrande]

Yeah -- something like that would work.  I might recommend a series resistor to limit the current that flows through the circuit, just in case.

You could also rig up a continuity test with a series resistor and an LED -- but it isn't quite as loud

[Zben3129]

I have found a small solder bridge from the very first component off input to the wiper of the drive pot, could this cause the circuit to be unaffected by the opamp or anything else for that matter?

[PerroGrande]

Probably so.  I'm still looking up the schematic and layout you used, but in most TS variants, the wiper of the drive potentiometer controls the feedback loop in the op amp.  A solder bridge as you described would all but take it out of the loop.

[Zben3129]

www.indyguitarist.com/torchy

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