I working on building the runoffgroove.com Ginger circuit and I've got it all wired up, but I'm having trouble getting it to work. Here is the schematic:
With the pedal on, I am passing a constant tone through the input jack, which measures at 1.3mVDC
I've measured the voltage at the emitter of Q5 and it reads at 4.16VDC. But once I get to the output jack, there is no voltage, as in 0VDC. I'm not super experienced and I don't really know what this means.
Let me know if you need more info.
Last Edit: Jun 29, 2017 19:21:01 GMT -5 by minions
I built a few overdrive circuits with those 2n5457 jfets. They are very good with guitars in a 9V system. Is that tbe tyoe you have?
If you are sure you have it wired up right, with the jfets cortectly connected according to the lead-outs for gate, source and drain, then the first step is to work from Q1 onwards, setting the trim pots so the drains are biased at 5 to 6 V. Once set there, youll find even just touching the gates with a finger tip will make the dc voltage move.
Then, set up a way of tracing audio. If you have nothing else, use a guitar lead plugged to a clean low volume amp and clip the barrel to the circuit ground. You should be able to hear a signal after every jfet stage so you can work from Q1 onwards.
Thanks John! Yeah this is the system I have. Sorry, I wasn't very specific at all in my last post. I found the GEOfx debug page and made an audio probe (guitar cable > one end a 1/4" mono plug, the other end with the shield soldered to an alligator clip and the hot lead soldered to a .1uF cap). I probed every point in the signal path and didn't find any problems till I got to the gate of Q3. From there on out the signal stops. I have an extra 2N5457 that I will put into the circuit tonight or tomorrow and let you know what I find.