EM Drive Problem (solved)

[rocket88]

Just built the EM drive, and put it into a 1590a box. It's my first 1590a build and I got something odd that I can't figure out.

When the pedal is engaged I get nothing but static, but I can control the volume. I checked continuity, and noticed that when the pedal is engaged there is no connection between input and output. But, by mistake I touched the box while testing continuity of the output and I got continuity, so it seems that the output jack is grounding. I've checked all the wiring, and board and can't find anything wrong. I'm going to make an audio-probe to further check, but not sure what to look for with it.

Everything is wired as it says, the only thing I did a little differently then normal was run the volume to ground directly to the switch as opposed to the output jack. Also, I used Marks offboard layout, as I always do.

Any ideas where or how this is happening?

[boratto]

Does the 3dpt stomp is ok? Test it with a multimeter. I remember two similar behavior, one 3dpdt was fucked, and the other was a cold soldering, needed to solder it again.

[rocket88]

boratto, what do you mean does the switch stomp ok? if you mean does it engage, then yes it seems to. i'm going to redo the wiring tomorrow, as i might have fucked up my wiring somehow. I ended up building a new board and wired it in, and i have the same exact problem. can not believe a circuit this small is driving me nuts now.

my last two builds have given me grief after nothing but success for over 20 pedals. but it happens.

[boratto]

experiment with another 3dpdt. I have problems with one these days, there was no signal through one of the lugs when engaged. I lost a lot of time looking for problems on the circuit, and the problem was the 3dpdt.

[induction]

Try remelting the solder on your input wire at both ends (input jack and stomp switch). Those connections don't look kosher.

[rocket88]

i will give that a try and see what happens before rewiring the whole thing.

[rocket88]

Thanks guys for the help, I really appreciate it.. the transistor was in correctly, but I did find the mistake. I kept thinking there was something wrong with my grounding, so I traced the whole grounding setup and found the problem. I'm embarrassed to say, but I screwed up the dc jack wiring. I had the ground attached to the positive lead, which would have been used by the battery if there was one. I totally feel like such a noob, but it happens.