Help needed amz 2 channel splitter

Started by thomasolsen84, November 04, 2018, 10:03:28 PM

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thomasolsen84

Hi. Sorry for newbie question. I built an amz 2 channel splitter. Cant get any sounds out if it. How is it supposed to be wired?
I tried to connect each of the output jacks to two amps. But dont get any sounds. Also i swapped the jfets to mpf102. Getting about 9v on both G, S and D on both jfets. Anyone care to help? Tried to google but to no luck. Adding a picture of the layout and my build




thermionix

Everything that I can see looks correct.  If all JFET pins have the same voltage, that suggests shorts.  Since they're socketed, easy to pull them out and check them with a meter.  If the JFETs themselves aren't shorted, check between the socket pins while they're pulled.  Are you sure the black sticky stuff under the board isn't conductive?

PRR

> If all JFET pins have the same voltage, that suggests shorts.

Or no 0V ground at all.
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thermionix

Quote from: PRR on November 04, 2018, 11:25:03 PM
> If all JFET pins have the same voltage, that suggests shorts.

Or no 0V ground at all.

Yeah I guess that might be more likely.  We can see the wire is there, but that doesn't mean it's fully connected properly.

thomasolsen84

I pulled the jfets. Im getting 9, 33v from power input.
Measuring at the first jfet getting 0v at S and 9.33v at G and 9.27v at D. Measuring the second jfet getting 0v at S and 9.33v at G and 9.27v at D adding some more pictures. Thanks for helping me. :)




patrick398

Row 3 and 4 on the left, almost certainly a short there, no?

thomasolsen84

Thats it a short between row 3 and 4. Well spotted. :) Thanks a lot. Been great help once again. I hope to contribute to the forum like you guys are doing. I really appreciate everyones help.  :)

anotherjim

As a tip, I use a small wire brush. Like a big toothbrush but I think it was made to help cleaning auto spark plug gaps. I just scrub the finished board and it clears the track gaps quite well. Always visually inspect also.

patrick398

Scoring in between tracks with a scalpel or very small flat tip screwdriver is also a good idea for budging bridges. The ones you can see are fine, it's the microscopic bastards that'll get you.
I use a regular toothbrush too once i've been over the board with a scalpel but i reckon Jim's way is a nice 2 in 1 option