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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Seq Switch - adjacent gates firing
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oozitron



Joined: Apr 02, 2007
Posts: 35
Location: USA

PostPosted: Fri Nov 12, 2010 10:04 pm    Post subject: Seq Switch - adjacent gates firing Reply with quote  Mark this post and the followings unread

I have a Seq Switch wired up as a basic sequencer; a CV pot and Gate Out jack for each stage.

When I plug into Gate Out jacks 1, 2, 3, 5, 6, or 7, the expected gate occurs.

But if I plug into Gate Out jack 4, I get a gate on step 3 & 4. If I plug into Gate Out jack 8, I get a gate on step 7 & 8.

Any ideas?
Drew
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andrewF



Joined: Dec 29, 2006
Posts: 1174
Location: australia
Audio files: 4

PostPosted: Sat Nov 13, 2010 9:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

what an interesting problem Surprised

are the gate signals (3 & 4, 7 & 8 ) the same voltage, when they are both on?

(just thinking out loud) You would expect the problem to be downstream of the 4051 chip that controls the gates & LEDs. But outputs 3&4 are not physically close to each and the subcircuits for these outputs are on separate sides of the PCB, so its unlikely to be a solder bridge. The only place they are close is (presumably) on the panel, so that may be a good place to start looking.
Probably comes down to check wiring, soldering and transistor pin placement.....usual errors we all like to do.
are the 4051 chips socketed? Try swapping them and see if the problem persists.
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