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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
ways to elilminate bleed-through?
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NOISEBOB



Joined: Oct 13, 2019
Posts: 31
Location: NOISE

PostPosted: Tue Jun 01, 2021 12:08 pm    Post subject: ways to elilminate bleed-through? Reply with quote  Mark this post and the followings unread

i've been fixing up my modular, made a nice case for it and am only putting in modules that actually work well - yes, before i'd just throw in some half-arsed crap modules and hoped for the best

but i do have one that bleeds through a lot!

i havn't tried running it off a separate power supply, maybe that could fix it?


my other modules don't bleed through at all in the same degree and this one was made in the same style (quick and dirty), so i have a feeling i'm missing something.

is there a quick and easy way to eliminate bleed-through?

the module in question is made of 6 (40106) oscillators through a (4070) XOR, but the direction of what goes where is managed by a (4053) multiplexer and external oscillators. it's pretty wild.

i did put in decoupling caps (but maybe not enough?)..



there is of course also the possibility that i wired it completely wrong in the first place, ha ha.

Very Happy
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Steveg



Joined: Apr 23, 2015
Posts: 155
Location: Perth, Australia

PostPosted: Tue Jun 08, 2021 7:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi NoiseBob,

We are going to need more information. It could be possible that you are overdriving the 40106 outputs (so that you are drawing more power than the de-coupling cap can cope with), it could be the way you have wired up the power supplies to the various chips (chaining one to another), it could be a fault on the ground line rather than the positive supply, there could be some capacitive or inductive cross-coupling, you could be drawing more power than your power supply can provide or some combination of the above.
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Fri Jun 11, 2021 7:04 am    Post subject: Reply with quote  Mark this post and the followings unread

what steveq said.

it can be very tricky to get rid of it but to do that you have to figure out why it is causing the beeld-through to begin with.

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NOISEBOB



Joined: Oct 13, 2019
Posts: 31
Location: NOISE

PostPosted: Tue Jun 15, 2021 1:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks.. that's exactly what i needed to hear.... Laughing
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