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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Found an interesting little noise circuit
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CHRISKELLY



Joined: Apr 08, 2018
Posts: 81
Location: England
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PostPosted: Mon Jan 28, 2019 1:49 pm    Post subject: Found an interesting little noise circuit Reply with quote  Mark this post and the followings unread

https://youtu.be/grVCbj-C6Z8

Stumbled upon this video where someone has built a noise generator from 2 CMOS chips. Runs on 12V single supply.

What I liked was the odd inteference he creates by moving his hand near a 330k resistor.

I thought you guys might like it Very Happy
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richardc64



Joined: Jun 01, 2006
Posts: 669
Location: NYC
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PostPosted: Tue Jan 29, 2019 10:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cool find.

The slowed rise of +V ensures the shift register never starts up stuck at all 0s or all 1s. The cap at the clock input slows the rise and fall of the clock, making the clocking itself somewhat random. Clever.

Although the schema shows +12V, it looks like the guy was using four AAs to power the thing. Because the chips are cmos, it should work at as little as 3V.

Thanks.

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CHRISKELLY



Joined: Apr 08, 2018
Posts: 81
Location: England
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PostPosted: Wed Jan 30, 2019 9:12 am    Post subject: Reply with quote  Mark this post and the followings unread

If it will run OK at 9v then i might give it a try.

I was thinking you could mount the 330k resistor on your Lunetta somewhere and use your hand to create the random inteference while playing. Kind of like a "noise theremin" as someone said in the comments Smile
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