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billsship
Joined: Apr 14, 2013 Posts: 21 Location: Arkansas, USA
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Posted: Sun Sep 15, 2013 8:14 pm Post subject:
4051 woes! |
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Hello all, I'm trying to get this dang 4051 chip to manage voltages but it keeps acting like its on the fritz.
I have three momentary buttons hooked up from +9v to the A, B, and C control inputs. INHIBIT, -V, and GND pins are all tied to GND. For testing, I have a square wave from a 40106 running into channel 1. Based on the logic table (http://www.cmos4000.com/cmos/4051.html), channel 1 should be routed to the output pin when the A input is high, and B and C are low. But this isn't happening. The square wave just cuts in and out randomly, changes timbre, and cuts out for a few seconds if any of the buttons are touched.
Am I understanding the 4051 correctly? 7 individual analog signals are selected by a combination of 3 selection pins, and routed to a single output pin. Any idea what the heck is happening? Am I missing diodes? I should mention, I have about 6 months of on-off electronics experience (semi-noob). I've successfully built 40106/4093 oscillators and a few kits.
My goal is to incorporate this into my Eurorack modular to make some interesting "random" sequences. Thanks for your help and input! _________________ Vine username: "billsship"
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Cynosure
Site Admin
Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
Audio files: 82
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Posted: Sun Sep 15, 2013 9:51 pm Post subject:
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Try adding a 10k resistor to ground on the A, B and C pins. This will ensure that they stay at 0v until you set them high. _________________ JacobWatters.com |
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
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Posted: Mon Sep 16, 2013 8:19 am Post subject:
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make sure inhibit and vee are connected to ground aswell.
for some real fun feed the control inputs with audio frequency square waves and the channels with LFOs (sub-audio frequencies). _________________ As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"
Green Dungeon Alchemist Laboratories |
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billsship
Joined: Apr 14, 2013 Posts: 21 Location: Arkansas, USA
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Posted: Mon Sep 16, 2013 6:40 pm Post subject:
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It's working! I was missing those resistors and a 10uF capacitor on the output.
Thanks so much! I really appreciate all of the hard work and time you experts spend with us beginners. Respekt! _________________ Vine username: "billsship"
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Cynosure
Site Admin
Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
Audio files: 82
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Posted: Tue Sep 17, 2013 5:04 pm Post subject:
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You're welcome. I figure I have lots of help hours to make up on this forum for all the times that others have helped me _________________ JacobWatters.com |
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billsship
Joined: Apr 14, 2013 Posts: 21 Location: Arkansas, USA
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Posted: Tue Feb 11, 2014 8:19 pm Post subject:
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Hey all - I wanted to report back after making this thread last September. After many Lunetta doodles and breadboarding failures, I finally got a the 4051 / 40106 combination to work! My previous post was shortlived, it actually didn't work. THANK YOU to all the knowledge everyone brings to the website.
You can see a clip on my Vine account.
https://vine.co/v/MWE1qxpW5j5
I'm looking forward to making a 4051 multiplexer synth box for my car during long road trips. Not for me, for the passenger! _________________ Vine username: "billsship"
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