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astroman
Joined: Sep 13, 2012 Posts: 44 Location: UK
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Posted: Wed Oct 03, 2012 6:10 am Post subject:
Connecting CMOS chips without killing them |
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Ok, whats the best way to connect cmos chips? I'm trying to modulate one 40106 from another (instead of using 2 oscillators on the same chip). I'm connecting pin 2 from the first to pin 1 of the second. Will a diode pointing to the first be adequate? Cheers in advance!!! |
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
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Posted: Wed Oct 03, 2012 7:51 am Post subject:
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I'm not really sure what you're trying to do here, circuit diagram please
If you're doing what I think you are, then it is impossible, 40106's are just inverters, you can't modulate one with another. The second oscillator in the chain will just output the inverse of the first and the cap on it's input will likely short the first to ground.
Connect the outputs of both into gates or combine the outputs via diodes for more interesting sounds. Signal heterodyning is the key _________________ 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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astroman
Joined: Sep 13, 2012 Posts: 44 Location: UK
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Posted: Wed Oct 03, 2012 8:10 am Post subject:
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Kinda answers a few other questions Joe, thanks! Geting a drawing together so I can show u what I mean |
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astroman
Joined: Sep 13, 2012 Posts: 44 Location: UK
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
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astroman
Joined: Sep 13, 2012 Posts: 44 Location: UK
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Posted: Wed Oct 03, 2012 9:24 am Post subject:
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Awesome stuff Joe!!! Many thanks again!!!!!!!!! |
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
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Posted: Wed Oct 03, 2012 9:33 am Post subject:
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Doesn't the Weird Sound Generator use one 40106 osc to modulate others in some ways? I'm pretty sure it does....
Also, I think if you have some vactrols (Electronic Goldmine had them cheap recently) I also bet you could do something there....gotta find a way to get the frequency of the one oscillator to control the brightness of the vactrol... |
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Psyingo
Joined: Jun 11, 2009 Posts: 248 Location: Canada
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Posted: Wed Oct 03, 2012 9:53 am Post subject:
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using a diode pointing towards the second inverter (oscillator) is essentially hard syncing the one to the other. heterodyning and hard sync are both useful sound modulation tools.
try making the first oscillator a very short pulse to sync the second oscillator with. |
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
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Posted: Wed Oct 03, 2012 11:42 am Post subject:
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elmegil wrote: | Doesn't the Weird Sound Generator use one 40106 osc to modulate others in some ways? I'm pretty sure it does....
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I thought it used some transistor and diode based logic circuitry to gate them? oh no wait, i think it uses a transistor similarly to the above circuit but in a less effective way. I'd need to check when not sleep deprived.
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Also, I think if you have some vactrols (Electronic Goldmine had them cheap recently) I also bet you could do something there....gotta find a way to get the frequency of the one oscillator to control the brightness of the vactrol... |
Look up the LM331 _________________ 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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PHOBoS
Joined: Jan 14, 2010 Posts: 5581 Location: Moon Base
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
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Posted: Wed Oct 03, 2012 12:07 pm Post subject:
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Ah, Joe, but I wanted to do this for the CMOS challenge
I will have to keep the F to V converter with the LM331 in my back pocket though, thank you.... |
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Psyingo
Joined: Jun 11, 2009 Posts: 248 Location: Canada
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elmegil
Joined: Mar 20, 2012 Posts: 2177 Location: Chicago
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Posted: Wed Oct 03, 2012 12:37 pm Post subject:
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Cool! I will give that a shot. |
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astroman
Joined: Sep 13, 2012 Posts: 44 Location: UK
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Posted: Wed Oct 03, 2012 12:49 pm Post subject:
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Not sure how it works but my schemo works!!!!! (see top of this thread). |
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astroman
Joined: Sep 13, 2012 Posts: 44 Location: UK
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Posted: Wed Oct 03, 2012 5:54 pm Post subject:
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So to sum up, as long as I put a 100k resistor between each chip I'll be fine? Diodes another day!!! |
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
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Posted: Thu Oct 04, 2012 3:03 am Post subject:
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The inputs of CMOS gates or other ICs are designed to be really high impedance, so a 100k resistor in series would not be necessary, however if you are connecting an output to things, follow the possible current paths around and make sure you haven't shorted it to ground or to V+. A resistor greater than 1k on the output will be enough to prevent damage by an accidental short circuit but with proper planning is should not be needed _________________ 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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astroman
Joined: Sep 13, 2012 Posts: 44 Location: UK
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Posted: Thu Oct 04, 2012 5:28 am Post subject:
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Thanks Joe.......thats given me enough confidence!!!! |
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