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billsship
Joined: Apr 14, 2013 Posts: 21 Location: Arkansas, USA
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trav
Joined: Sep 11, 2012 Posts: 108 Location: Auckland
Audio files: 16
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Posted: Mon Apr 15, 2013 7:32 pm Post subject:
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Welcome, billsship
1. yes, that is pretty much the golden rule for cmos, but they can be tied either high (to supply voltage) or low (ground); just don't leave them hanging! In your diagram you need to do this with pins 5, 8, and 13 (you have already tied pin 1 high). If you tie them high the oscillator will be always on with nothing plugged into the input, if you tie them low, always off. Either way, you want to use either a pull-up or pull-down resistor (say 100k between pin 5 and ground, for example) so that when something is plugged into the input that signal will control the oscillator.
2. you don't need to do this; banana jacks are fine
3. this won't work the way I think you mean. cmos are logic chips, for the most part they only understand 1 (supply voltage) and 0 (0V, or ground). Use your mixer for what you want to do.
4. you can get fancy on this, but just hanging an LED+current limiting resistor off the outputs works for me.
in summary, what you probably want is a) a resistor to ground (or to +9V) from pins 5, 8, and 13, and b) a resistor-to-LED-to-ground of each of your oscillator outputs.
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billsship
Joined: Apr 14, 2013 Posts: 21 Location: Arkansas, USA
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Posted: Mon Apr 15, 2013 8:37 pm Post subject:
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Thank you so much for your help Trav! I'll post updates when I have them. Now onto laying this thing out on stripboard. _________________ Vine username: "billsship"
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Draal
Joined: May 18, 2010 Posts: 308 Location: Oak Park, IL
Audio files: 5
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Posted: Wed Apr 17, 2013 4:43 am Post subject:
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Remember the most important rule: have fun _________________ Zontar Prevails! |
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DUBmatze
Joined: Feb 18, 2013 Posts: 150 Location: south Germaica (schwabilon)
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Posted: Sat Apr 20, 2013 8:31 am Post subject:
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Hey,
one way to connect a LED to the output is:
(check out http://www.beavisaudio.com/Projects/CMOS_Synthesizers/ )
a other way is (i use that) just buffer the Output with 2 buffer of a 4050 (one for the Audio Out and one for the LED).
Your OSC 2 -3 maybe will produce sound wile nothing connected to input . You can use jacks with a switch. Just connect the switch to ground an the input an it is LOW while nothing is connectet. |
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billsship
Joined: Apr 14, 2013 Posts: 21 Location: Arkansas, USA
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Posted: Tue Apr 23, 2013 7:27 pm Post subject:
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Thanks, Dubmatze. I've decided to go with the easier approach. I've wired up some basics on my breadboard (I'm pretty new to the actual wiring-up of circuits) and I've been pleased with the sounds!
One goal of mine is to allow these CMOS chips to interact with my Eurorack modular synth. I would like to use a 4093 to create 4 variable-speed LFOs that could be used to clock an ADSR or other module that takes triggers/gates. But I want to make sure that it doesn't fry my synth! Eurorack modules take 0 to 5v as CV/gate. If I run a 4093 circuit on 5v, would there be any issue with power issues or explosions or burning electronics?
As for using a CMOS synth as an audio source in a Eurorack synth, I've read that because these CMOS chips run with a +V and ground, there would be an audio bias or DC offset when mixed with the +12/-12V ground centered signals coming from the other modules. Is this true? Is it avoidable?
All of your (y'all's) help is so appreciated. Thank you!! _________________ Vine username: "billsship"
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