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Danno Gee Ray
Joined: Sep 25, 2005 Posts: 1351 Location: Telford, PA USA
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Posted: Mon Jan 14, 2008 2:41 pm Post subject:
Voltage Comparators in Synth DIY Subject description: UA710's useful? |
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Are UA710 voltage comparators useful in Synth DIY? I have a bunch of them on some boards I'm parting out. I was just wondering if they have any utilitarian purpose here. Any schematics to illustrate their use? |
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françois
Joined: Dec 23, 2006 Posts: 139 Location: Paris (France)
Audio files: 1
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Posted: Wed Jan 16, 2008 2:04 am Post subject:
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Hello,
Comparators are indeed useful, but usually you can replace them with standard opamps. This is normally not recommended because comparators are much faster and normally glitch free, but at audio rates this does not matter too much.
You can use comparators everywhere an opamp is used as such : VCO sync circuits, VCO reset (discharge) trigger, envelope generators, waveshapers... If you have some µA710s at hand, they might be really useful.
- françois |
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Danno Gee Ray
Joined: Sep 25, 2005 Posts: 1351 Location: Telford, PA USA
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Posted: Wed Jan 16, 2008 6:40 am Post subject:
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Thank you. Does anyone have any schematics for examples? |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Jan 16, 2008 7:27 am Post subject:
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Wasn't there a thread about this just a couple of weeks ago? This chip has "special" PS requirements: +14 / -7 V max. You would probably be better with the LM311.
Ian |
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robthefiddler
Joined: Nov 10, 2006 Posts: 16 Location: Dallas, Tx
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Posted: Wed Jan 16, 2008 8:24 pm Post subject:
A project with Comparators 339s to be exact Subject description: follow up to synth circuits using comparators |
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Here is a link to an experiment I did using the 339. The basic idea is the same as the light bar circuit that comparators are so good for. I was going for a way to quantize a pots value (with lots of blinky lights). A good example of this would be a synth that uses a knob to switch between a square, triangle or sine wave.
http://www.robthefiddler.com/electronics-audio-diy/circuit-experiments/using-the-lm339-to-make-a-discrete-selector/
What I ultimately ended up with was something a bit different. Its a noisemaker with a "Mode" knob. Each mode tweaks the signal a bit more.
The comparators are still more used in the control of the signal and not the actual generation. Videos and samples are available.
Still, If I were to try and use this idea again, I would be better of with a PIC as it would be easier to make the modes exclusive in selection as opposed to progressive. (a, b, c) versus (a, ab, abc)...if that makes sense.
Comparators are also great for PWM. _________________ www.robthefiddler.net |
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