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Ajax
Joined: Apr 05, 2010 Posts: 63 Location: San Francisco
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Posted: Wed May 26, 2010 10:12 pm Post subject:
Output Modules Subject description: components to use |
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Alrighty then. I've got the ideas with the oscillators and will have plenty of fun to come with those But it's time to get some real sound going out in something of a consistent manner. So, I want to build a mixer-esque module.
So what's everybody's output module look like? (assuming you go modular, if not, you got the idea) Right now, I'm thinking input banana plugs, send those through either diodes or 100Ks, to an opamp, to the output.
Any problems with that, or things I absolutely need in there? And how's the LM386 for these kinda things?
Thanks all! |
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Inventor
Stream Operator
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 267
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Posted: Thu May 27, 2010 12:21 am Post subject:
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Ajax, I use a voltage follower with a capacitor and a 1kOhm resistor on it's output to the output jack. This is suitable for driving into a computer's line in jack or into headphones. You can use various circuits for volume control as well, including a 100kOhm pot on the input of the voltage follower, especially since Lunetta signals are typically 9V peak to peak. The cap on the output can be 0.1uF ceramic or a larger electrolytic with the + on the opamp's output and the - to the output resistor.
LM386 audio amps are typically for driving low impedance speakers and are therefore not suitable for driving into a computer or other high impedance input. I'm sure there are many ways to do this, that's just what I do. Good luck with your projects.
Les _________________ "Let's make noise for peace." - Kijjaz |
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Ajax
Joined: Apr 05, 2010 Posts: 63 Location: San Francisco
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Posted: Thu May 27, 2010 8:31 am Post subject:
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Ah, I see. Many thanks! |
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Top Top
Joined: Feb 02, 2010 Posts: 266 Location: California
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Posted: Fri May 28, 2010 3:02 pm Post subject:
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On the device I just built (all cmos), I had my filter as the last thing then into a .1uF cap and a voltage divider volume pot, but I have also just fed through resistors and a .1uF cap (blocks DC). Smaller cap values will filter out more bass... so watch out for that.
I have found that driving headphones straight from cmos doesn't sound so great - it doesn't drive a low impedance output so well - very thin sounding, so an LM386 could be good for a headphone amp if you wanted one - personally I just plug into a mixer or amp and get headphones from there if needed. |
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