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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Output Modules
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Ajax



Joined: Apr 05, 2010
Posts: 63
Location: San Francisco

PostPosted: 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 Twisted Evil 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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Stream Operator


Joined: Oct 13, 2007
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PostPosted: Thu May 27, 2010 12:21 am    Post subject: Reply with quote  Mark this post and the followings unread

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

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Ajax



Joined: Apr 05, 2010
Posts: 63
Location: San Francisco

PostPosted: Thu May 27, 2010 8:31 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah, I see. Many thanks!
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Joined: Feb 02, 2010
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Location: California

PostPosted: Fri May 28, 2010 3:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

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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