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Old 25th January 2013, 05:55 PM   #11
routhun is offline routhun  United States
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Join Date: Mar 2005
Location: Sunnyvale
Hi JMFahey,

Sorry my mistake, its HAL OPB not HALOpB. Anyway here is the link to it.

HAL OPB amplifier

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Old 25th January 2013, 11:52 PM   #12
CraigP is offline CraigP  United States
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Join Date: Apr 2012
Location: Pittsburgh, PA
Originally Posted by Fast Eddie D View Post
Yeah Craig, that's a terrible circuit for audio. It might be appropriate for a DC servo buffer.

Try an LM1875 chip. It's simple and you can build a circuit with a bare minimum of components. You can experiment with tweaking it too without getting too deep. You can use single or dual supply. A google search will yield hundreds of circuits. You might be surprised with the results.
Thanks for the info. Can anyone assist with understanding the data sheets for some of these amps? Based on the data sheet from my sound card what input sensitivity should the amp have? I see values like 300mv @ 150k ohm, 100mv @ 20k ohm and 75mv @ 20k ohm.

Any tips would be great! Lots of circuits to choose from. I just want to pick the correct one.

Thanks all!
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Old 26th January 2013, 12:24 AM   #13
JMFahey is online now JMFahey  Argentina
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Location: Buenos Aires - Argentina
Just build the cicuit suggested in the chip amp datasheet (or buy a kit) and use a volume control in its input, so you set it where you like it best.
Any value from 2x10K to 2x100K will do.
Audio or Logarithmic taper (curve) is best but if unavailable, a Linear curve will do.
Anyway you will adjust it once to some useful level and then control volume from your Soundcard.
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