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Old 17th October 2002, 09:06 AM   #11
yeti is offline yeti  Germany
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Join Date: Nov 2001
Location: Ewersbach
Default pot

What I meant was from input hot to ground, this will pull down the interferences.
Usually the output of your source device is in the range of a few ohms to aprox. 100 - 470 ohms, so the voltage loss will not be too much.

Arne
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Old 16th November 2002, 03:51 AM   #12
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Join Date: Mar 2002
Location: Toronto, Canada
Default Success!

Arne,

Well, it only took me a month to get around to soldering in a couple of resistors, but I finally put an 18k (it's what I had) resistor across each input to ground tonight, and it worked The passive preamp is absolutely silent! Even at maximum volume, with my ear against the speaker, I don't hear anything. Thanks very much for the helpful tip.

Now my only problem is that this pre was built for my cousin, who is coming tomorrow to collect it. But it sounds more transparent than my DIY active pre based on the BB OPA627BP opamp And I'm using cheap metal film resistors and a Radio Shack volume control.

For anyone wanting to build a passive preamp, I highly recommend HH's design with Arne's mod of the input resistor across ground. Resistor values are not critical, I used a 100k pot, an 18k resistor across input, and somewhere around 20k for the series resistor.

Cheers,
Rons
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