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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Best emitter / source / cathode follower topology
Best emitter / source / cathode follower topology
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Old 2nd November 2007, 11:57 AM   #21
Alex M is offline Alex M  Europe
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Join Date: Apr 2001
Location: Hampshire, UK
Quote:
Originally posted by borges
That looks like a nice place to start! However, I would probably drop the passive filter and opamp after the follower. Do you know if the follower itself has the ability to drive a line output?
Borge
I am intending to use only the "SLCF" part of the circuit on Pedja's site, as I think the filter was found necessary for the amplifier chip.

The output impedance of a simple source follower is is approximately 1/gm, or about 40 ohms for a2SK170, which is pretty low in this context .

Alex
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