[sdiy] Speaking of OTAs/Matched Pairs????

[The Old Crow]

On Tue, 13 Mar 2001, Jim Patchell wrote:

>     To match individual transistors, you need to build a transistor
> matching circuit.  This is the one I did:
> 
> http://www.oldcrows.net/~patchell/matcher/matcher.html
> 
>     Somewhere on the internet there is the Bob Moog Circuit.

  Please note the Bob Moog circuit as published has a missing resistor.
Things will fry if the circuit is powered up without adding the resistor;
see my corrected version of the schematic:

http://www.oldcrows.net/~oldcrow/synth/misc/matching.gif

  The missing resistor was the 10K from the 2N3906 collector to the test
socket on the PNP half of the schematic.

Crow

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