[AMPS] Blown TL922A... What to do?

Bill Fuqua wlfuqu00@pop.uky.edu
Tue, 12 Sep 2000 21:07:18 -0400

     I like the idea of modeling the circuit. However,
much of the circuit is not considered. People often don't realize that
that there are additional inductances due to the current paths thru the
chassis and often these impedances are in both the input and
output circuits.  I have seen many amplifiers that have very long paths 
from the
anode (PLATE) thru the coupling capacitor, PI input capacitor, to chassis and
back to the grid and cathode circuit. Sometimes this path is a foot in 
length or
. This single loop amounts to nearly a uH of inductance with
who knows what other impedances tied to it and signals sharing the
    My electronics instructor used to say often the problems with a circuit
is the component you can't see. Especially with RF circuits.

Bill wa4lav

William L. Fuqua  III , P.E.  EE
Department of Physics and Astronomy
CP 177 Chemistry Physics Building
University of KY
Lexington, KY 40506-0055
Phone 859 257-4155

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