AC Voltage Gain From Just an R-C Circuit?

[JWISNIA]

You might be able to win a beer from some newbie electronicer by betting
that you can show him/her how to make a circuit with nothing but resistors
and capacitors which displays ac voltage gain (albiet over a rather narrow
range of frequencies...)

Solution....Draw a three stage R-C phase inverter (60 degrees of lag per
stage), which uses only 3 Rs and 3 Cs. It is a three terminal network with
an input, output and common. This is the kind of circuit which used to be
used as the frequency determining element in sine wave audio oscillators
back in the tube days. The output voltage will be less than 1/4 of the
input voltage at the frequency where the phase shift is 180 degrees. Now,
just invert the usual sense of the input by considering the "common"
terminal as the input, and the "input" terminal as the common. If you
compare the voltage level at the output to that at the input you'll find
the ratio is greater than unity!

Jeff Wisnia W1BSV - Winchester, MA. "Common sense isn't very
common..."

[Glen Bentley]

In article <3efn6r$c...@newsbf02.news.aol.com> jwi...@aol.com (JWISNIA) writes:
>From: jwi...@aol.com (JWISNIA)
>Subject: AC Voltage Gain From Just an R-C Circuit?
>Date: 4 Jan 1995 21:57:31 -0500

I'll bet that all C's are equal and all R's are equal too.