NEScaf audio filter
A switched capacitive audio filter Kit
The New England
QRP Club NEScaf is a switched capacitive audio filter kit. It has two
panel.mounted controls: a singlecenter-detent potentiometer that sets
the center frequency of the filter's bandpass (default value settable
between abouth 415 Hz and 1 KHz), and a dual-ganged potentiometer that
provides a continously variable bandwithcontrol (from abouth 60 Hz to
1500 Hz).
STAGE 1
POWER SUPPLY
STAGE 2
AUDIO AMPLIFIER
STAGE 3
CLOCK GENERATOR
STAGE 4
THE SCAF FILTER
STAGE 5
THE NESCAF INTO MY TEKO ENCLOSURE
