Simple Circuit Detects Current Pulses:
01/06/94 EDN-Design Ideas / The pulse detector
provides a visible indication of positive and
negative current pulses. The pulses amplitudes can
vary from20 to150 mA. The pulses durations can range
from10 to40 msec, and their repetition rate can
span40 to180 pulses/minute.
This idea presents a simple circuit for a superhet
radio receiver that can be built up in sections,
with each section tested before assembly. The
receiver circuitry as presented here can be built
for less than $50.