The operational amplifier used in this circuit is uncommon nowadays. We obtained this circuit from documentation from the 1980s, but it can be adapted to use more modern equivalents.
We found this high gain circuit with the LM381 preamplifier in a Radio Electronics from February 1990....
We can produce pulses controlled through this circuit that can function as a shield if powered by a...
If mounted with SMD components, this transmitter will be so small that it can be installed inside a...