This small low current inverter operates at 20 kHz frequency. We found it in documentation from the 1980s. The integrated circuit is from that time.
This configuration has already been found in other manuals, as the LM117 is manufactured by...
This is the radio receiver for the previous infrared alarm radio transmitter. It contains the...
This circuit, from an old publication from the 70s, can be assembled with a 2N2646 unijunction...