This FM receiver tuning step circuit was found in a 1960 documentation. No information about the coils is given, but the FI used at the time was 10.8 MHz.
This oscillator for receiving SSB signals is intended for receivers with IF of 455 kHz. The...
This circuit triggers on a relay after a time delay adjusted by P1. The range of times achieved by...
Using a period sensor, this circuit triggers a relay when pressure changes occur. The circuit is...