This super regenerative detector circuit was found in an English documentation from 1963. The coil is frequency compliant. The transistors are germanium of the time.
This circuit shows how to use an LED as a photodiode controlling a signaling LED. As the LEDs can...
This circuit was obtained in a 1969 Mullard manual. The transistors are from that time. The input...
This alarm does not interrupt its operation when the power is cut. A battery is kept at a constant...