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.
We present a DC-DC converter circuit that can operate with input voltages from 2.4 V to 14 V and...
We found this circuit in a 1977 Radio Shack brochure. Transistors can be the most modern BC548 for NPN...
This circuit can be used as an input shield for microcontrollers or other TTL circuits. The power...