This oscillator uses a small IF transformer taken from an old transistor radio. FET admits equivalents. The circuit can be used to calibrate radios.
This simple AM transmitter for very small ranges uses in the original version of the 1970s, a...
This circuit was obtained in a 1976 English magazine, and can be assembled with equivalent...
This circuit is from a 2001 publication. The balun transformers are of the commercial type for TV...