This transmitter for the 40 meter or 7 MHz band was found in a magazine 73 for radio amateurs of the 90s. The circuit has a power of ½ W.
Great sensitivity for the circuit can be obtained with a Darlington amplification step for the...
Found in a 90s Silicon Chip documentation this circuit is intended to protect a speaker system in...
This circuit was found in a Japanese publication from the 1960s. It uses germanium transistors and is powered...