This commercial signal follower was found in a 1967 Japanese magazine. It uses germanium transistors and provides a speaker output without the need for a transformer.
This circuit provides a pulse train of 4 MHz or at another frequency determined by the crystal during...
This circuit was obtained in the manual of the used integrated circuit. Equivalents may be used...
ST Microelectronics has, in its line of low voltage drop linear regulators, the KD1084xx (fixed) and...