This circuit with an unusual configuration was found in the January 1974 issue of Radio Electronics magazine. The frequency is given by L1/C1, and the transistors admit equivalents.
Found in the April 1978 issue of Radio Electronics magazine, this circuit is intended to be...
This circuit is found in documentation from the 1990s. The load can be a relay and the sensor, an LDR of...
This biestable can use a common comparator like the LM339 and the power depends on the load, which...