The original application of this 1967 Ferranti circuit can be changed so that it functions as a pass sensor shield for gears and other moving objects.
Found in an Electronic Design from the 90s, this circuit makes use of integrated regulators of the time....
We found this circuit in Mullard's 1960s transistor manual. The circuit oscillates at 800 Hz, the...
In fact, the 556 consists of a double 555, which can be replaced by these integrated ones. The...