Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the capacitors used. The circuit is from a Radio Electronics from December 1989.
Found in an EDN from the 80's, this circuit makes use of an operational one of the time. The...
This circuit was found in a 1962 publication. At the time there were high voltage batteries like the...
This circuit was found in a Motorola Manual of 1965. The circuit has neon lamps as trigger...