Found in a 1960s RCA documentation, this circuit applies to most common triacs. The trigger device is a neon lamp and the sensor is an LDR. R is typically 100k and C is 220 nF.
This circuit was found in a 1974 Ferranti transistor manual. The frequency is given by the...
This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old...
This mains-synchronized circuit produces a simple 1 pulse per second. The circuit is from a Radio...