We found this circuit in the 1983 edition of the Electronics Experimenter handbook. The circuit uses components that are common today, although many admit equivalents.
May 2017 - Mouser Electronics already has for sale the new Littelfuse SP2555NUTG diode arrays for...
To control direct current loads, under voltages between 12 and 200 V, and currents up to 3 A, we...
The zener diode determines the triggering of the circuit and R3 must be a resistor that will be...