This timer was found in Japanese documentation from the 1960s. The transistor can be replaced by an equivalent and the relay must be of the sensitive type with voltage according to the power supply.
Found in Mullard's 1960s transistor manual, this circuit has components that depend on the...
In the figure we present an interesting application suggested by Microchip (www.microchip.com) in which the voltage...
We found this circuit in November 1983 Radio Electronics magazine. The circuit drives an LED and...