The time of this timer depends on C1. The circuit was found in the July 1994 Electronics Now magazine. The supply voltage depends on the relay and can go up to 12 V.
This power supply makes use of a capacitance multiplier. C2 can be 100 uF which with the action of...
This circuit, which appears in other applications on this site, was taken from a 2000...
Mouser Electronics is already providing new MOSFETs EF SIHx28N60EF of Vishay series for voltages...