This long interval timer was found in the September 1976 issue of Radio Electronics magazine. The output can be used to control a relay. The circuit achieves timings of up to 14 hours.
This protector was found in an Electronics Now from the 90s. The 250 V transient suppressors are common...
This circuit carries small batteries of Nicad that can be connected in series in number of up to...
This circuit was found in Motorola documentation from 1966. The lamps are according to power and...