This windshield wiper timer was obtained in an 80's Hands On. The transistor can be the BC548 and the relay is 12 V sensitive. The time is set to R3.
Other operational amplifiers from the same family such as MC34002, MC35001, MC34004 and MC35004 can...
This oscillator uses germanium transistors. It was found in the Radio Electronics magazine of may...
This circuit is from a documentation on Motorola interfacing techniques from 1975. The Darlington may be...