This circuit uses three inverters to generate a rectangular signal whose frequency depends on R1 and C1. The circuit is from a March 1996 Electronics Now.
This circuit, which provides a power of up to 3.5 W, can be supplied with voltages from 9 to 14 V....
We found this timer for times of a few minutes in a 1974 Ferranti transistor manual. The relay is 37...
This circuit can provide both positive and negative voltage outputs from 2 to 12 V with current up to...