This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the frequency determined by R1, R2 and C1.
With the illustrated circuit we can run a DC motor in one direction or the other, depending on...
This timer for long time intervals is from the 1990 Motorola Linear Databook. The setting applies...
We found this circuit in a 1980s publication for amateur radio. It consists of an audio amplifier...