This circuit turns off after a time given by capacitor C1. This component can have from 1 to 1,000 uF depending on the desired time. The circuit is from an Electronics Now from June 1995.
The circuit shown simulates a programmable unijunction transistor (PUT). Transistors may be common...
This filter was found in a publication for radio amateurs in 1977. The components can be changed for...
Found in a 1977 publication this circuit is relayed from a signal carrier in a receiver....