This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is given by capacitor C1 and R2 which has the range of values indicated in the diagram.
This circuit was found in a publication of1994, originally obtained from the National...
This circuit found in 1969 Popular Electronics is used to power a gas laser. The circuit produces...
Found in a Popular Electronics from the 90s, this circuit can be adapted to use LEDs. The power...