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 obtained from a 90s Radio Electronics. The integrated circuit used HAA11508 is not...
This article was written by A. Fanzeres in the 1970s. We kept the original text. With the circuit we...
We found this circuit in an English publication in 1991. The circuit can be assembled with...