This circuit is from a 1974 publication by Motorola. The unijunction may be 2N2646 and bipolar BC558 and BC548. The pulse duration depends on the capacitor.
This circuit mutes a system when a phone call is received. The circuit is from a Radio Electronics from...
This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit has an...
The integrated circuit used in this project is not common today, as it was obtained in the Linear...