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 was found in the April 1968 Radio Electronics magazine. The circuit uses two FETs...
Found in an EDN from the 1980s, this circuit uses a double 555. The circuit activates a relay that...
Found in an old Popular Electronics this circuit appears in other variations on this site and in...