This circuit was found in a 1969 Mullard publication. The transistor may be the modern equivalent of BC548. Observe the relatively high supply voltage.
The oscillator presented uses two inverter buffers as a base and the frequency, which depends on...
We found this circuit in an old English documentation. The idea is a momentary indicator that...
General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs...