This circuit, for vehicles with a 6 V battery, was found in the 1964 RCA transistors manual. Transistor 2N3054 can be replaced by a TIP41.
This circuit uses a triac to detect the level of a reservoir, and a sensitive SCR connected to the...
This Signetics circuit uses a double 555 (556) to generate tone bursts at frequencies determined by...
This circuit provides an extremely stable, temperature-compensated reference current. The circuit is...