2N4987 and 2N4990 (IP057E)

Unilateral switch (SUS) with 8 V of trigger voltage. This component is used to control SCRs and other applications.

Preamplifier and Equalizer (CB18860E)
This circuit is from a 1968 publication. It uses germanium transistors from the time, having...
The Transistor as Switch (CB922E)
This circuit can be used as shield or to drive powerful loads from low current switches such as...
CBS Columbia TR 260 Radio (CB18446E)
This is a 6-transistor transistor receiver manufactured in the 60s. The circuit is a...