2N4988 and 2N4989 (IP058E)

SUS (Silicon Unilateral Switches) with a 8 V trigger voltage used in the controlo f SCRs and other applications.

Sinusoidal Generator (CB14358E)
The configuration shown is suggested by National Semiconductor in its 1994 Linear Applications Handbook....
Simple Medium Wave Radio (CB12812E)
This simple receiver, which requires a good antenna and grounding, was found in an Argentine...
Analog switch (CB21253E)
This circuit was found in an Electronic Design from the 90s. Operational amplifiers admit modern...