2N4988 and 2N4989 (IP058E)

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

JFET Sample and Hold (CB5955E)
The operational amplifier is old. The circuit is from an 80's documentation but can be designed...
Voltage Comparator LM3900 (CB5048E)
The connection of high-value input resistors causes the circuit to behave like a conventional...
AFSK Tone Generator (CB4201E)
We find this encoding circuit in an American 1980s amateur radio documentation. The circuit can be...