Multi pellet diode regulator (CB8798E)

The used diode is an unusual component today. We found this 12 V regulator in documentation from the 90s.

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Active inductor (CB20748E)
This circuit simulates an inductor. Or operational amplifier of old type, but a configuration is...
Voltage reference with FET (CB21534E)
We found this circuit in a 1967 Electronic Design. The circuit uses contemporary transistors that...
Relay Control shield or interface (CB15483E)
To control relays safely with double insulation, we suggest the circuit in the figure. The optical...