Voltage reference (CB8466E)

Found in a 90s General Electric documentation, this circuit has a drain current of just 1.5 uA. The load current is 200 uA.

RF switch using diodes (CB9225E)
This circuit can switch signals in the 3.5 to 30 MHz band. We found it in a QST magazine from the...
Hearing aid amplifier (CB22355E)
We found this circuit in an English documentation from 1995. The components used are common...
RF Sniffer (CB6236E)
This is a field strength meter found in an 80's Hands On. The circuit operates at frequencies up to 500...