Microphone preamp (CB22043E)

This preamp was found in an old English publication. Any usage JFET can be employed. The output is high impedance.

Electronic Thermometer (CB19604E)
The sensor of this circuit is a thermistor of the same value as the adjustment circuit formed by...
Balanced modulator (CB7927E)
We found this circuit in a 1968 Hughes publication. The components are from the era and can be...
Voltage Reference (CB15745E)
This circuit is suggested by Motorola and consists of a voltage reference based on an MC1403. The...