FET simple mixer (CB8760E)

We found this simple mixer in a 90s Radio Electronics. The used FETs are still common. The inputs are high impedance.

Touch Activated Motor II (CB1548E)
The simple touch of the fingers on a sensor causes this circuit to drive a motor that goes into...
Gas Analyzer (CB6366E)
This simple circuit found in an American 80's documentation simply blames if there are toxic gases in...
72W Amplifier (CB4015E)
This circuit is from Motorola's 1990 Linear Databook. The transistors allow equivalents and the...