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.

12-bit DA converter (CB9331E)
We found this circuit in documentation from Analog Devices from the 90s. The components are from...
Bicycle Direction Indicator (CB10670E)
This circuit came out in a publication called Electronics Handbook of 1993. The circuit triggers an...
Blocking Oscillator (CB25644E)
This circuit was found in the December 1993 issue of Electronics Now. With the components shown the...