Low noise mixer (CB7984E)

This mixer was found in Silicon Chip documentation from the 90's. The circuit uses integrated circuits from that time.

Signal follower (CB9983E)
This simple audio signal tracer or follower can be made with a BC548 instead of the original...
PWM controller with high-side Drivers (CB12518E)
The circuit shown in figure 1 is a suggested application for ISL8107, a new integrated circuit from...
High Q Notch Filter (CB4834E)
This notch filter or reject filter rejects signals of a certain frequency with good selectivity. The...