Balanced Modulator MC1594 (CB14588E)

This circuit is from the Motorola Linear Databook from 1990. The integrated circuit used is uncommon today.

FET photo control (CB8269E)
This circuit is from a 1966 American documentation. The circuit uses a photo-FET, an unusual...
Transistor RIAA Preamplifier (CB1372E)
We found this circuit in documentation from the 1970s; The circuit uses Japanese transistors of...
Driving a 7-Segment Display - 4026 (CB177)
The 4028 CMOS IC not only contains the complete decade counter, but also the 7-segment decoder...