Balanced Modulator MC1556G (CB14559E)

We found this circuit in Motorola's Linear Databook in 1990. The semiconductor component used is no longer common today.

Power Operational Amplifier LM195 (CB14267E)
This circuit is suggested by National Semiconductor in its Linear Applications Handbook. It makes...
Bandpass filter (CB12695E)
A frequency range determined by the network of resistors and capacitors with negative feedback and input...
Optical Audio Link Receiver (CB13886E)
We found this circuit in a Radio Shack documentation from 1977. The circuit serves for a link of...