High impedance stage (CB20564E)

This high input impedance amplifier stage was found in a 1963 documentation. The transistor germanium of the time.

Optical Receiver (CB10502E)
I found this circuit in a Popular Electronics from 1992. The circuit shows how we can receive...
6 V x 50 mA Switching Power Supply (CB13504E)
This unit is intended for powering low consumption devices. The operating frequency is...
Digital Frequency Detector (CB13288E)
This TTL digital circuit from Texas Instruments documentation from the 1970s used the company's SN types...