Medium impedance stage (CB20563E)

We found this circuit in an English publication from 1963. The circuit uses germanium transistors of the time.

Current Monitor (CB15826E)
This circuit, suggested by National Semiconductor, provides an output voltage proportional to the...
Photodiode Amplifier III (CB1302E)
Found in 1980s documentation, this amplifier uses a symmetric source and the gain is given by the...
Visible light transmitter (CB7852E)
This modulated light transmitter was found in a 90s Popular Electronics. In place of the lamp with...