High impedance stage (CB20564E)

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

Rectangular Signal Generator (CB3954E)
In the figure we have a good rectangular signals generator with several frequency bands. The...
Proximity Sensor 1 (CB5036E)
This interesting circuit was obtained from a Poptronics of February 2001. The American magazine no...
TPL577x Series of GaAIAs and Photo-Integrated Infrared LEDs
The Toshiba TLP577x series consists of an infrared photo-emitter (IR) and a sensor integrated circuit...