Optical sensor for PC (CB20548E)

This circuit was found in a PC documentation from 1996. It can be used as a shield with modern microcontrollers.

Inverter Amplifier LM3900 (CB4502E)
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We found...
Battery Voltage Indicator (CB4982E)
We found this circuit in an 80's schematic. The circuit uses LEDs in series with zeners to...
How to Test IGBTs (INS045E)
IGBTs are widely used in frequency inverters, power controllers, switched sources and DC/DC...