PC address decoder (CB20536E)

This TTL decoder circuit for PC ports was found in a document from 1992. The power supply can be PC's own circuit.

JFET Preamplfier (MSB046E)
The preamplifier using JFET presets a high input impedance and very low distortion. The input...
Test Circuit for Transistor (MSB070E)
In this simulation we show how to implement a test circuit for BJT transistores. In the simulation we show a...
500 ohms Audio Amplifier (CB13668E)
We found this audio amplifier stage with 500 ohms of input impedance in an old American...