Tuesday, September 8, 2020

Earbud amp using transistors from GE computer boards

I plucked some GE and TI 1960's era germanium transistors from an old computer board. This project will provide a use for 3 of them. I laid it out in a modular form so I can make adjustment to biasing by simply clipping in different resistors. If time permits this build will begin later in the day. First step is locate or build a box for it.

Basically I will lay out the transformers and transistors then add the bias resistors. Simple enough? Time will tell.

I will be using transistors manufactured for IBM by TI using the IBM assembly line. The data in the sim is based on "similar" transistors. Time for the build after I do my outside chores.

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