Learn how to build a DIY portable speaker using a car speaker, cardboard, and basic electronic components. This step-by-step ...
The circuit below shows a 4-transistor utility amplifier suitable for a variety of projects including receivers, intercoms, microphones, telephone pick-up coils, and general audio monitoring. The ...
Probably the most important invention of the 2oth Century was the transistor. The first point contact transistor shown below was made at Bell Laboratories. The workbench of John Bardeen and Walter ...
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