This circuit is one of many that the reader can find in this section for testing crystals. The circuit uses an indicator LED. Transistor Q1 determines the maximum crystal frequency that can be tested.
This circuit is used in the analog part of the telephone lines. The same circuit can directly...
In this project, from a Japanese magazine of 1973, only one channel of a stereo amplifier of 20 W...
Molex Sealed Industrial USB Solutions achieve superior signal integrity in harsh factory and...