Signal Injector (CB1385E )

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Published: Monday, 09 March 2020 12:46

Written by Newton C. Braga

   This traditional signal injector from a 1970s publication uses germanium transistors. We can mount it with silicon transistors like the BC558 and it will run with voltage power between 1.5 and 9 V. The output is a rectangular signal whose frequency depends on the capacitors.