Band Switch (CB21254E)

This switch or band selector for receivers was found in a Popular Electronics from the 1990s. The circuit uses a PIN diode.

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5 mA Constant Current Source (CB25615E)
This constant current circuit was found in the October 1993 Electronics Now magazine. The current can...
Test circuit for transistors as oscillators (CB3915E)
This circuit checks the oscillation capacity of a transistor. The circuit can be used with fixed...
Temperature controller using SCR (CB9472E)
This circuit was obtained in a General Electric documentation from the 90's. The circuit consists of a...