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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Resistance Multiplier (CB21114E)
This circuit multiplies the input resistance of an operational amplifier. As the indicated...
MOSFET Power Stage (CB980E)
This circuit provides a good audio power from a signal at least 1 V of amplitude. The MOSFET must...
Magnetic field meter (CB7061E)
This sophisticated circuit using a liquid crystal display was found in Radio Electronics from the...