Interpolating Scanner Circuit

Here are three plots from a SPICE simulation of the scanner drive circuit. All have the input control voltage on the X axis, 1 volt per division

Scanner Circuit - Multiplexer Circuit - Electronic Resource Circuits

Scanner Circuit - Multiplexer Circuit - Electronic Resource Circuits - Astable Multivibrators

Multiplexer Electronic Circuits

220 Volt Live Wire in Wall Scanner

220V live wire-in-wall scanner circuit

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Multiplexer Circuits / Scanner Circuits - Electronic Resources

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Repair Tips for Bearcat Scanner Radios

Robert Casey fixed his deaf, 16 channel Bearcat BC140 scanner. A 10 ohm resistor had opened that fed a circuit that generates 22V for the varactor diode

Low Thermal Scanner

The relay circuits are activated either by front panel. push buttons or by means of an IEEE-488 bus.

Preamplifier scanner

This circuit scan all the preamplifier entries to identify where is a audio signal

Ray's web page - Circuits

Ray’s web page Circuits

ADDING S-METERS TOO YOUR SCANNER

If your scanner is capable of this mod, it will have an AM circuit almost identical to that of the PRO-2006.