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Regency M100


The Regency Touch M100 is is a vintage scanner, and as it is a pre-SMD scanner, it's not a big deal to add a discriminator output.

The discriminator IC is an unknown 18 pin DIL IC. It is stamped 'Regency 600-565'.

Regency Touch M100

Using an oscilloscope, pin 10 of this IC appears to contain the unfiltered baseband signal. A solder point next to pin 10 appears to be connected directly to the IC. A 10 k resistor is soldered to TP5. The resistor can be mounted vertically.

Because the discriminator output contains a slight IF component at 455 kHz, the other lead of the resistor is connected to a grounded 2.2 n capacitor. This creates a simple RC lowpass filter with a cutoff frequency of about 7 kHz. The IF signal is suppressed effectively. The ground lead of the capacitor can be connected to the shield of the IF coil nearby.



Pin 10 of the IC contains the unfiltered audio

Simple RC filter with shielded wire

A piece of shielded wire connects the discriminator output to a 3.5 mm chassis terminal in the back of the scanner. The core of the wire is connected to the junction of the resistor and capacitor. The braid is connected to the metal shield of the IF coil.

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