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Thanks for the information Dave. . . However: Circuitron has two products. The most interesting is $16 and offers two block detection with built in signal drivers. I searched the internet for "Signal Research" but didn't get any hits for anyting related to model railroading. <br /> <br />What I really want is a circuit diagram for just a detector, one I can build myself. I don't need the signal drivers. <br /> <br />
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