frenchrichard Posted October 20, 2021 Share Posted October 20, 2021 Hi, I've found in one of my boxes of electronics 6 modules labelled SIG02 signalling modules plus some 2 aspect signals. The circuit is based on a 4011 quad nand gate and appears to have V+ with zener diode protection, GND, Signal IN (diode protected) plus 2 outputs. Does anyone know anything about these? Link to post Share on other sites More sharing options...
frenchrichard Posted October 20, 2021 Author Share Posted October 20, 2021 I'm answering my own question as I connected up one module and found it to be detector circuit with adjustable timer (5 to 240secs) to return signal back to green. Happy days. wonder how easy it is to modify to block working? Link to post Share on other sites More sharing options...
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