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What controller were you using at the time?

The ones made by the now deceased ZTC occcasionally blew decoders on switching off or on switching on the mains power to teh transformer unless you put a DPST switch between the controller and track and turned the switch off before you turned the controller off at the mains. Likewise after switching the power on to the transformer you were supposed to leave the DPST switch in the off position for about 5 seconds and then turn it on to power up the track. This was because the ZTC design didn't incorporate relays to do the delayed track switching itself unlike most other DCC controllers, and any voltage spiking resulting from turning the mains power on and off resulted in the voltage in the track instantaneously being too high, which could be enough to blow a decoder, I speak from experience, it took out 2 functions on a Lenz 6 function chip..

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