millerhillboy Posted December 28, 2016 Share Posted December 28, 2016 got a Dapol britannia which became faulty, a component between the actual motor terminals and the feed down from the PCB burnt out. Quite why I'm really not sure. There is one of these components on each of the feeds from the PCB but only one has burnt out. There is also a cluster of capacitors between the feeds which I'd guess is suppression. I'm guessing the components are diodes to protect the PCB or the chip more likely from back EMFs or something like that. Anyway, I temporarily bypassed this burnt out component as I read these are only needed for DCC applications which mines is not. However when i did this the motor still did not run when power applied at the wheel, but it did run if I touched the supply wires to the solder points feeding the motor, but not the solder points where the PCB is feed from the pickups. My question is can Ijust bypass the PCB, and hardwire the feeds from the pickup straight on the motor feeds with the suppression in place? Link to post Share on other sites More sharing options...
Stevelewis Posted December 28, 2016 Share Posted December 28, 2016 Go for it! But be careful not to use excessive voltage when running the loco. You could forget the suppression too, A friend of mine has got some N gauge locos rewired in this way, ( Mostly from the same manfr. as your Brit. As a matter of interest I have owned several Bachmann 7mm ( 0 Gauge) Brass locos, these are superbly running items , and as supplied the internal wiring consists of 2 wires form the pickups to the motor, no PCBs !! No capacitors ( suppressors) no nothin!! Link to post Share on other sites More sharing options...
millerhillboy Posted December 28, 2016 Author Share Posted December 28, 2016 Yes I figured the suppression was more or less obsolete if not entirely. I just wondered if the PCB might have offered some sort of smoothing or something. I'll give that a try then. Thanks Link to post Share on other sites More sharing options...
DCB Posted December 29, 2016 Share Posted December 29, 2016 I would simply bin the PCB and hard wire pickups to motor (making sure it was done the right way round?) and solder a big ceramic cap in parallel with the motor, if you need suppression. I guess these N gauge motors like 21 volts even less than 00 ones so maybe make sure you are using an N gauge controller. I made the mistake of trying to run 00 trains off an N gauge OnTrack controller and they barely moved and only advanced bodgery made the controller useable, so maybe the converse applies and the PCB goes pop in protest. Link to post Share on other sites More sharing options...
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