96RAF Posted March 9, 2016 Author Share Posted March 9, 2016 Heres a link to a spec sheet Chris but its a high amp lo on resistance switch so it shouldn't throttle the circuit.mosfet specsheet Link to comment Share on other sites More sharing options...
Chrissaf Posted March 9, 2016 Share Posted March 9, 2016 Broken link Rob,Here is a repaired version mosfet specsheet Link to comment Share on other sites More sharing options...
Nick_ Posted March 9, 2016 Share Posted March 9, 2016 @ allThe Peco motors must be low resistance as well. I have a couple so could meter them tomorrow for comparison, but if low resistance means high current broadly speaking then I'm as clueless as everyone else as to why an R8247 struggles but Nicks kit doesn't on a fraction of the horsepower unless his is running higher voltage of course, kind of nitrous oxide - overclocking points decoder scenario. The pucka voltage regulator must be looking after the PIC.Both tests were done using my eLink with a 4A power supply, so identical power supply and identical wiring thus giving a like for like test. With all those extra capacitors I can't understand why the R8247 doesn't blow the ADS-2fx out of the water either... Link to comment Share on other sites More sharing options...
Nick_ Posted March 9, 2016 Share Posted March 9, 2016 My comment has just been blocked by the profanity filter - no idea which word it didn't like. Hopefully Adam will sort it out in the morning Link to comment Share on other sites More sharing options...
96RAF Posted March 10, 2016 Author Share Posted March 10, 2016 @nickGiven the resistance values I measured and noting the Peco motor lies midway twixt the two Hornby ones I can't work it out either. Link to comment Share on other sites More sharing options...
Fishmanoz Posted March 10, 2016 Share Posted March 10, 2016 I think you are forgetting about inductance again. You have to look at the entire tuned circuit formed by the solenoid, stray resistance, CDU capacitor and any switching components to find out exactly what voltage and current is generated. Back to the calculus I'm afraid. Much simpler to just do the empirical thing and test which ones work and which ones don't, as has already been done here. Link to comment Share on other sites More sharing options...
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