CourthsVeil Posted September 20, 2016 Share Posted September 20, 2016 <snip> ...power units which deliver a set voltage depending on the control know setting from 0 - 14 volts. ... What, please, is a "control know" setting ??? Tx for answering Armin Link to post Share on other sites More sharing options...
RMweb Premium dhjgreen Posted September 20, 2016 RMweb Premium Share Posted September 20, 2016 What, please, is a "control know" setting ??? Tx for answering Armin Knob? Link to post Share on other sites More sharing options...
CourthsVeil Posted September 20, 2016 Share Posted September 20, 2016 The letter B so far away from W on the keyboard - unlikely to be a simple typing error ? Armin Link to post Share on other sites More sharing options...
brigo Posted September 20, 2016 Share Posted September 20, 2016 You can easily drop the voltage with a string of diodes inserted between the controller and track. Each diode will drop about 0.7 volts. Diodes 1N4001 series for 1 amp or 1N5401 series for 3 amps. Of course you will actually need 2 strings wired in opposite polarity to get forward and reverse. There is a diagram about 3/4 of the way down on this website where someone has actually used this method to lower the voltage on an individual basis within the loco to supply a sound unit. http://www.girr.org/girr/tips/tips11/usa_speeder_tips.html Brian Link to post Share on other sites More sharing options...
sharris Posted September 21, 2016 Share Posted September 21, 2016 The letter B so far away from W on the keyboard - unlikely to be a simple typing error ? Armin Predictive text error? Link to post Share on other sites More sharing options...
sharris Posted September 21, 2016 Share Posted September 21, 2016 You can easily drop the voltage with a string of diodes inserted between the controller and track. Each diode will drop about 0.7 volts. Diodes 1N4001 series for 1 amp or 1N5401 series for 3 amps. Of course you will actually need 2 strings wired in opposite polarity to get forward and reverse. There is a diagram about 3/4 of the way down on this website where someone has actually used this method to lower the voltage on an individual basis within the loco to supply a sound unit. http://www.girr.org/girr/tips/tips11/usa_speeder_tips.html Brian That might work to get the sound accessory into the right voltage range (as described in the article), but if applied to the traction circuit of a feedback controller, won't that also drop the back-EMF sensed by the same number of volts? You might then run into problems with the feedback control overpowering the motor trying to get the EMF it expects. Link to post Share on other sites More sharing options...
CourthsVeil Posted September 21, 2016 Share Posted September 21, 2016 The diodes would suppress the back-EMF - rendering it useless! Armin Link to post Share on other sites More sharing options...
paul 27 Posted October 17, 2016 Author Share Posted October 17, 2016 Is the Hornby HM2000 as good as the Gaugemaster for slow running. Link to post Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.