tankist
Active Member
i built transistor operated one based on this (scroll down a bit):
http://home.cogeco.ca/~rpaisley4/CDPSU.html
and the most awesome part - surprisingly it even works!
powered by separate 18V suply for HP printer
here is the voltage comparator based current blocking charge unit with 2 discharge transistors. basically ready to operate 1 turnout as is. LED indicates "charged". while i'm not going to see it normally i chose to keep it for troubleshooting purposes (and since i really like LEDs ). activation of coils is by shorting the appropriate double pin headers. the 2 wire terminals on the left connect to additional discharge boards (6 channels - 3 turnouts each). the lone pin header carries the comparator input to the next boards.
no sticky welded buttons and burned out coils for me
it does look quite ugly but it will be hidden from view anyways. i still need to see if the 25V 2200mF capacitor will throw more then one turnout at once.
http://home.cogeco.ca/~rpaisley4/CDPSU.html
and the most awesome part - surprisingly it even works!
powered by separate 18V suply for HP printer
here is the voltage comparator based current blocking charge unit with 2 discharge transistors. basically ready to operate 1 turnout as is. LED indicates "charged". while i'm not going to see it normally i chose to keep it for troubleshooting purposes (and since i really like LEDs
). activation of coils is by shorting the appropriate double pin headers. the 2 wire terminals on the left connect to additional discharge boards (6 channels - 3 turnouts each). the lone pin header carries the comparator input to the next boards.no sticky welded buttons and burned out coils for me
it does look quite ugly but it will be hidden from view anyways. i still need to see if the 25V 2200mF capacitor will throw more then one turnout at once.
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