ELECTRONTIME Posted May 19, 2021 Share Posted May 19, 2021 I have been given the above controller for my boy's to use on their train layout. There is no model number on the case so I can only tell you the functions it has in the hope someone recognizes it's identity. The functions are Main Power and Direct Power ( both variable ) Three switched positions for Braking , one for Coast And a Forward - Reverse switch. The variable output voltage remains at 12v and is un-controllable. Does anyone have a schematic for this, or any other Codar Controller that I can use to repair this unit. Many Thanks Mike Link to post Share on other sites More sharing options...
RAF96 Posted May 19, 2021 Share Posted May 19, 2021 Please see here for previous discussion... Link to post Share on other sites More sharing options...
ELECTRONTIME Posted May 22, 2021 Author Share Posted May 22, 2021 Having inspected the circuit it must be in the region of at least 50 years old as the transistors are of the OC range. The power transistor is a OC25, the others are partially visible and thought to be OC71. Link to post Share on other sites More sharing options...
RMweb Premium BR60103 Posted May 23, 2021 RMweb Premium Share Posted May 23, 2021 I have instructions for the CM1 and SM1 units but no circuit diagrams. I think I bought the first one nearly 50 years ago. I had a problem with it when the rotary function selector switch fell apart internally. I never had the full skill/couage to take it out and replace it, but I have two replacement units which still work. Link to post Share on other sites More sharing options...
ELECTRONTIME Posted May 25, 2021 Author Share Posted May 25, 2021 Thanks to those who replied to my original request. I have drawn out the circuit and have since used more available components to rebuild the unit. A few of the resistors needed changing to match the new transistor characteristics but all is now functioning. 3 1 Link to post Share on other sites More sharing options...
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