10 replies to this topic

[Carter]

What info can you help with and what is the box and what does it do? Thanks for any help.



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[zipper]

No idea of the brand - very old electronic controller and the box has among other things a power transistor which is visible. It delivers the power to the car and can run pretty hot.

[SerfProd]

Guess is from the way it is constructed very early Rudock

If so the box is potted with epoxy to hide his circuitry

[mreibman]

Bet it's a Ruddock dr40....

[drrufo]

It is an old Ruddock with two transistors. If the main transistors are bad they cannot be fixed because of the potting compound. They are the same as a DR-40. It has an old nine band circuit board. Just clean it up and  make sure the transistors on the board are good.

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[John Luongo]

the transistors remind me of a Motorola type. very nice controller

[Bill from NH]

The switch is probably for both positive & negative gating. 

[Dominator]

When the DR-40 first came out I believe the polarity switch was only ever mounted to the box. Maybe someone replaced the rheostat with a toggle switch?

[Bill Seitz]

The transistor is in an industry standard TO-3 package and isn't unique to a particular brand or power transistor part number. Power transistors in this package are still available, although they're going up in price rapidly. Motorola spun off the transistor business to ON Semiconductor who was still manufacturing some of the Motorola-unique high power part numbers until recently. I use them in the controllers I've built for myself.

[Carter]

Thanks for the help if anybody is interested in buying let me know before it goes on eBay. Located in Azusa California Thanks Carter


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[Jim Difalco]

It is probably a brake on/off switch, it is not a polarity switch which was in the potting compound. The TO-3 transistor package is available but transistors have very different wattage and amperage characteristics.

 

Way back when Ruddock started I bought one of the potted controllers and removed the potting material just to see what he was doing. I think I applied paint stripper and when it softened I could scrape off the soft compound. After many applications I got to the wiring and relay. When I started producing controllers I thought it was fruitless to hide my design, I would just have to build it better than everyone else. Dan followed my lead and started building his controllers with an open design.

 

I think I still have the de-potted controller in my collection.