Subject:
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Re: Transformer Power
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 5 Jan 2005 20:04:06 GMT
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Viewed:
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1992 times
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> - Heavier version of the LM317 regulator IC in TO-3 housing (should do at
> least 1.5, peak up to 3 amps, IIRC LM317K is the TO-3 version)
Check the Linear Tech LT1083/4/5 series. They are pin compatible with the part
that is already in the controller.
LUCNY uses some of my modified controllers. You need to change;
The bridge rectifer diodes to handle the chosen maximum current
The smoothing capacitor as the ripple voltage will be higher at higher current
and "dip" into your output voltage.
The heatsinking. (I fabricated a multi-fin heatsink with a tiny 1" fan to keep
it cool.
We've used these controllers for three years without serious reliability
problems.
One let go at Brickfest two years ago and surprisingly it was one of the 5A
bridge diodes that popped.
JB
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Message has 2 Replies:
 | | Re: Transformer Power
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| (...) I'll have to look into that. I'm really not running the motors anywhere near their limit. The biggest single load is this train: (URL) at 1/2 speed, when the car is full of soccer balls. And, that's running off an RCX. Thanks for the info (...) (20 years ago, 6-Jan-05, to lugnet.trains)
| | | Modified Transformers Question (Re was: Transformer Power)
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| (...) John, We had the luxury of using your controllers at the NMRA show (Thanks a ton!), and I am interested in modifiying my own. I think I've got enough information to swap the internal components, but negelected to look at the wallwart (power (...) (19 years ago, 18-Jul-05, to lugnet.trains, FTX)
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Message is in Reply To:
| | Re: Transformer Power
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| (...) "BAD" things won't happen, the circuit is kiddy-proof :) (the regulator IC will shut down when getting too warm) If you're a good D-I-Y person with electronics/soldering experience my mod might be for you. Requirements - Screwdriver to open up (...) (20 years ago, 5-Jan-05, to lugnet.trains)
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