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poliss · Posted: Sat Jul 04, 2009 7:16 pm Post subject: Need Help with Tomix Point Motors

I'm thinking of getting some Tomix points as they might fit my track plan btter than the Minitrix type, but they seem to have yet another electrical system. I'd like to wire them to my Fleischmann passing contact switches.

This is what the website says. http://www.xs4all.nl/~raicho/model/control/tomixctl/turnout.htm
"1st. You need to build a special power supply. In electrotechnical terms, the power supply you need will have to give two outputs: a positive and a negative 'half-wave', which can be achieved by the use of two diodes. Use one lead of the transformer output as 'ground' and attach the two diodes to the other transformer output. Wire up the diodes in 'anti-parallel' fashion. One diode should have its marker ring at the transformer side, the other diode should be placed the other way around. The free ends of the diodes are the outputs of the power supply."

Anyone understand what 'anti-parallel' means?

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Teleman · Posted: Sat Jul 04, 2009 7:41 pm Post subject:

Nope never come across that before

If you read it without that bit it makes sence . What it means ( i think ) is you connect both diodes to the transformer on the same tag and as the doides are wired one each way there outputs will be diffrent . crap drawing emailed to you as i can't find the button to get it from Paint onto the forum

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poliss · Posted: Sat Jul 04, 2009 7:54 pm Post subject:

Thanks Pete. I understood your drawing.

An electrical thicko like me can't understand how that makes it 'half wave' or affects the electrickery in any way at all. binky

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Teleman · Posted: Sat Jul 04, 2009 8:05 pm Post subject:

Told you it was a poor picture

half wave is as it says realy , just one half of the wave

as the output from the transformer is full wave
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poliss · Posted: Sat Jul 04, 2009 8:21 pm Post subject:

Doesn't mtter if it's a scribble on the back of a fag packet to me as long as I understand it.

The top bit where the diodes are go to one terminal on the transformer, right?
I have the Maplin cat.no. of some diodes written down somewhere. (Searches through scraps of paper. Nope, that's resistors on that bit, what are these phone numbers for??? More resistors on this bit, who's neil hamilton?
AH-HA, found it!! Are IN 4001G diodes ok to use?
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Teleman · Posted: Sat Jul 04, 2009 8:58 pm Post subject:

poliss · Posted: Tue Jul 07, 2009 5:17 pm Post subject:

Went to Maplins, the diodes I wanted weren't in stock. Said to sales assistant the exact model wasn't essential, what others near the spec did he have. None until you get up to 1000v capacity. Had to leave an order in till they come from the warehouse.

I wish there were other high street retailers you could get electronic parts from. I don't really like buying from Maplins after their battery scam.
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poliss · Posted: Sun Jul 12, 2009 5:36 pm Post subject:

I have the points, but the track that fits to it needs a bit of sawing to get everything to fit.
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poliss · Posted: Mon Jul 13, 2009 6:09 pm Post subject:

Modified this diagram from a Kato version. Instead of the momentary switch I would swap for the passing contact variety. I think this is what the instructions meant.

1st. You need to build a special power supply. In electrotechnical terms, the power supply you need will have to give two outputs: a positive and a negative 'half-wave', which can be achieved by the use of two diodes. Use one lead of the transformer output as 'ground' and attach the two diodes to the other transformer output. Wire up the diodes in 'anti-parallel' fashion. One diode should have its marker ring at the transformer side, the other diode should be placed the other way around. The free ends of the diodes are the outputs of the power supply. You wire a 1 Amp fuse in series with the transformer, but it's not really needed when you use a transforner with a built-in overload protection circuit.. Use diodes that can handle at least 1.5 Amps. Another option is the use of an old PC (AT version!) power supply or an old power supply of an HiFi amplifier.

2nd. Wire up your point control circuit. Cut-off the plug from the Tomix point motor, then connect one lead to the ground terminal of the power supply. Connect the other lead to the 'wiper' side of the Peco switch (centre terminal), then connect the two other termals of the switch to the output terminals of the power supply. Then test function of the circuit. If the action of the lever is the opposite of what you want you can either change the power supply outputs or simply turn around the switch. Peco switches can be build into control panels with a panel mountin plate (PL-2

or build into a console (PL-27) which accepts 6 switches. Other switches in the Peco range are a single-pole on/off switch and a single-pole changeover switch. Some accessories complete the range, like mounting plates, a console in which you can mount switches, a joining bar and crimp terminals which save you soldering wires.

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Teleman · Posted: Mon Jul 13, 2009 8:52 pm Post subject:

That looks okay
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poliss · Posted: Mon Jul 13, 2009 9:31 pm Post subject:

I may be barking up the wrong rain forrest, but does that make it some kind of DC circuit??
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Teleman · Posted: Mon Jul 13, 2009 9:44 pm Post subject:

Err sort of , Point motors don't care if they are AC or DC powered
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poliss · Posted: Tue Jul 14, 2009 12:12 am Post subject:

These are strange Japanese point motors though. Not that it's easy to find out anything about them.

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