 | Voltage buffer for small locos |  |
 Posted: 02.09.2009, 21:42 |
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| sysoptiger |
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| Joined: 20 Apr 2007 |
| Posts: 165 |
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Again and again the question came up, how to put the Massoth voltage buffer or the Goldcap module in a small loco e.g. Light railway or Stainz. Just on such small locos a buffer is suggestive. Sadly physics set here boundaries. A buffer, who has enough energy, has a appropriate size.
But locos who have neither a vaporizer nor an illumination, and they won't drive anytime in switching speed over routes, a very small buffer can have the same effect. 1000µF would be enough for such an application. You can get such capacitor in sizes of 10x25mm, which you can place in a “LGBchen”.
The picture shows you the circuit and a sample for realization.
On bigger locos with enough place inside you should absolutely use a ready to go circuit with a proper decoder.
With an additional 3. control line you can control the eMotion-XLS decoder in a optimal way. It reduces the starting current with delayed slow turn and on programming the buffer will be turned off completely.
Now some comments for the parts.
Elektrolyt condenser:
- The capacity should not be higher than 2200µF, while charging takes too long.
- In place of 1 big Elko you can also use more smaller Elkos parallel.
- The Elko has a fixed polarity! Don't swap + and -! Danger of explosion!
- On normal garden railway using (20..24V) the electric strength should be 35V.
- Under 20V track voltage you only need 25V, while possible voltage peaks won't get so high.
Charging resistor:
- It should be min. 150 Ohm, to limit the charging current.
- Most central stations have problems with programming when current is to high.
- If you install more of these buffers some central stations will not start cause of the starting current.
- On pure using of the buffer on DiMAX-central stations you can decrease the value to 47 Ohm.
- DiMAX-central stations tolerate definitely higher starting- and programming current.
Discharging diode 1N4007:
- It ensures for a fast and good current supply of the decoder, when the track input is interrupted.
- On small locos you only need an amperage of 1Amps.
- On bigger locos you should select a 3Amps type (e.g. 5407).
Important:
The buffer should be connected on the decoder only on internal decoder voltage behind the commutator.
If you connect them directly on track, he can on extreme case explode and also it would make track signal unreadable.
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_________________
Peter Ting (EDV, CAD, DIMAX-Service)
Massoth Elektronik GmbH
Frankensteiner Str. 28
64342 Seeheim-Malchen
E-Mail: forum@massoth.com
WEB: www.massoth.de
Sitz der Gesellschaft: Darmstadt
Amtsgericht Darmstadt HRB 4791
Geschäftsführer: Christoph Massoth
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Massoth Forum Index » Special connection diagrams + Addon ciruits
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