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George W
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Hi Gang,

I have a cheap HO Power Model engine and the head light is only as bright as the speed of the engine. Slow speed equals dull light, very high speed equals bright light.

Is there a way to have the light bright all the time?

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Helmut
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Well, not all times, but when the engine is moving - as done in MR 1956:

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Herb Kephart
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Helmut,

George (and others) may not understand the diode symbols,
or how the drop across them influences the lamp.

Herb

George W
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Herb Kephart wrote:
Helmut,

George (and others) may not understand the diode symbols,
or how the drop across them influences the lamp.

Herb


Yup, I'm clueless. I don't understand it at all.

W C Greene
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Radio Shack (and others) have miniature DIODE BRIDGE RECTIFIERS which fit into most everything. You DO need to replace the 12 volt bulb with a 1.5 volt bulb. I still use these "constant light" diodes in my r/c locos, I have used them in DC locos for maybe 40 or so years. If I can do this (I am a lektric doofus) then anybody can.

Woodie

### Well, you can wire for DCC and then the light will be on when the loco is standing still. ###

Helmut
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@GeorgeW
Maybe this makes it clearer.

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Last edited on Fri Mar 13th, 2015 08:47 pm by Helmut

pipopak
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... Radio Shack is no more (at least here). Jose.

Kent K
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With the justified demise of Radio Shack, there are other places to order electronics parts. Some of them include:

Newark Electronics
Allied Electronics
Digi-key
MCM Electronics
Jameco

Check their websites for particulars or do a search for electronics mail order suppliers. I have ordered everything from resistors and small parts to complete computer systems on line and had relatively little trouble. Often items from walmart and Kmart can be re-purposed for hobby use. I am thinking specifically of items like the LED strings of several individual lights. It does help to be somewhat familiar with the electronics components themselves, but I have found that usually there is someone in the community who will lend a hand. Sometimes a student can be enticed to help out with proper incentives.

Kent K

George W
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W C Greene wrote:
Radio Shack (and others) have miniature DIODE BRIDGE RECTIFIERS which fit into most everything. You DO need to replace the 12 volt bulb with a 1.5 volt bulb. I still use these "constant light" diodes in my r/c locos, I have used them in DC locos for maybe 40 or so years. If I can do this (I am a lektric doofus) then anybody can.

Woodie

### Well, you can wire for DCC and then the light will be on when the loco is standing still. ###


Thanks for the info, Woodie :)

George W
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Helmut wrote:
@GeorgeW
Maybe this makes it clearer.



Yes, that's helpful, I can follow that. thanks Helmut

George W
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Thanks for the leads, Kent :2t:

Herb Kephart
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One thing that I never liked about the ''constant'' light with diodes is that with trolleys or interurbans the light gets preceptively brighter when the car starts off (due to the model motor drawing a little more current) rather than the protypical dimming under the same conditions (due to voltage drop in the overhead because the motors are drawing more current)

Never figured a quick and dirty fix for this--would undoubtedly require transistors, chips*, or other such that I don't understand--so don't use lights--but it all ways annoyed me.

*Well, I do understand potato chips, but don't think that helps----

Herb

George W
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The only reason I'd like a bright light at slow speed is my train runs through a short tunnel and I think it would give it some added life in general. Not shooting for realisim , just effect

Helmut
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So the only way not to annoy Herb seems to be: Avoid starting your loco in a tunnel.

Herb Kephart
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Well trust me Helmut, there other ways-
Like the fact that I never learned German--

Herb


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