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A new idea for Radio Control from Australia - Maybe
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 Posted: Mon Mar 8th, 2010 05:12 pm
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W C Greene
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OK, maybe the run time is pretty short. How big (physical size) is this converter?  The technical link had no dimensions on these converters. Sound operation is the biggest source of battery drain. A loco that has no sound may be able to run for several hours with a 7.4 volt li-poly before recharge. The same loco with sound is doing good to get a little over an hour run time. Besides that, most sound decoders don't come on until they receive 7 volts-Tsunami is that way. Since I don't mess with sound effects, it is all lost on me anyway.

         Woodie



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 Posted: Mon Mar 8th, 2010 08:20 pm
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Herb Kephart
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Neil- you wrote----"Herb, can you give a little advice how best to respond to your request."

How about a schematic? Also, like Woodie, I would like some idea of size. Vi-Vo and max Ma would be helpful also.

Herb :old dude:



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 Posted: Mon Mar 8th, 2010 10:28 pm
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W C Greene
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Neil-thanks for all this information, I am glad that so many others are going wireless. My 1:35n2 locomotives run with 2 cell, 7.4 volt Li-Poly batteries, one Shay loco uses an 11.1 3 cell job since it runs way too slow on just 7 volts. Long ago, I decided that I never ran my locos on more than 6 volts when they were dc, so the 2 cell batteries work great. I have a Model T railcar that uses a small 7.4 volt battery due to the Falhauber gearhead motor and 2:1 crossbox which I would love to install a 1 cell with a converter due to space considerations. That's why I was interested in the size of the converters. Keep up the good fight.     Woodie



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 Posted: Tue Mar 9th, 2010 05:54 am
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Stanton
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This is the converter I build myself, which is more or less a reference design from the IC manufacturer's web site. It converts an input between 2.5 and 5 volts to a regulated 12 V output. It can provide 400 mA output current, maybe more; I haven't required this kind of current so I did not test for max capability. I designed the circuit board for minimum space. It measures 1 inch by 1 inch using a 2-sided PCB, which is 3/8ths of an inch thick when components are mounted both sides.
 



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 Posted: Tue Mar 9th, 2010 03:09 pm
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Herb Kephart
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Neil

Thank you! One  question--you show R1 as .03  ???  Sounds like a near-perfect short--

Herb :old dude:



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 Posted: Tue Mar 9th, 2010 11:59 pm
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Stanton
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Hi Herb,

You're looking at a current sensing resistor that provides feedback to limit maximum output current. 0.03 ohms limits output to roughly 500 mA at 12 volts when the voltage input is 4 volts. The following manufacturer's circuit (courtesy of Maxim) may help explain what's going on.




 



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 Posted: Wed Mar 10th, 2010 03:57 am
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Stanton
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Hi All,

Thanks for your interest in the step-up converter. Pictures are more interesting than circuit diagrams, so here it is:




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 Posted: Thu Mar 11th, 2010 10:16 pm
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Herb Kephart
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Neil-

You told me that this is only the voltage step up board, and that you have now incorporated it into the receiver.

How about some details on the system- frequency, comparability with other systems, etc.

How many operators can use the system at one time?

Do you make the transmitter as well as the receiver? I know that you have been working on this for several years, and use it on your own HO layout. Has it been tried by others? Do you have more refining to do?

Are the RX and ESC incorporated into the same board?

Neglecting the battery, what is the size of the components that go into the loco? If you are using it in HO equipment, it must be fairly small.

How does DCC fit into this whole picture?

As Woodrow is fond of saying "Expiring minds want to know"


Herb  :old dude:--- who not too long ago thought that a crystal set was high tech---



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 Posted: Thu Mar 11th, 2010 11:04 pm
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Bill Fornshell
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Hi Herb,

I had all the same questions so I subscribed to the magazine so I could follow along.

I think most of your questions will be answered in the next two parts of Neil's magazine article.

You may be putting him on the spot asking him to talk about the contents of the article in a public forum before it has been published.

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 Posted: Thu Mar 11th, 2010 11:18 pm
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Herb Kephart
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Bill-

I certainly do not want to put anyone on "the spot" or force Neil to divulge something that he would rather not.


Neil-

Answer as many or as few questions as you see fit. I suppose that I should subscribe to the magazine, but I have missed half the articles already. I will see if I can get back issues.


Both- Just sent in a subscription and an order for all 2009 back issues


Herb  :old dude:

Last edited on Thu Mar 11th, 2010 11:32 pm by Herb Kephart



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