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Railpro for 7 1/2 gauge

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Cbrocco:
So I'm thinking out the box on this one. I use Railpro for G scale now and have been adventuring into 7 1/2 gauge making a custom engine. I would like to use the LM-3s-g unit to be the brains of the train because all the sounds and controls would be the same but obviously the amps would be way too high for the unit in this case.

I was thinking of using some sort of Electric Speed Controller (ESC) to separate the LM-3S-G from the higher 24v 20 amp circuit just like people do for RC cars and trucks.

Problem I'm having is finding an ESC that doesn't use PWM signals meaning I can take the motor outputs from LM-3S-G and use it to control the higher voltage circuit.

Does anyone know of device that does this or have any other insist to a setup like this?

thanks,
Chris

Alan:
Use the LM-3S-G motor output to drive a heavy power transistor(s). Much like the way high wattage stereo amplifiers drive speakers. There are available many transistors capable of carrying 100 amps or more. Tim Ring could dial you in on the specifics.

Joel W:
This controller (for heavy robots, etc.) is in the range you want voltage and current wise, and allows for analogue control as well as other control methods.  It's output appears to be PWM so it may not work for you:

https://www.robotshop.com/ca/en/sabertooth-dual-2x32a-6v-24v-regenerative-motor-driver.html?gclid=CjwKCAiAr6-ABhAfEiwADO4sffRVFYHCTpkeaa4FepGFeWbzvmVUJkHAWaEEa837vxnXDZLrdW_UexoCXIoQAvD_BwE

Cbrocco:
Thanks Alan. Do you know the best way to contract Tim Ring?

I also took a try at making a 2N3055 and equivalent PNP transistor H bridge circuit like you mentioned. I attached it below. I believe this would work and provide speed control as well as motor direction too. I just don't know about grounding. Does the common of the LM-3S-G have to share the same ground as the 24v circuit?

Alan:

--- Quote from: Cbrocco on January 24, 2021, 02:19:01 PM ---Thanks Alan. Do you know the best way to contract Tim Ring?

I also took a try at making a 2N3055 and equivalent PNP transistor H bridge circuit like you mentioned. I attached it below. I believe this would work and provide speed control as well as motor direction too. I just don't know about grounding. Does the common of the LM-3S-G have to share the same ground as the 24v circuit?


--- End quote ---

Call Tim on the phone. (219) 322-0279

Yes, a common ground is required else there will be no base-emitter differential (VBE).

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