I use Pololu step up regulators. They are available in various voltage and amperage ranges. Because I am working with limited space and desire to keep cost low, I use their U3V12F9 regulator. Its input voltage is 3-10 volt and output is 9 volts. I think the amp load is 1.1 amp. If overloaded it just shuts off and restarts after load is reduced. Pulling the loads I pull that is never an issue. As you could see in the pictures it is tiny. Cost is $3.95.
Look online for Pololu Robotics and search electronics, voltage regulators, part no. U3V12F9.
Lots of other interesting stuff on their site.
Last edited on Sat Apr 15th, 2017 01:35 pm by Bob R
you need to remember that most of the small cars run on 3 volts so you might have problems with an older loco but replacing the tiny battery with even aa batteries will help I ran a ho plymouth switcher went like a rocket with 2 aas
That regulator is crazy small. Since I'm close to being dumb as dirt when it comes to electronics (I'm cell phone challenged) just how would be wired up? Since it's so small can you solder connections without creating one blob of solder? If I understand correctly you could install a 3.7 volt LiPo and the regulator would step it up to 9 volts? I do like the idea, especially since it's so tiny.
Would this work the same way? It's still on the small size, and for only a couple of bucks it would be worth playing with. Again, why not just install a small 3.7 volt LiPo and use the regulator to boost the current?
Answer to your questions......
Wiring is as shown in picture at post 1101. Very simple. The board is small but not difficult to solder wires to. The solder holes are on the edge and if you use a pencil tip iron very easy. I use a 1/4" wide flat tipped iron and never have had a problem.
The boards are available in various outputs. I use the 9 volt for most of my engines as they have 12 volt motors. 9 volts runs plenty fast. You can also get 6 volt and 12 volt.
Be aware that efficiency is lost when the voltage is stepped up. The more you step up the less the efficiency ( ie 3.7v to 9 v will not run as long on a charge as 7.4v to 9v given same capacity battery ).
The item you found on ebay is much larger. It is avilable with variable output settings. The 4 amp rating capability causes size to be bigger. The output you need and amperage draw of your engine will determine what you should use. Most HO, On30 and 1/35th like Woodies have amp draw of less than 1 amp so the small stuff works fine.
In my opinion the best setup is using a 2S 7.4v battery stepped to 9v if needed. The efficiency is very high and run times will be good.
Last edited on Sun Apr 16th, 2017 12:44 am by Bob R
Okay, went back to post 1101. Making a little more sense now. Question: Does it matter where you put the regulator? Couldn't you just as well put it after the receiver? No. If after the receiver it would essentially eliminate your throttle. You apply a little throttle and it would boost it to 9 volts.