24v dc motor with plunger pot

[Adam Thomas]

Hi,

New on here. I will be undertaking a Toylander project which is a mini Landrover with electric motors for the kid. I haven't done elctronics since the mid 90's at GCSE so not too familiar with things. But anyway, I wanted to (as cheaply as possible) wire two 24v motors (180w) with a plunger pot as a throttle peddle speed control. I will have 2 12v car batteries wired in serial. The only plunger pots I can find are 5k. Will this be man enough for the job. I can't remember zip about resistance so apologies for that.

Or has anyone got a solution that would work (as cheaply as possible) that a complete novice could do?

Thanks in advance

 

[dr pepper]

I've used this circuit or lightly modified it to do similar things, 5k would probably be fine in place of the 1k.

https://www.eleccircuit.com/wp-content/uploads/2007/07/ee2382390-1.gif

 

[Adam Thomas]

Thanks for this. I haven't done anything like this since school so should be fun! Would you wire both motors in the place where you have shown the one or separate circuits for both.
Many thanks

 

[dr pepper]

The circuit shown drives a 150w motor, so maybe 2 of the circuits are right for your needs, if you connect pin 3 of each '494 together, and of course the grounds you'll be able to control both motors from the one pot.
Loading the 5k pot with 2 inputs which are not particularly high impedance on the '494 might make things non linear, but I think for a kids truck it'd still work fine.

 

[Adam Thomas]

Thats great, i'll give it a go. It'll be a few weeks before i get things up and running but i'll let you know how i get on. Thanks