Hi,
Disconnect one battery and run the motor from 2 batteries in series.
Other solutions:
* gearbox
* duty cycle controlled halfbridge (it gives better speed control than simple one-Mosfet solution)
I assume there are suitable circuits on ebay.
Thanks but you will have to treat me like an electrical idiot ! i can obviously work out how to disconnect one battery but as for a duty controlled halfbridge i am lost! can you point me towards what i need and where i wire it in - presumably just after the batteries
Hi,
Does this have an accelerator pedal? We could skip the electronics tampering and affix a rubber stop under the accelerator pedal in an appropriate place so as to limit the maximum pressure your son can apply. Even one of those ~3cm high rubber cylinders with a screw used as door stops might suffice.
hi i am trying to post some pics but this site just refers me to something called igmur! thats exactly the sort of thing i am looking for - something like a second speed control- it looks like its kind of a bespoke unit that slides in and out on the end of the accelerator pedal- i will go see if it has any specifications on itAn alternative that doesn't need too much technical knowledge is to electrically (as opposed to the door stop being mechanical) limit the accelerator. I would assume it is a variable resistor (works a bit like a rotary volume control) with a return spring. If you can find out the value of the control you can add a second one to limit it's range of adjustment. A second control could be adjustable from 'no effect' to 'crawl along' so you can pre-set the top speed by just turning it (but don't tell your son that!). A pre-set control will cost very little (about 1 pound UK).
See if you can find out what is actually operated when the pedal is pressed. You will probably find a small rotary control with some numbers on it. Let us know how many wires are attached to it and what those numbers are. A photo would be useful.
Brian. ( who's car doesn't go much faster than your son's)
Try this - I'm an administrator on here so my screen may be a little different to yours so forgive me if I'm writing about things you can't see.
Above the message window see if there is an icon that looks like a square with a dot in each corner, the mouse-over text would be "Insert Image".
Click "From Computer" then "Basic Uploader" (bottom right of the pop-up window)
Click 'Browse' and select the file from your computer.
Click "Upload files".
Give it a moment to finish the upload then it should close the window and add some 'attach' number to the message.
You probably wont see the image in the text until it is actually posted, the forum insert the image into the message as it prepares it for viewing.
Most variable resistor have the value marked on them. It will probably have something like 10KA and a manufacturing date code. From the numbers we can probably decode the value and from the number of wires connected to it was can tell how it is connected into the circuit.
Test image is me trying the method out. Unless you want a picture of my hand and an extrusion, ignore it!
Brian.
is there anyway i could call and speak with you directly as you seem to have the best understanding of my problem? i would be most grateful and happy to pay for anytime spent on this
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