Grandad's Junk Pile Projects #9 RC Servo cheap RC car receiver

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Added 4 years ago by tomm

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I often get asked "How do you connect a hobby grade RC servo to a cheap RC toy car receiver" and the simple answer is "You don't". A hobby grade RC servo uses 3 wires Positive Negative and Signal. A typical cheap RC toy car uses 2 wires Positive and Negative. The cheap receiver steers the car by sending current one way to turn left and reversing the current to turn right. The hobby grade receiver sends the servo a steady current to power a small circuit board inside the hobby grade servo and it sends a signal on the signal wire to tell the circuit board what to do. The circuit board then sends current to the servo motor to turn it in the required direction for the required amount. You can remove that circuit board and drive the servo direct from the cheap receiver but you will not have the fine control you would with a hobby grade receiver and you will probably damage the gears as you will have no electronic feedback to stop it at the end of it's travel in either direction.

If you have a question it is probably worth reading this video description first because the answer may already be here. To help you find my videos I made two search guides https://youtu.be/ceBSOoOHcgw or https://youtu.be/Zj4UgwkwYRk or checkout my playlists page https://www.youtube.com/user/GrandadIsAnOldMan/playlists?flow=grid&view=1

Here are the eBay listings I have used, they are probably well out of date. I am not endorsing these products I am just answering the questions people have asked. I recommend you do your own search as prices and specifications will vary.
The radio control transmitter and receiver listing http://www.ebay.co.uk/itm/190888163364
Last time I bought servos I got 10 on this listing 10pcs SG90 9g micro small servo motor Robot Helicopter Airplane controls http://www.ebay.co.uk/itm/291596081877

Help File - Modify RC Servo for DC working and continuous rotation https://youtu.be/lHIVY5-xWq4

Filmed using FujiFilm FinePix S4800
Edited using Serif MoviePlus Starter Edition
Low Pass Filter 6500 hz

Here is a selection of related playlists
Working with RC servos https://www.youtube.com/playlist?list=PLA5a2xPRSrB1nJ5I3Uzrjf41VCJzrab4p
Radio Control Remote Control playlist https://www.youtube.com/playlist?list=PLA5a2xPRSrB13Xcquw4Ff09MQzTPjeVkI
Grandad's Junk Pile Projects playlist https://www.youtube.com/playlist?list=PLA5a2xPRSrB3nEGP2gKbHDmCA-84uZ6b5
Help Files playlist https://www.youtube.com/playlist?list=PLA5a2xPRSrB2v0vxMJyZ9cPweAGx1FK6e

I have thousands of videos on YouTube covering a wide range of subjects. To find them follow my search guides https://youtu.be/ceBSOoOHcgw or https://youtu.be/Zj4UgwkwYRk or see my playlists page https://www.youtube.com/user/GrandadIsAnOldMan/playlists?flow=grid&view=1
Generally my projects are for my grandchildren to enjoy. OK, I enjoy them too. If anybody else likes them, that is a bonus. I like to keep my work as simple and basic as possible so that it can be copied easily and improved by anybody who wants to try themselves. I recycle or repurpose items rather than buy new and when I do buy I like to keep it cheap.
https://www.youtube.com/user/GrandadIsAnOldMan