Instructables

Self-Reversing Electric Servo Motor?

Is there a circuit that can change the rotation direction of an electric motor that's cheaply and easily?

lupinesoul (author) 6 years ago
Pretty much, I want an automatic air pump for my airgun, so I need to make something strong enough to pump a bike pump. If I can pull it off, I'll be able to just hold a button while I reload and it will do the pumping for me.
just put a disk on the servo head then attach the pump the the edge of the disk
lupinesoul (author)  bad-bradley5 years ago
I know, but that would take up too much space... UNLESS! Unless I utilize that disk sticking out of the gun to run a chainsaw bayonet!
NachoMahma5 years ago
. Some motors will change direction if you swap the power leads. Others require the windings to be reconfigured. Some can't be changed. If the rotation can be reversed, a DPDT relay will usually handle the job.
lupinesoul (author)  NachoMahma5 years ago
I know, but I mean instantly, by itself. I got an answer, but thanks anyway! :D
zachninme5 years ago
This is exactly what the H-bridge is for!
You can buy the chips for about $2, or you can make them out of 4 transistors.
but be careful of inductive kickback
True. So 4 transistors and 4 diodes...