ORIGINAL: da mad maori
ive been tring to come up with an easy cheap circuit for a while now.. (off and on)
since my first attemp.....
this circuit worked wonderfully BUT i fried the boards though my own stupidity, i went to order more boards but the manufacture went outta business!!!! DAM
so it was back to the drawing board... i enlisted the help of a elec-tech head buddy to help me.......
we do have a working circuit which is in testing now.... ill let ya know the circuit when its tested and done
the idea of building a huge strong servo (wiper motor servo) for a homemade large rc is not really that hard... you dont need to know alot about electronics........
all ya doing is intersecting a standard servo before it goes to the servo motor,and routing it to bigger power switches (mosfets) and motor (wiper motor)
its almost that easy
and depending on what circuit you use, it could cost you as less as $70 to build a servo that can easily take a finger off without even struggling... (lets hope that doesnt happen)
anywho some findings that we've come across are... (for mosfet based circuits)
the donor servo should be a mosfet based servo... the easiest way to tell is remove the back panel, plug it in and let it center...put a multimeter on one of the motor connectors and on ground connection... if it reads voltage (say around 2 volts) then its NOT mosfet based.... if it shows no voltage, then its mosfet ....
also almost all digital servos are mosfets........(digital = expensive)
most cheap chinese copy 1/5scale cars also use mosfet servos (GWS)
while my buddies finishing our circuit, i did find a some other circuits that work
here is an Hbride using power transistors instead of mosfets
you can use any standard servo for this circuit
this is the car its on i found on youtube
here is an hbridge cicuit using realys... i wouldnt recomened it it with abit of messing around it could work
can anyone add experience to all this there are ALOT of people that want to build these things
When all else fails you will realize you should have just bought a tone servo.
Problem solved. Great servo.