Jim, how come these H-bridge boards were discontinued? They look like a great way to make a gearhead motor into a servo. I think I’ve seen them in a totorial how to actually.
Are they’re similar boards to this make? Will something like this be introduced later in the future?
You might want to look into the Open Servo project. Depending on what current and voltage ratings you need, Open Servos could be just what you need. A servo is basically just a motor with some electronics and a potentiometer.
8-Dale
Im aware of the open servo project however I was looking for a inexpensive and off-the-shelf approach to make a super servo with a high-geared motor (something like 60rpms).
plus its more fun when you DIY 
How are you equating buying a canned servomotor controller PCB to DIY and then suggesting OpenServo isn’t?
I don’t think you can get much more DIY then ordering OpenServo PCBs and building the boards yourself but maybe I’ve got a different idea of what DIY means then the newer generations. 
I was looking to see if I could possibly make a board entirely myself which could possibly do the same as that board. oh well…DIY means something completely different to me
From what I see the open servo project wouldn’t have anything to do with a large geared motor being converted to a large servo. From looking at parts catalogs, a 50 amp MOSFET is probaly the biggest one normally affordable. Controlling motor current of large motors is one issue. For large geared motors, PWM of the H-bridge itself is probably not needed. Sometime in the future I’m going to try to turn a cheap Harbor Freight winch into a large servo. If successful, that will probably be my 15 minutes of fame. Do a google search for H-bridge and schematic to see a number of different designs.
THANKS! 
clearly , however this isnt really possible anymore since this board was discontinud by lynxmotion a very long time ago. Unless I build my own board or have it made by batch pcb or something ( something ive never done and don’t intend to do) Im stuck @ the moment.
By the looks of it, that board came out of a Servo. You could always buy some $8.99 HS-322’s and strip the boards out of them. Add some heatsinks and try to find a way to up the amperage and voltage.
I wish there was an off the self solution for this too. I mean a 12V 5 or 10 amp servo controller board. It couldn’t possibly be that hard.
If I had enough electronics knowledge, I’d build it and sell it myself.
Can you add more Mosfets to a servo board in parallel to increase it’s power handling? I mean what really would be involved in even upping the 1 amp handling of a cheap servo board to around 3 or 4 amps? Or upping the voltage to 12V instead?
That is what I have been trying to focus on right now. Whether I can solder on some mosfets to the board. i have VERY little knwoledge of circuitry, but I want to start learning about that kind of stuff with this project. Im just looking to see if a large gearhead motor can be controlled as a servo for autonomous bots, arms ect. This would eliminate the need for a motor controller to be used with the ABB in some applications and could be a good idea for sumo bots if they are tight on space and battery voltage.
Mosfets can be paralled with a good enough driver, but BJT transistors MUST NOT be paralled. Or they burn out.
One should be able to drive a larger h-bridge from the small one in a regular servo. Perhaps a discussion should be started in the electronics section on constructing a larger h-bridge, some what like the DIY switch sticky thread.
I started that as well Well if anyone else has not started this thread, I will move this thread to the Electronics section. Hopefully a simple solution can be reached but perhaps we can also come up with multiple solutions that are little more advanced as well for larger applications as zoomkat had suggested.
