H-bridge

[debe]

Heres a few more, I find them easy to use & free. (First one in group is not suposed to be there)

 

[AtomSoft]

Thanks heh

Here is my current schematic... how does it look now ?

 

[cr0sh]

Thanks heh

Here is my current schematic... how does it look now ?

Much better - just make sure A & B aren't high at the same time, and it should work fine...

 

[AtomSoft]

HMM... Can i simply use a inverter to connect A and B and use another transistor to enable and disable the inverter hence making this 2 wires only with no possible chance of putting both HIGH ?

 

[AtomSoft]

Like this:

 

[Joe G]

you know, i never gave that a thought,.,,. but you will loose brake and free wheel capability. it fwd or rev.

 

[cr0sh]

HMM... Can i simply use a inverter to connect A and B and use another transistor to enable and disable the inverter hence making this 2 wires only with no possible chance of putting both HIGH ?

Rather than enable/disable the inverter, leave it connected, and use the transistor (between ground and your h-bridge) to switch power to the entire h-bridge; you won't gain back EM braking (it will still be "freewheel"), but maybe with some extra logic (perhaps instead of the transistor switching power, or maybe in addition). Ultimately that will depend on whether braking is important to you.

 

[AtomSoft]

ah ok cool. I just need something to move back and forth heh fast stopping isnt needed.

 

[AtomSoft]

Ok im about to make a PCB without the INVERTER ... i dont have heatsinks but i do have a nice small fan from a old laptop cpu. You think that would be good enough ?

 

[AtomSoft]

wow doesnt work. Did you people notice it was a PNP and NPN so if i supply power only one will work. So my original schematic would have worked. Probably only needed resistors

 

[AtomSoft]

Wouldnt this work then:

 

[Joe G]

if A is + and B is neg,(and vise/versa) i don't see why not, i'd give it a go...

 

[AtomSoft]

yeah... heh ill give it a try

 

[Reloadron]

Hey Jason, this is a link to pretty much what you want, it actually uses the mentioned transistors (2N2907 and 2N2222 versions). Either Q1 and Q4 are on, Q2 and Q3 are on or both are off. At no time can all be on which as covered results in a dead short and things get ugly. Give the link a read and look it over, it should be pretty much what you have.

Ron

 

[AtomSoft]

thanks... im making a new board now heh

 

[AtomSoft]

ok my version works well!! yay its alive!!!. Basically i saw a video on using a old cdrom as a base for making a agitator for etching pcbs so it opens and closes automatically. I finally written entire code and test and works like a charm!!!

 

[Reloadron]

Glad it worked out for ya Jason.

Ron

 

[AtomSoft]

Thanks i added images to previous post.

3. Full System
2. MCU
1. H-Bridge

I used 1 button and 1 slider type button both can be from original CD-ROM..

 

[TechnoGilles]

Cool !! I like that project !!

Still think it would have been easier with the L293D though ...

But hey, why buy the bridge when one can make the bridge himself !!

I really like that forum ! Learned a lot since I found it !!

 

[AtomSoft]

Check it out :