h-bridge problem

[mister_e]

Sorry Vision for my stupid attitude...

The major problem is the reverse biased diodes for your PNP transistors. AND if you're going to drive inductive load, you'll have to add 4 diodes to avoid back emf.

something like the following is recommended
http://www.mcmanis.com/chuck/Robotic...t-circuit.html
OR
http://www.bobblick.com/techref/proj...e/hbridge.html

There's also dedicated ICs for that. L293D is popular.. and there's more and more like that.

HTH

welcome to the forum... even if you're using PDS Proton

[vision]

skimask :Thank you for your hint about the google IMAGE search,I didn't even think about it

mister_e :Thank you man

I'll inform you about the results

[skimask]

skimask :Thank you for your hint about the google IMAGE search,I didn't even think about it

mister_e :Thank you man

I'll inform you about the results

skimask :Thank you for your hint about the google IMAGE search,I didn't even think about it

Well, that backfired on me...and I thought I was being a smart ass! Glad you got some use out of it...
JDG

[Ron Marcus]

I use the L293DD for both stepper and DC gear head motors. It is a great work horse, but is there something smaller and or lower power for driving motors up to 100 mA? The Microchip 4424 looks good, but you would need two for the steppers. Any ideas?

Thanks,
Ron

[vision]

I tried out this circuit and worked fine....

thank you people