what dc motor driver? l293 and a l298

[Vandal S]

dc motor driver

i need to control 2 dc motors, 6V or so (rc car motors, but one of them needs 3.5Amps if i measured corectly), no pwm, speed control or something like that, just on and off and reverse. i have a l293 and a l298. a have simulated in proteus, i put a uC, l293 and 2 motors; it gives at the output too small voltage. the l298 doesn't seem to work; i bought it for the 3A performace but it seems to be just for other tips of motors with pwm and that stuff.
so, what should i do? buy another drivers or i haven't done something good in proteus and they work just fine?

 

[garg29]

car dc motor controller

Can't say exactly what you are doing. You can try L6203

 

[Vandal S]

1n5822 l298

thanks for the replay
i'm trying to control a car with my h bridge, and not use the circuit on the cheap rc car.
so the h-bridge ic is for 5-6V, and can accept 3Amps (if i measured corectly) and for 2 motors in any direction

LATER EDIT: it seems i have forgotten about connectiong sens pin at the ground for the l298 and now it works; so the question is: does it work in real life only with dc signal? or it definitly has to be pwm or something?

 

[KamalS]

what dc motor driver?

Hey .. just build the McManis bridge - that way you can use higher amp transisitors!

The 298 can burn out for your motors @3AMPs!

 

[Vandal S]

Re: what dc motor driver?

making an h bridge is not an option, for me, at least. i would like to buy in IC, easy, quick and efficient
if i use some diodes, will them protect the l298?

 

[sau_sol]

Re: what dc motor driver?

for driving a DC motor in bi-directional mode I used 2 Relays
they are the most reliable and easy to use then all other available options
and also cheaper

 

[Vandal S]

Re: what dc motor driver?

probably true, but i have already spent some money on the l293 and maybe i can make it work.
so i have 2 motors (on the car initialy, one was alimentated at 5.5, had a resistence of 2.2Ohm and the other one is smaller, no problem at that one)
i will put the l293 at 7.5V. if it will give 7V (the h bridge ic) => above 3Amps. which is a problem, in dc continuous current it says in the datasheet that maximum is 2Amps
i have 8 1n5822 diodes. will they protect the circuit?
i also can put a 4Ohms resistor on the sens pin; i think it will make I<2Amps. would i still have to put diodes?
and also for testing i could put a single motor in paralel function (in the datasheet it says unit 1-4 and 2-3. i didn't undestand, maybe because it 4a.m., but in my case it think it will work with 1-3 2-4, but that just depends on the input pin.
so...
1. always diodes?
2. 3-4ohms will do the trick without any other complications?
3. anybody has a schematic for a pic 16f8x and a h bridge?