L293D H-Bridge: Is it effective to run a small DC motor in a model

R

rancid rock

New Member

• Jun 29, 2006

• #1

hey,

I was wondering if the L293D H-Bridge is effective in running a small DC motor for a model representation of a door.

If not, have you found a another H-Bridge that could do this job effectively and simply.

because apparently the L293D is capable of running a stepper motor !

thanks,

 

R

rancid rock

New Member

• Jun 29, 2006

• #2

no one knows about H-Bridges?........

 

Z

ZIGGY_DAN

New Member

• Jun 29, 2006

• #3

I don't know much about h-bridges but there are many posts on this forum about h-bridges and from what i can gather the h-bridge can run a dc motor forwards and backwards and i can see no reason why it should not work for your task. The L293D is very commonly used for driving stepper motors and dc motors.

i suppose it depends upon the specifications of your motor,

DC operating voltage?
current draw?

i'm no expert on h-bridges.

hope this helps

don't forget a reverse biased diode across the windings to prevent counter electro motive force.

 

J

JRoque

New Member

• Jun 29, 2006

• #4

Hello, I've used the **broken link removed** with good success.

JR

 

R

rancid rock

New Member

• Jun 30, 2006

• #5

ok thanks JR i'll chek that out

 

N

nsafadi

New Member

• Jul 3, 2006

• #6

try L298 .. it's out 4A and can frive 2 dc motors ..

bye

 

philba

New Member

• Jul 3, 2006

• #7

rancid, you need to tell us what current your motor will pull. if it's a small motor, I'd bet the current level will be fairly small and thus the L293D will work just fine. You will only need 1/2 of it, by the way.

 

R

Russlk

New Member

• Jul 3, 2006

• #8

I built a servo to drive a small antenna using LM324 op amp, so power is not necessarily needed.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Jul 3, 2006

• #9

Russlk said:

I built a servo to drive a small antenna using LM324 op amp, so power is not necessarily needed.

Click to expand...

It's got to have been an absolutely tiny motor?, an LM324 can provide hardly any current at all? - I'm doubtful there's a motor that low power? (that could move anything worthwhile).

 

R

Russlk

New Member

• Jul 3, 2006

• #10

Nigel Goodwin said:

It's got to have been an absolutely tiny motor?, an LM324 can provide hardly any current at all? - I'm doubtful there's a motor that low power? (that could move anything worthwhile).

Click to expand...

I built it and it worked. The motor was about 3cm in diameter, don't remember the voltage, probably 6 volts because it was powered by batteries. The dish antenna was to float on the water, the servo kept it ponted at the satellite.

 

R

rancid rock

New Member

• Jul 6, 2006

• #11

well my motor is also very small (hence the model representation).

 

R

rancid rock

New Member

• Jul 6, 2006

• #12

i preferably wanted the most simple H-Bridge possible thanks, it only needs to move a very small and light piece of wood that will be on wheels or a rack.

 

Z

ZIGGY_DAN

New Member

• Jul 6, 2006

• #13

Does the motor need to go both ways??

If so then just use the L293D.

If not a couple of transistors will do it.

 

R

rancid rock

New Member

• Jul 6, 2006

• #14

yes well when u open a door, u would like it to close....

so yeh both ways is essential

thanks for the quik replies and the L293D is too much power, it can control a stepper motor

 

R

Russlk

New Member

• Jul 6, 2006

• #15

What are you using for a controller? a PIC micro can output 20 mA which is enuf to drive a small toy motor.