ULN2003 bridge!
Brand new circuit that you will fin nowhere on the internet.. he he cos i found this out. Well runnig DC motors for a robot you can very happily use this low cost circuit that using a L293D for Rs175!! in this circuit i have put a H-Bridge circuit with u ULN 2003 Ic that costs just 12 bucks
okie now i assume the circuit is very easy to understand.. A" and B" are the two control signals.. givin a high to any one of them wil make the motor move in one direction while a signal to the other will mover it in opposite direction.The main asvantage of this circuit being that you can adjust the voltage applied to the motor by cahgig the sypply at collector of the BC107.(sorry people for not puttin " >" at the emitter. assume it to be down!!) i almost got my recor torn by my techer for not putyting the arrow at the emitter in my secon semester of college!!!
This sircuit will come very handy. Use it and give me feedbacks!!
Robotics » Blog Archive » Transistor as a switch said
[...] ULN2003 bridge! [...]
Al said
Hello,
I’m trying to implement this circuit to drive a floppe drive stepper motor (4-wires, bipolar). I’m confused on how to connect the wires to the outputs. What are the blue and red lines (wires) for?
Thank you
Al said
Also, where do I connect the ground?
madan said
red and the blue wires are just the two connections.. just to distinguish i put diff colors. and ground the 9th pin
madan said
ground it in 8th pin sorry.
James said
I implemented your cicuit but the output that I get at the emitter (namely A and B) isn’t the voltage I put in at the collector (not 10V) but the input at the base (but 5V).
madan said
Sorry james , just do these changes to the ckt to get what u want.
1)just ground the base
2)Connect the points A and B to the Collector itself.
3)You’l get 10v then but with a negative logic.
Try it out and comment back for any help k.
Knight said
Confused with the line in blue and red..The blue and red line is a wire to feed back??mind to verify??kinda lost at this part..
john king said
I think pin9 should go to positive of power rail to clamp the collectors from high voltage spikes generated by the motor inductance on turn off.
Knight said
yup…not same with the other page…^^
Karan veer Singh said
hey, i must tell u that a new Ic is available in the market to be used in place of h bridge..that also help to save
bridge from burning up due to software faults…
madan said
@Karan
Pl drop in the IC number here. Thanks
Karan veer Singh said
Madan the IC no. is L293D.
Karan veer Singh said
Madan the IC no. is L293D.
Regards..
Karan Veer
madan said
@Karan
Well thanks for that. But the whole purpose of this ckt was ,
1) Cheaper
2) Run motor at any voltage level
3) Increase the current rating by piggy back’in ULNIC
And a better IC than L293D would be L298 to support higher ratings.
Cheers
Karan veer Singh said
thanx for info…madan
noor said
thx for this good idea
plz can u tell me whats number of bjt transistors must connect at 12v coz i use dc motor of 12v
sunith said
hi,
im new to stepper motors and pic 16f877, im doing a project using two stepper motors connected to one pic, can you plz guide me, can u plz send me the ciruit using uln 2003 or l298 for the interfacing part for stepper motor… plz send me the circuit plz guide me
sunith said
my mail id is r.sunith@gmail.com
krishan said
hi,
i am making project on directing robot/motor using matlab by capturing the images through webcam. i have read ur article regarding it, but i was unable to see its pics. please send all info about it.
thank u 4 everything u provided, it is a good effort.
Adi said
where is the circuit ????
Pavan Kumar said
Where is the circuit???? Pls some one atleast tell me how the connections are or where i can get the circuit
Thanks
Satish Sinha said
hey!! plz post the ckt
Oisik said
Please help me , the circuit diagram is not shown in my screen
vader108 said
Please mail me the circuit diagram.
sithlordvarun@gmail.com
Is UCN5804B better than ULN2003 for driving stepper motors ? ?
zah said
oh… then how to connect UCN2003??
xxx said
Fuck you man! where the shit is the circuit diagram ? you Asshole.
Exsomzfv said
N3I48v comment2 ,
simon said
your link to the schematic is dead
madan said
I am updating the site soon into a new domain. Kindly bear with me. Regards – Madan
Albin Mathew said
Hi
I am doing a project of interfacing three stepper motors,which are presently controlled by switches through its driver circuits(quite old) to a computer.could u plz provide me with the circuit diagram.
Maldito Raton said
We cannot see the above diagram. Please, can you fix it? Thanks.