H Bridge motor control

I m using SK100 ,SL100 transisitors for H Bridge design...
2N222 are also getting heated....
The transistors are getting extremely heated and i m not getting the output
Can any 1 help me????

Hello santosh, sk100 is a medium power pnp transistor, since you are using motors to be driven from transistor the current requirement of motors is high may be up to 250mA.
Here are some facts about the category of transistor you are using-
Hfe = 110
maximum collector to base voltage = 30v
maximum collector to emitter voltage = 30v
maximum base to emitter voltage = 5v
maximum collector current Ic = 100mA
maximum power dissipation = 500mW

as u have taken the output across collector the maximum output current it can handle is 100mA approax. thus you are heating up your transistor.

you must go with a power transistor to drive your motors.
e.g D880 which can handle a collector current of 3A & your transistor will not be heating up!
All the best!

Can u please suggest a similar circuit to get the desired output???

The circuit that you have used is correct. Just replace the transistors with a power transistor, it will work!!

I need to replace the SL1oo and SK100 with power transistors?? right??

does the circuit work with any power transistor??

Hi santosh,

I think your circuit isnt properly design, i believe Q3,Q5 in your circuit should be PNP transistor and Q4,Q6 should be NPN.
Because of the reason both Q3,Q5 required some boost voltage in case if you use NPN and we can operate Q3,Q5 both in depletion mode if use PNP.

And your problem of "i m not getting the output" should have this reason.

Thanks,
Jagdish gundu

Yes santosh, you must replace the transistors with power transistor!
any power transistor will work, if you want you can even use a motor driver IC which has an inbuilt H-bridge the one that you have made.
e.g of motor driver IC LM 293
i have attached the IC pin description, just go through it in case you wish to use the IC.