Are you trying to build a reversible motor driver? Because with the diodes arranged that way, the current will short circuit, damaging the transistors and quite possibly affect the power supply too. Plus the motor won't run.Attached drawing shown Arduino and transistors revers able motor driver, I put two fly-back diodes there but looks not feeling very well, is that the way should be? is it right to delay between two pins shift?
Thanks.
View attachment 181785
Thanks.Are you trying to build a reversible motor driver? Because with the diodes arranged that way, the current will short circuit, damaging the transistors and quite possibly affect the power supply too. Plus the motor won't run.
What you need is an H-bridge configuration to drive the motor. Google it up.
You need to re-evaluate the entire circuit, as kubeek just said.Thanks.
Yes, I am try to make a simple bridge, a small motor, i tried test without diodes, it's OK. can I just remove the diodes?
Thank you, I used the same circuit as your picture here, except D1 - D4, don't know why it draw too much current even without trig yet. I used two 7805 convert 12V to 5 V as power supply to the bridge that become very hot. I used two BD139 + two BD140.You need to re-evaluate the entire circuit, as kubeek just said.
Here's the basic configuration of a basic H-bridge circuit, for your consideration:
Hello,You need to re-evaluate the entire circuit, as kubeek just said.
Here's the basic configuration of a basic H-bridge circuit, for your consideration:
Oh, I'm aware of all those considerations. I'm only trying here to guide the OP through baby steps.Hello,
I might add that the power source line Vcc must have an impedance low enough to absorb the energy from the motor when the motor pushes current up through the top diodes. That recycles some energy, but if the Vcc supply impedance is too high it will force the voltage Vcc up too high and thus cause something else to burn out. Remember the motor inductance makes it look like a boost converter for some modes of operation.
Usually there is adequate capacitance on the Vcc to ground buss.
What are the exact specs of the motor you're trying to run?View attachment 181829
Thank you, I used the same circuit as your picture here, except D1 - D4, don't know why it draw too much current even without trig yet. I used two 7805 convert 12V to 5 V as power supply to the bridge that become very hot. I used two BD139 + two BD140.
Sorry i did not mean to direct that post 'at' you, you just had a great schematic i wanted to include to make it more clearOh, I'm aware of all those considerations. I'm only trying here to guide the OP through baby steps.
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