I have a problem testing the DC Motor Controller,please help if you can! Answered
Hi! I want to build a robotic arm for a project,but I got stuck while testing the motor driver on the breadboard.
I have followed the instructions from this instructable: http://instructables.com.mevn.net/id/Easy-DC-Motor-Controller/ and I connected the pnp transistors the right way(the author confirmed in the commentaries a long time ago) and also like in the diagram.
The problem is that when i turn the power on to the circuit,the motor starts to spin(slowly but it has a snail gearing reducer) and the first mosfet is getting very hot very quickly and also if I try to control the circuit by touching the first contact with a positive voltage it doesn't do a thing.I even tried doing only half of it.
I tried to reassemble it again many times,changed the transistors with other new ones,checked the connections and after numerous voltage measurements I concluded that the problem is that when I am powering up the circuit for some reason between the pnp collector and ground there is a 12v voltage and the voltage continues all the way to the resistor to the far left,although at the resistor the voltage is dropped to about 7v.
I also simulated the circuit in proteus before i bought the parts(i need 6 good working drivers) and it worked fine.
It may be a stupid mistake,but please help me if you have any idea what the problem might be!