mindoverflow
Member
Hi,
I made a motor controller (double full H.bridge). When I power it over an amp meter (DMM) the mosfets runs cool up to 6.5 A, but when I connect it directly to the power supply it functions well but the mosfets heats much (less than 10 sec) even at 0.5-1 A to the point that it burns the finger tips.
Then what's wrong about this ? What is happening inside the amp meter that doesn't happen when connected directly ?
The power supply is a 12V AC transformer, Diode bridge, 0.1uF and 2 x 2200 uF capacitors. part of the h-bridge is this:
Thanks.
I made a motor controller (double full H.bridge). When I power it over an amp meter (DMM) the mosfets runs cool up to 6.5 A, but when I connect it directly to the power supply it functions well but the mosfets heats much (less than 10 sec) even at 0.5-1 A to the point that it burns the finger tips.
Then what's wrong about this ? What is happening inside the amp meter that doesn't happen when connected directly ?
The power supply is a 12V AC transformer, Diode bridge, 0.1uF and 2 x 2200 uF capacitors. part of the h-bridge is this:
Thanks.