Impedence Mismatch problem?

[jerryvdk]

Hi,

I bought a dual motor driver from robokits(Dual Motor Driver (Electronic 5 Amp). Currently Iam connecting this motor driver with a power board built by us. When i connect a dc motor which is taking more than 1A, i noticed eventhough the voltage output of power circuit board is 12V, when i measure the voltage input at the driver board is some 10V. We are connecting two boards directly with a wire(not more than 30cm) . Why this voltage drop is happening?

Is it because of impedence mismatch?
Is there any way to avoid this one?

Can anyone explain what wrong happening?

 

[gadly]

A current of 1A can easily cause a noticeable voltdrop in thin wires or across bad connectors -try to wiggle the connector or bridge it while making the voltage measurement. What the is material and cross-section of your wires - is it adequate for the current you're drawing?

 

[chuckey]

Put your negative probe on the negative output of the power unit. Then starting of at the positive terminal of the power unit follow the path of the positive rail noting the voltage drop, then from the negative terminal of the motor back to the power unit. From these figures you can see where most of the volts are going to.
Frank

 

[ankit_litoriya]

manage yr
it cud happen in starting ... may be it is becoz tentile found in wire ...