3.2 - 1 Amp DC Motor Controller, up to 36v

Submitted by Webbot on July 3, 2008 - 9:15pm.

There are two ways to do this:-

 

Either: use the previous 600mA circuit but replace the L293D with a Texas Instruments SN754410 which is a direct pin for pin replacement. This is the preferred solution as the chip costs 98 cents and you dont need the additional diodes.

 

Alternatively:- do the following.

 

This circuit is similar to the 600mA version except that:-

1. It uses the 'L293' rather than the 'L293D' See http://focus.ti.com/lit/ds/symlink/l293.pdf

2. This chip allows a higher current of 1 amp per motor but requires us to add the diodes at the output stage. These should be fast, ie Schottky, diodes that can cope with the 1 amp current and a reverse voltage greater than, or equal to, the voltage of your motors. The motor voltage is still limited to 36v.

 

Costs

This requires one tri-state switch per motor;

one L293 for every two motors. The L293 costs about $5.81

You will also need 4 diodes per motor. The cost of these will vary depending on the voltage of the motors, and the current, but lets say about 50 cents each - ie $2 per motor.

So about $12 in total - for driving two motors

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DC Motor Driver 1A.pdf17.52 KB