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Posted by nza0104 on October 17, 2010, 8:59 pm

I would like to control 2 motors, one is 6V and 740mA and another one is 5V 200mA. But my I/O board (digital to analog converter) can only give up to 10V and 5mA and the motor manufacturers do not provide any motor drives. May I know how can I drive this motors using SCB 68? Do I need a power amplifier? Can you recommend a specific power amplifier or any other alternatives? Soon I will also need to control the motors using PID or any other control algorithms.

I've tried to construct the power amplifier using TBA820M as in the Fig. 2 in the attachment: Vin is a 12V voltage supply and RL is a 1k ohm resistor, but it does not work. Instead of amplifying the power, the voltage and current across RL is almost zero. Or does it work with only AC input?

What should I do? Or is there any better alternative to drive the motors? If I need to buy a ready made amplifier, which amplifier is suitable?

Thank you very much for your help.

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