Programmable source powers dc micromotors


Posted on Mar 20, 2013

The circuit in Figure 1 is a simple, economic, compact, and tricky way of using the LM723 as a programmable voltage source to drive dc micromotors. Because of the µPs` accurate positioning and control, these motors are useful in applications such as optical mounts and flexible shaft control, which take advantage of the higher speed and fast movement of servo controls compared with stepper motors. These designs require a stable, programmable dc-voltage source.



The LM723 is a fixed linear regulator, but this application configures the regulator as a programmable voltage source. You can set the output to a value of 200 mV to 6V. The output, an emitter-follower type, provides low output impedance. The circuit limi




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