Speed ​​control system with current negative feedback

Another improved solution is to introduce the current feedback signal at the summing point of the error amplifier
and add a current feedback loop. See picture for this plan. In the L292 circuit , the current proportional to the average current of the motor flows through the external circuit
between pin 5 and pin 7. As shown in the figure, the sample is sampled from the 510fl resistor, amplified and adjusted by an operational amplifier, and then sent to the error amplifier . 2 feet. The feedback coefficient is set by the potentiometer RP. Properly adjusting RP can suppress the impact of load current on speed.