The circuit is designed for DC 12V motor and has been tested with miniature drill BOSCH MBM04. Because they can take motor from the source of higher currents, it is appropriate their drive speed pulse while maintaining maximum Tension....Electronics Projects, NE556 Speed controller Circuit DC Motors "motor control circuit, motor driver circuit, " Date 2019/08/04
The circuit is designed for DC 12V motor and has been tested with miniature drill BOSCH MBM04. Because they can take motor from the source of higher currents, it is appropriate their drive speed pulse while maintaining maximum Tension. Unlike speed control by changing the voltage it has a pulse-width application modulation advantage lower power loss on the regulator end element while maintaining engine torque. Ours the device operates at about 30 kHz.
The primary side of the transformer is protected fuse PO1. From the exit the transformer, the AC voltage is rectified diode bridge D2 to D5 and beyond the DC voltage is filtered by the capacitors C10 and C11. Other filtering the elements in the power circuit are L1 coil and C6 and C7 capacitors to prevent intrusion of high frequency pulses into the IO2 stabilizer input. From the exit the IO2 stabilizer type 78L08 is powered double timer IO1 type NE556.
Schematic Diagram Speed controller Circuit
After the PCB is installed, check it the side of the connections, whether tin bridges between links especially in the area of power supply. Distances between power supply wires it must be at least 5 mm. Potentiometer P1 dial to the left, trimmer P2 to the right. Connect DC to the output 12 V motor (polarity required, the direction of rotation) and connect AC supply voltage 230V / 50Hz.
ATTENTION! We are now working carefully for compliance all safety regulations! Turn potentiometer P1 slowly up to the rightmost position, and must the engine speed increases. Then turn the P2 trimmer slowly to the left (potentiometer P1 must be in the rightmost position) until it reaches a marked position the speed of the motorcycle. Then with trimmer, turn to the right until the maximum speed is restored and leave the trimmer in this position. It is appropriate trim the trimmer with varnish (eg varnish nails) to ensure its position. In this way, we made the settings frequency in conjunction with the output length pulse of a monostable circuit. Finally, unplug the power supply.