555 blind person electronic guide audio circuit

Published:2011/5/24 2:50:00 Author:TaoXi | Keyword: blind person, electronic, guide, audio circuit | From:SeekIC

As the figure 16-30 shows, the voltage-frequency conversion circuit is composed of the 555 and the surrounding components, the device that can be used to determine the direction of the earth's magnetic field is one piece of Hall effect integrated sensor UGN-3501M, this sensor has a Hall unit and a linear differential amplifier, the sensitivity of this device is about 1.4 mV/gauss, in order to improve the sensitivity, we add two roots of flat magnetic bar on both sides of the sensor. The size of the IC2 output voltage depends on the magnetic field intensity of the Hall device, the output impulse frequency of the voltage-frequency converter which is composed of 555 depends on the charging voltage value of C2.



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