2results about How to "Simple application circuit" patented technology

This utility model discloses a high-precision digital sensor keypad switch keyboard, characterized by: including a PCB board, on which at least one digital magnetic sensor keypad switch is disposed; and on which a digital magnetic sensor is disposed, capable of linearly and accurately detecting the change in magnetic flux in the Z-axis direction caused by the height difference of the permanent magnet within the keypad switch, and quantifying it into a digital sample value to generate a high or low level digital signal output. The digital magnetic sensor and the keypad switch are configured in a one-to-one correspondence. The purpose of this utility model is to overcome the shortcomings of the prior art and provide a digital magnetic sensor keypad switch keyboard with a simple structure, low cost, effectively reducing the wobbling amplitude during the keypad's movement stroke, high triggering accuracy and reliability, relatively low frictional resistance, good tactile feel, and ultra-low latency.

The utility model relates to a kind of multifunctional electromagnetic buzzer drive integrated circuit, including EN enable control circuit, DIN external signal control circuit, RC oscillation circuit, counting frequency division circuit, OUT output drive circuit, anti-peak absorption circuit.It can control high-precision RC oscillation circuit work by EN enable control circuit, after counting frequency division, drive circuit OUT exports fixed square wave signal, DIN can additional input signal, make output signal follow input signal;The anti-peak absorption circuit is connected with output drive circuit OUT.The utility model multifunctional electromagnetic buzzer drive integrated circuit is simple, in addition to itself can generate fixed drive signal, also can be controlled by single-chip microcontroller to enable EN enable port and DIN external signal input port, through software algorithm, can make buzzer produce continuous sound, various drop drop sound and various sound effect prompt sound, use more widely and intelligent.