The ultrasonic remote control switch circuit with the infrared remote control mode

Published:2011/5/10 22:36:00 Author:Christina | Keyword: ultrasonic, remote control switch, infrared remote control | From:SeekIC

The sub-ultrasonic remote control switch always uses the relay to control the load, and this device has some points of features such as the good load capacity, wide range of applications, low price (6 RMB each), families have a lot of this device. But there is also a weak point: short life of the balloon rubber which can produce the sub-ultrasonic, and this balloon rubber is easy to lose. So we use the TV or VCD's infrared remote controller to control it. The principle and modification method are: The sub-ultrasonic remote control switching circuit is as shown in the figure, the circuit in the dashed box is the modified circuit, the 220V AC main-voltage is limited and steped down by the C1, the D1~D4 output the DC voltage of about 15V, and this voltage is limited by R2 then supplies to the relay control circuit. XD is the piezoelectric ceramic, the sub-ultrasound is amplified by BG1 and selected by L, C3 and then is amplified by BG2 to trigger the bistable circuit to flip through C6 and C7.



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