Sound excitation switch working principle diagram The sound excitation switch works, this circuit can be used as a sensor for the burglar alarm, and can also be used to open the * recorder to record the conversation. Adjust R8 to achieve the required sensitivity. LM339 is a four comparator, the first part A1 is used for amplification and detection, and the gain is 100; A2 compares the DC output of A1 with the reference level selected by R8, and its output can trigger Q1 to generate 200mA load current, and Light up the LED.
An electrical appliance used to protect electrical equipment from high transient overvoltage hazards and to limit the duration of continuous flow.This term includes any external clearance necessary for the normal functioning of the appliance during operation and installation, whether or not it is a unit as a whole.
Surge protector, also known as lightning arrester, is an electronic device that provides safety protection for all kinds of electronic equipment, instruments and communication lines.When the electric circuit or communication lines or for outside disturbance suddenly produce peak current in voltage, surge protector in a very short time conduction tap, to avoid surge damage to other devices in the circuits.[1]
Surge protector, suitable for ac 50/60 hz, rated voltage 220 v to 380 v power supply system, the indirect lightning and thunder and lightning directly affect transient over voltage surge protection, or other applicable to the family home, the third industry and the surge protection industry requirements.
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