Circuit working principle : The temperature measuring resistor RT is connected to the input terminal of the control gate D1. It and the resistors R1, R2 and RP are regulated by the voltage division of the RP, so that the input level of the gate D1 is high level, and the D1 output is low. level. When in use, the thermistor RT is placed on the controlled device. When the temperature of the controlled device exceeds the maximum set temperature, the voltage of the D1 input becomes low due to the small voltage of the RT. After D1 is inverted to a high level, the high level is applied to the control terminal 8 of the multivibrator on the one hand, so that the multivibrator starts to oscillate, and after being amplified by the amplification tube, the siren sound is emitted by the speaker, and is also added to The base of VT1 is turned on, the relay is sucked, and the working power of the controlled device is disconnected through the normally closed contact of the relay; on the other hand, after the D2 is inverted to the low level, the LED of the LED is formed through the light. , LED lighting instructions. Second, the choice of components IC1 selects CD4011; VD selects IN4001; VS is regulated voltage regulator 10V; VT1 selects 9013, VT2 selects V40AT; capacitor C is 2000P ceramic chip capacitor; relay is 4099 relay; RP selects 470K Ordinary adjustable potentiometer; resistors use 1/8 or 1/4W metal film resistors, BL selects 8Ω, 0.5W electric speakers. The circuit has a simple structure and is easy to manufacture. A NAND gate and a thermistor are used to form a measurement and control circuit and a siren sound circuit, and a relay is used as an execution circuit.
3.5mm Wire To Board Connectors
3.5mm Wire To Board Connectors.Standards
Wire-to-board connectors carry approvals from various national and international organizations. In North America, they often bear marks from Underwriters Laboratories (UL) and/or the Canadian Standards Association (CSA).
A wire to board connector for the European marketplace should comply with the Restriction of Hazardous Substances (RoHS) and Waste Electrical and Electronic Equipment (WEEE) directives from the European Union (EU). Wire-to-board connectors that comply with other requirements are also available.
BS 9526 N0001 - Specification for multi-contact edge socket electrical connectors.
3.5mm Wire To Board Connectors
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