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High and low voltage circuit breaker with delayed and music

2017-08-16 04:19  
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This article is a high voltage circuit breaker with delayed and music theory discussed. By convention, in order to better grasp the principles you are, we recommend you to combine text read schematics. When the supply voltage is normal, the DC voltage at the cathode of zener diode D4 is less than 5.6 v. Therefore, the transistor T1 is turned off. The cathode of the DC voltage is greater than 5.6 v zener diode D5 and results in the transistor T2 'state. Therefore, the relay RL1 become energetic, which is displayed green LED lights up. In the high supply voltage conditions, the transistor T1 switches "state, because the voltage at the cathode of zener diode D4 becomes greater than 5.6 v. Accordingly, transistor T2 switches to the OFF state, the relay is disconnected, at low supply voltage condition, transistor T1 switch to the off state and the result transistor T2 is switched to the oFF state, the relay to disconnect the timer circuit IC 555 is configured to run in a monostable mode. pulse width of about 10 seconds timing component values ??for the circuit. when power is restored after the break, pin 2 of the IC 555 lower, which triggers it short. whose output makes music IC UM66 operating through transistor T3. simultaneously, has also been used as a forward bias transistor T1 monostable IC1 output is connected to it bottom of the diode D8 and resistor R7. Accordingly, for the transistors T1 and T2 transistors biased off, so the relay RL1 time still being suppressed, and the load of the mono pulse voltage surge protection. adjust the preset VR1 and VR2, you might use a manual variable autotransformer set output autotransformer to 270 v AC and connect it to the main transformer X1. adjustment preset VR1 such relay RL1 just de-energises. next set of output autotransformer 170 v AC. now adjust preset VR2 so that relay RL1 de-energises again. volume control VR3 may be adjusted to the desired output volume adjustments generated by the IC  UM66 . If you're a first reading on this principle, we recommend that you carefully read several comprehensive in order to better grasp this simple but effective circuit.

High and Low Voltage Cutout with delay and Music

High and Low Voltage Cutout with delay and Music

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