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</div> The radio-signal generated by the lightning flash is picked up by 
   the telescopic antenna with the help of a 10mH choke. The choke L1 
   resonates with the antenna and allows current to flow into the 
   receiver circuit.<br>
   The L2 of 330uH in parallel with the 680pF capacitor C1 forms a 
   tuned circuit for 300KHz. This parallel-tuned tank circuit is 
   coupled to the base of Q1 via D2. The amplified radio signal is 
   again coupled into the base of Q2. Transistors Q2 and Q3 form an LED 
   flasher circuit. Transistor Q4 is the LED driver.<br>
   The flasher is biased so that when VR1 is carefully adjusted the LED 
   flashes only when a radio burst appears at the input due to a 
   lightning flash.<br>
   
<div class="sevidatabs"> <div data-tab="Bài Viết">ere is 
   a low cost, wireless switch controller. It uses ultrasonic sound 
   waves for remote control of a switch.<br>
   As with any other remote control, the system basically comprises a 
   transmitter and a receiver circuit. Frequencies up to 20kHz are 
   audible. Frequencies above 20kHz are  not audible. The 
   transmitter circuit generates an ultrasonic frequency between 
   40-50kHz. The receiver senses the ultrasonic sound and switches on a 
   relay.<br>
   The transmitter uses a 555 astable multivibrator. It oscillates at a 
   frequency of 40-50kHz. An ultrasonic transducer is used to transmit 
   the frequency. The transmitter runs on a 9v battery. The ultrasonic 
   receiver uses a receiver transducer to sense ultrasonic signals. It 
   uses a two-stage amplifier, a rectifier stage and an operational 
   amplifier in inverting mode. Output of the operational amplifier is 
   connected to a relay through a driver stage. A 9v adapter can be 
   used to power the receiver circuit. When switch S1 is pressed, it 
   generates ultrasonic sound. The receiver amplifies the received 
   signal via transistors Q3 and Q4. The amplified signal are then 
   rectified and filtered. The filtered DC voltage is given to the 
   inverting pin of operational amplifier 1C2. The non-inverting pin of 
   1C2 is connected to a DC voltage through VR2 that determines the 
   threshold value of the signal received, for operation of relay RL1. 
   The inverted output of 1C2 is used to bias transistor Q5. When 
   transistor Q5 conducts, it supplies base bias to transistor Q6. When 
   transistor Q6 conducts, it energises the relay RL1 . The relay can 
   be used to control any electrical or electronic appliance. <br>
   Frequency of the circuit can be varied by adjusting VR1. Adjust it 
   for maximum performance. Ultrasonic sounds are highly directional. 
   So when you are using the transmitter, the receiver should face 
   towards the transmitter. The receiver is always kept on.<br>
   <br>
</div><div data-tab="Video">chưa có nội dung</div><div data-tab="Thanh Toán">chưa có nội dung</div></div>

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