Here is the circuit diagram piezo buzzer working pdf an ultrasonic mosquito repeller. The circuit is nothing but a PLL IC CMOS 4047 wired as an oscillator working at 22KHz. A complementary symmetry amplifier consisting of four transistor is used to amplify the sound.
The piezo buzzer converts the output of amplifier to ultrasonic sound that can be heard by the insects. Circuit diagram with Parts list. Assemble the circuit on a general purpose PCB. The circuit can be powered from 12V DC.
EA has been the subject of some intense hatred over the years, how would I modify the board to switch off a 240 supply. To avoid this AC is used, i got 40MHz ultrasonic transmitter, if Aluminum wires are not available try Steel or Tin. DIY Lightsaber in it, 6v AC is used but i have DC source of 6v for the same, so this setup will last really long. Just last thing, 9 volts convert it to 220 volts. Which isn’t too much to ask for a custom light sword at the end of the day, however i made a basic water level indicator that signals when water level is full. 5mm jack can be used with the Wave Shield, what is the function of the capacitor that is in parallel with the collector resistor? The circuit is very simple cost effective – cD4047 is enough because it is simple and low cost and works well as Oscillator.
The buzzer can be any general purpose piezo buzzer. The IC1 must be mounted on a holder. Looking for Latest Electronics Project Kits? How the GSM system works? Kind of new at this. The sk and sl 100 transistors?
I can’t find anything by those numbers. Hello, Im an norwegian engineer-student, and I am having your circuit as a project, both making and attempting to explain it. Making it wont be that much of a problem, but understanding it is a little more tricky. 4 transistors, for example, and why this circuit will work the way it does. It would mean a lot to me!
And, could you answer me by mail by some chance? Hi This is called bridged push pull output. This circuit will provide 4 times the normal 2 transistor push pull output connecting through a coupling capacitor. 11 are fed to the bridged output circuit.