Recent content by BPNGUYEN

  1. BPNGUYEN

    ultrasonic mosquitoes repeller

    Hello every one; I would like to build a mosquitoes repeller. I did some researchs and come up with two promising circuits. One is use NE555 OpAm and can use 9 to 12V battery. The second circuit is use a phase locked loop (CMOS4047) wired as a 22kHZ osillator. The output is amplified by a pair...
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