Homemade wireless video doorbell circuit

Published:2011/7/26 2:14:00 Author:Christina | Keyword: Homemade, wireless, video doorbell | From:SeekIC

Figure 1 is the outdoor circuit, AN1 and AN2 are the buttons of the doorbell, when the guest presses the button of the doorbell, one channel of the power supply supplies the power to the coding launch circuit through the AN2, the coding launch circuit outputs the 315MHz coded signal, at the same time the power supply charges the 10μF timing capacitor through 1N4148. Another channel of the power supply supplies the power to the delay circuit through the AN1, the relay gets power to close, the contact point J-1 closes to protect itself. And the LM386 forms the voice pick-up circuit, the video camera and the 2.4GHz transmitter module all get power to work, the transmitter module outputs the high frequency signal which is modulated by the AV signal.



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