Electronic watchdog principle circuit diagram
When the electronic watchdog approaches, the dog will be called "Wang, Wang" and the two eyes will flash. When someone approaches, when the infrared beam is blocked, the receiving circuit has no audio signal input, and VT2 and VT3 are turned off. At this time, DW1 breaks down, VT4 is saturated, and the SCR is triggered to turn on, turning on the power of the audio circuit. The shit circuit uses the KD-5608 integrated block of the analog dog, and its audio signal is amplified by an integrated amplifier LM386 to push the speaker to make a loud dog bark; all the way to the power switch circuit TWH8778, driving two bulbs, emitting a flashing Bright, simulates the dog's two eyes.
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