Voice control circuit 1:
The voice control power socket comprises a power socket, a power plug and a voice control circuit board. When in use, insert the plug of the socket into the ordinary power socket, and then insert the plug of the household appliance into the power socket, close the switch of the appliance, and then use the sound (such as clapping the palm) to control the opening of the appliance. If you want to turn off the appliance, clap the palm of your hand and the appliance will turn off. In Figure 1, D1-D4 is connected to bridge rectifier circuit. It and SCR s form the main power supply circuit of socket CZ, D5, R1 and C1 form half wave step-down rectifier circuit, R3, R4 and RP form voltage divider, so that the positive terminal voltage of C1 is about 4V, which is used for six phase inverter CD4069. RP is wh7 horizontal solid adjustable resistor, CT1 ceramic dielectric capacitor is used for non electrolytic capacitor, ft-27 or hid27a-1 is used for piezoelectric ceramic chip y, and other component parameters are shown in the figure. Except for the socket CZ and piezoelectric ceramic y, the other components of the device can be welded on the printed plate of 58mm & times; 45mm. The shell of power socket can be purchased, and the two eye (or three eye) socket on the market can be reformed. The printing plate should be able to be fixed in the socket. A dozen small holes should be drilled in the upper right corner or the lower right corner of the socket with an electric drill. These small holes should be evenly distributed in the circular range of the size of 1 yuan coin. These small holes can be used as sound transmission window holes (or the sound transmission window holes can be dug into strips). The piezoelectric ceramic chip is fixed on the sound transmission hole with 502 glue. A cover plate with a power plug (i.e The whole voice control power socket is actually a box. The outline drawing is shown in Figure 2. After all the components are installed according to figure 1 and checked to be correct, they can be powered on for debugging.
First of all, the voltage between the six inverter and the seventh pin should be about 4V, otherwise, D5, R1, C1 and other components should be checked. If the voltage is normal, you can adjust RP with an insulated small driver to make the level of CD4069 pin 8 just change to low level (it is still 4V high level at this time). At this time, blow a breath to the piezoelectric ceramic y, you can see that the level of pin 8 drops to low level (use a multimeter to monitor the voltage of pin 8), and then returns to high level (that is, a negative pulse is output), indicating that the sensitivity has been adjusted to the highest, It can be put into trial use. In actual use, the sensitivity can be adjusted to be appropriate according to the use conditions of each person, that is, it is not sensitive to the sound of conversation, TV, tape recorder, etc., but sensitive to applause. In the process of debugging, if it is found that the voice control sensitivity is too low, you need to clap your hands loudly to make the socket work. Generally, if the RP is not adjusted properly or the quality of the piezoelectric ceramic chip is too poor, you can readjust or replace the piezoelectric ceramic chip with a high impedance earphone sound film. If it is found that the on and off of the controlled lamp is not controlled by the clapping, but flashes alternately. Usually, the RP resistance is adjusted too small. Just increase the resistance. After the RP is adjusted, the adjusting driver shall be fixed with paint or wax, and then the voice control power socket can be put into formal use.