As shown, XCP 1 is a microphone. If it is a condenser microphone, two bias resistors should be added. At 19, two resistors are used to divide the voltage between power supply and ground. There is no connection in the picture, but a dynamic microphone is used here. R 16 is the sensitivity of fine-tuning microphone. When adjusting, the collector of Q9 should be disconnected at 27 o'clock, and then the resistance of R 16 should be adjusted according to the sound demand, so as to control the lighting of X 1 and X2 lamps. In the figure, the sensitivity decreases when the resistance value of R 16 increases, but it is the opposite when it decreases. The product of R3 and C 1 determines the length of the delay, and the resistance of R 1 and R2 must be accurate enough to meet the following calculation formula.

The delay formula is R3*C 1*3=t,

T is time, only seconds s(3 minutes = 180 seconds). The unit of R3 is ohm ω, and the unit usage of C 1 is f.

The light in the picture is a photosensitive resistor, and its resistance value may not be 10K. Its function is to stop the light from shining during the day and make the light shine at night. In order to have this function, R2 1 needs to be adjusted. The ground voltage at 23 o'clock above R2 1 should be higher than 5V during the day and lower than 5V at night. You must decide the size of R2 1 according to the change value of photoresistance during day and night.

The operational amplifier IC can also be replaced with other ones, and the triode is better to use 2N555 1, because different triodes have different magnifications, and the resistance of their bases has been calculated according to the magnifications. If other transistors are used, the whole circuit may not work, but this is not absolute. You can have a try.

Its general function is: the lights don't turn on during the day, and the voice control function is lost. At night or in dark places, it will have voice control function. As long as the sound is still there, the light will continue to shine. If the sound stops for more than three minutes, the light will go out at the moment when the sound stops, and then shout again, and the light will go out after three minutes.

Small request, can I have another 20 points? ? I drew this picture very hard!

If the picture is not clear, contact me again.