Voice-activated music lantern circuit (1)

The characteristic of the voice-activated Zhanle lantern is that it needs any wire connection with the audio equipment, and the direct use of sound wave
control can make the lantern flash with the music played by the speaker, so it is very convenient to use. See the circuit diagram
2 76．
    The 220Y AC power is divided by R- and R, and is half-
transition rectified, and a DC voltage of about 3V is obtained at both ends of the capacitor
. Adjust the potentiometer Rl to make the transistor VT?
just in the conductive state. At this time, the product The gate and cathode of the thyristor VTI
are connected by the threshold of VT/. VT1 has no
trigger current and is in the off state, and the colored light E is small. H is a piezoelectric ceramic piece, which outputs jL after
receiving the environmental sound wave signal.
Corresponding electrical signal. This electrical signal is added between the base and emitter of VT2. The negative half of the signal causes the transistor to turn on, and its collector is the gate potential of
transistor VT1. When VT1 is turned on, the colored lights will light up, so the colored lights can sparkle
with the ambient sound waves .     RP can adjust the sound control sensitivity. When RP iW is small, the VTZ conduction depth is shallow, and VT2 is easy to retreat . Therefore, the sound sensitivity is high; on the contrary, during RP training, V r2 is deeply saturated and requires VT. To exit conduction, a larger signal input needs to be input on the base, and the sound sensitivity is low.     VT1 is suitable for use, Nfij 6 5. M(:RiO.-S type and other small plastic-sealed one-way gate tubes. VT2 uses 9013 type and other silicon NPN three-turn tubes, mouth ≥ 100. VD can use 1N4148 silicon switch two-turn tube. B is F'T- 2 7. HTD27A-1 is connected to the equal piezoelectric ceramic piece.     Debugging: Turn on the power, and when the RP m is adjusted to a certain position, the colored light E will be on and off. Then adjust the RP slightly and then adjust the color. The light is just extinguished. At this time, it is the critical state to control the high sensitivity, and the colorful lights will sparkle with your laughter or the sound of music in the room. During the test, it was found that RP example fr l; A value is the largest , the colored lights are still on and off. At this time, nJ can be solved by appropriately increasing the resistance value of R. or changing the magnification factor p value to _J/'s VT2. If Rr is reduced to the minimum, the colored lights are still adjusted If the brightness is small, you can increase the resistance of N appropriately or replace it with VT2 with a smaller value. Until RI is small, the light can be on. It is charged, and the debugging must be safe. When replacing the unit, the power must be cut off .     After passing the debugging, install the device in the small material box. In order to improve the sensitivity of the voice control , place it on the surface of the box. Each one is ≠ 2.mm. Use 002 glue to stick the electrical ceramic piece to the hole in the box from the inside of the case to the outside . In this way, the case can function as a megaphone, which can improve the sensitivity a lot. When in use, place the controller near the speaker box of the audio equipment, and deleting the electrifier RP can make the colored lights flash with the rhythm of the music played by the audio equipment.