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This product is a new type of light-controlled music lamp kit. It is a DIY
kit. It is a single-junction transistor controllable desk lamp. It is a teaching
component and suitable for beginners to solder DIY.
Parameters:
Working voltage: If all red LEDs are used, DC 3V can be used, if the colors are
different, DC 4.5-5V can be used
Photoresistor: the stronger the light, the lower the resistance of the
photoresistor
Experimental phenomenon: 18 LEDs can be controlled cyclically flashing and music
playback according to the ambient light intensity
Instructions for use:
J1 can change the control mode. When short circuit 1, 3 and 2, 4 of J1, the
stronger the light, the higher the series voltage divider on R7. This voltage is
added to the inverting input of the voltage comparator IC1A. When the voltage
exceeds the voltage of the non-inverting input terminal, IC1A outputs low level,
the transistor 8550 is turned on, the music chip and the 18 LED loop circuits
are powered on and begin to sound and flicker. J2 is the speaker power switch,
and the short-circuit cap of J2 is removed and it is in a mute state. Transistor
V5 is a power amplifier, the audio signal of the music chip is amplified by V5;
it drives the passive buzzer to sound; otherwise, if the pins 3, 5 and 4, 6 of
J1 are short-circuited, the light will be darker and the resistance R7 The
higher the series partial pressure of. This becomes dark control. Other
connections of J1 are undefined.
The adjustable resistor W1 can adjust the voltage of the non-inverting input
terminal, so that the circuit responds to the appropriate light intensity and
avoids excessive high and low. The music chip is a positive trigger and pin 2 is
the trigger terminal. After connecting pin 2 to the power supply pin 1, the
music chip can be played in a loop. Resistors R2, R4, and R6 are the
current-limiting resistors of the light-emitting diodes, corresponding to
different colors of light-emitting diodes, R2 for red, R4 for yellow, and R6. If
the colors of the three groups of LEDs are the same, current-limiting resistors
with the same resistance can be used. Since LEDs of different colors have
different turn-on voltages, only one color of LEDs can be installed in the same
group. For example, if L1-6 is a group, L1-6 can only install LEDs of one color.
If the colors are mixed, Then the LED with high turn-on voltage will not emit
light. Red LED turn-on voltage. Yellow is higher. If the red and yellow are
installed in a group, the yellow LED will not emit light. Pay attention when
installing.
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