Light-Controlled Music Heart-Shaped Lamp Kit, Heart-Shaped Flow LED Electronic DIY Production Parts

Description Input voltage DC 4 5V 5VAppearance size 80 69mmWeight 50gCircuit principle J1 can change the control mode When the 1 3 and 2 4 of J1 are short circuited the stronger the light the higher the series voltage divider on R7 This voltage is input to the inverting input of LM393 When the voltage exceeds When the voltage at the non inverting input terminal LM393 outputs a low voltage the transistor 8550 is turned on the music chip and 18 LEDs are energized and begin to sound and flicker cyclically J2 is the passive buzzer power supply switch and the jumper cap of J2 is removed and it is in a mute state Transistor 8050 is a power amplifier After the audio signal of the music chip is amplified by the 8050 side it drives the buzzer to sound on the contrary if it is connected to pins 3 5 and 4 6 of J1 respectively the darker the light the voltage across the resistor R7 The higher this is the dark control The adjustable resistor R10 can adjust the voltage of the non inverting input terminal so that the circuit responds appropriately to the light intensity and avoids excessive high and low The resistors R2 R4 and R6 are the current limiting resistors of the light emitting diode Since LEDs of different colors have different conduction voltages only one set of color LEDs can be placed in the same group For example D1 6 has only one color LED If the colors are matched high voltage conductive LEDs will not emit light The conduction voltage of th