Solar Crystal Light

100LEDs Crystal Ball Solar LED Outdoor Garden Christmas Decoration Waterproof String Light.

The solar lamp is charged during the day and automatically lights up at night because there is a voltage detection circuit inside the lamp, which detects that the voltage of the solar panel is high during the day, and the detection circuit outputs a control signal to turn off the lamp, and the voltage of the solar panel is almost zero at night. , the detection circuit outputs a control signal to light the lamp. Below we introduce a simple and easy-to-make automatic control circuit for solar lamps. As long as the circuit is added with a solar panel and a rechargeable battery, a solar lighting lamp can be formed.

During the day, due to the high voltage of the solar panel, the ① pin of the IC is high level, the output of its ② pin is low level, the N-channel MOS field effect transistor VT is turned off, and the LED Light connected to its drain does not light up. At night, the voltage of the solar panel tends to zero volts. At this time, the ① pin of the IC is at a low level, and its output becomes a high level. By adjusting the potentiometer RP, the lamp can be lit in a suitable light. VT can choose AO3400 SMD MOS field effect transistor in SOT-23 package.