Bennuhp

Function introduction:  The colorful Christmas tree kit consists of two light boards and one light board base, which form a tree-like shape. The colorful LEDs on the edge of the two light boards alternately flash like water, automatically changing seven colors, at night. It looks radiant and illuminates the surrounding environment. It has a beautiful effect and can create a pleasant atmosphere. This kit is very capable of exercising the welding ability, suitable for practical training hands and enlightenment exercises for electronic production. It is a very good choice whether it is used for self-appreciation or as a gift. Circuit principle:  18 LEDs are divided into 3 groups. When the power is turned on, 3 triodes will contend for conduction. However, due to the difference in components, only one transistor is turned on first. It is assumed that Q1 is turned on first, then D1 -D6 is lit. Because Q1 is turned on, its collector voltage drops so that the left end of capacitor C1 f

Features: The electronic clock adopts the principle of digital tube display design, adopts the design of plug-in components, and has high success rate. Contains six time animations to effectively show time and features. The LED flashing light contains four offline animation display modes, and the lighting effect is very decorative, which brings a good aesthetic to the home and the table. The electronic clock is alternately displayed with time and temperature, with precise travel time and power-off memory travel time function. With an alarm clock function, it can be turned off. With light control function, it can automatically adjust the brightness according to the environment. Circuit principle: Using the single-chip microcomputer as the main control, the DS1302 travel time chip provides an accurate travel time clock source, and combines the digital tube and the LED light to display the specific time value. Combined with the temperature light intensity detecting element, it i

Function: The Lucky Turner is a tool that first predicts where the disc will stop when it stops. Can also be used as an estimate number game, electronic dice, lottery machine, etc. The electronic lucky turntable achieves the same function electronically. This kit configures 10 LEDs into a circle. When the button is pressed, each LED rotates in sequence. At the beginning, the flow speed is very fast. It looks like all the LEDs. As if all flashing together, the flow speed will be slower and slower, and finally stop moving on a certain LED. If the last LED is the same as the player predicted, it means "winning". Circuit principle: The circuit is mainly composed of a pulse generator and a decimal counter circuit. The pulse generator consists of NE555 and peripheral components. The multi-vibrator is composed. When the button S1 is pressed, Q1 is turned on, and the NE555's 3 pins output pulses. The 10 outputs of the CD4017 alternately output high-level driving 10 LEDs

Features: After the kit is successfully produced, as the music or other sounds sound, the five LED lights follow the rhythm of the sound (the speed of the sound) and move. It can be placed near the sound, you can feel the beautiful melody combination of sound and light, let the light dance with music! Circuit Principle: The voice-activated LED melody lamp circuit is composed of a power supply circuit, a microphone amplifying circuit and an LED lighting indicating circuit. The power source is input by J1, and the C1 filter is used for the circuit. The MIC1 converts the sound signal into an electrical signal, which is coupled to Q1 by C2, and the amplified signal is sent to the base of Q2. The LED is illuminated by Q2. The louder the sound, the higher the brightness of the LED. 元件清单： Common Problem: 1. LED positive and negative poles are not noticed, long legs are positive. 2. The three resistors are not soldered according to the marking on the board.