How to make music cards for primary school students

Card paper with circuit collage printed on it, conductive tape, batteries, music transistors, light-emitting diodes, and speakers.

Process:

Add conductive tape along the circuit tiles. The end of the conductive tape used to make the switch should be folded so that both upper and lower sides are non-adhesive surfaces with good conductivity. It functions like a metal sheet and can be used as a key switch.

Paste the key switch to the corresponding position, paste it to the left along the circuit diagram, put the battery into the circle on the left, and connect the negative electrode (lower surface) of the battery to the conductive tape below. The end of the tape connecting the positive terminal (upper surface) of the battery should also be folded into a small section so that the non-adhesive surface with good conductivity is connected to the positive terminal of the battery. ? The main component of this circuit is the "music triode". Its shape is the same as an ordinary triode. Looking at the side with words, counting from left to right, the leftmost pin 1 is connected to the negative pole of the power supply, pin 2 is connected to the positive pole, and pin 3 is the output. Signal. Its pins should be bent as shown on the right side of the picture below, pin 1 is folded forward, pin 2 is folded back, and pin 3 is folded to the right. Place the music triode in the corresponding position. After the LED pin is bent, the positive electrode is connected to the positive electrode of the power supply, and the negative electrode is connected to the output of the music triode. The long pin of the light-emitting diode is the positive electrode. You can also look inside the "small glass bubble". The small electrode corresponds to the positive electrode. Use a small piece of tape to tape the electronic component pins into the circuit, pressing firmly with your fingers. Adjust the angle and elasticity of the key switch, and this homemade flashing music greeting card circuit is completed.