Feature: 1. MAIN FUNCTION: 12VDC ultrasonic suspension learning kit, the welding project runs in the air at a frequency of 40KHZ, and can catch light objects with a density of 2‑3MM, such as foam balls. 2. SIMPLE WELDING: This DIY kit adopts a simple circuit, which is perfect for beginner to familiarize themselves with electronic components, learn welding techniques, and understand the circuit working principle. 3. WORKING PRINCIPLE: After the kit is powered on, the object is subjected to sound force at the standing wave contact, overcoming gravity and ultimately achieving suspension, the user needs to provide a 12VDC power supply. 4. EXCELLENT PCB: The ultrasonic suspension kit uses excellent PCB board, with stable and reliable performance, convenient operation, and can be used with confidence for electronic experiments. 5. APPLICABLE SCENE: This DIY ultrasonic levitation kit is suitable for parent child activities, electronic experiments, etc., to exercise welding skills and understand ultrasonic standing wave levitation. Specification: Item Type: Ultrasonic Suspension Kit Material: PCB Working Voltage: DC 12V Working Current: 0.5A-1A Suspended Object Diameter: 2-3mm / 0.08-0.12in Working Temperature: -20℃-85℃ Working Humidity: 0%-95%RH. Package List: 2 x PCB Circuit Boards2 x Ultrasonic Generator4 x Copper Standoffs4 x Support Feet1 x Power Connector1 x Capacitor1 x Resistance1 x Diode2 x Capacitors9 x Screws3 x Chips6 x Foam Balls (Random Color) Note: 1. The foam in the set is relatively round and slippery, and it is easier to suspend after kneading for experiments.2. Spare parts need to be assembled by themselves. Before welding, check all parts according to the instructions, and then weld according to the instructions.3, ultrasonic transmitting head is relatively fragile, afraid of vibration, so as soon as possible to avoid falling; After the probe is done, the pin can not be cut. If you want to cut it, do not cut it at once. Please cut it slightly with diagonal pliers, and then shake it left and right.4. Hold the foam ball with tweezers and place it in the middle of two probes, and then remove the foam ball from the tweezers with a wire.