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Kit Purpose: 1, Suite variety of electronic components: a plurality of electronic components, resistors, capacitors, inductors, diodes, integrated circuits, headphone jack, buttons, etc., many kinds of basic components. 2, Learning electronics, practical ability. It's particularly suitable for use epoxy PCB welding students use rather than for general use paper-based board! How to use: If frequency of the circuit is designed to 70KHZ, peripheral circuits without intermediate frequency transformer, wherein the frequency is selected by an internal RC circuit IF filter to complete. Aircraft such as digital radio tuner that uses electrical tuning buttons (SEEK +, SEEK-), in addition to the volume control buttons (VOL +, VOL-) and the power button (PW). After the circuit is powered on, press the power button, the circuit starts to work, press SEEK + to search for high-frequency or low-end press SEEK- radio frequency search, automatic search for radio signals, tuning automatically stops, then click on the search button, if the circuit continues to search for radio stations. Welding Sequence: First welding SMT components, then: 1.resistor 2.Inductor 3.capacitor 4.diode 5.keys 6.headphone jack and switch button. Electronic kit (complete set of spare parts) for electronic enthusiasts assemble themselves, study electronics knowledge, experience hands-on fun, enjoy the fun of success. Kit details (schematics, circuit board diagram, parts list, circuit works described assembling step instructions, debugging instructions, etc).If you need,we can send it to you by e-mail. Package Contents: 1xWireless Stereo FM Radio Receiver Module PCB DIY Electronic Kits