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![](https://ae01.alicdn.com/kf/S2d758ee2c1b542bf997e8e9dd36b5babO/FM-FM-DIY.jpg) ![](https://ae01.alicdn.com/kf/S572747a394f94789ae7d2c9cf0e29152x/FM-FM-DIY.jpg) aHR0cDovL2ZyZWVzaGlwLmNvLmty![](https://ae01.alicdn.com/kf/S2d758ee2c1b542bf997e8e9dd36b5babO/FM-FM-DIY.jpg) ![](https://ae01.alicdn.com/kf/S572747a394f94789ae7d2c9cf0e29152x/FM-FM-DIY.jpg) ![](https://ae01.alicdn.com/kf/Sa0e00d5d4b604650b1eea0d65820942be/FM-FM-DIY.jpg)
- ±Ù¿ø: CN (Á¤Ç°)
- Áõ¸í¼: NONE
- Àç·á: Çöó½ºÆ½
- Type: Hand Tool Parts
- Origin: CN(Origin)
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Nadoway NDW183 one-pack radio assembly instructions Assembly Instructions: The NDW183 is a compact FM band radio. It is mainly composed of two IC integrated circuits, CD9088 and CD2822. The receiving frequency range is: 88MHz108MHz, which is characterized by easy assembly, high sensitivity and clear sound quality. Through the welding, assembly and debugging of wireless FM radio, understand the assembly process and manufacturing process of electronic products. The rod antenna itself senses the weak radio wave signal in the space, and is coupled through C1 into a mixing resonance circuit composed of IC CD9088 ©ñ) feet, ©ò feet and L2, C5. At the same time, foot ¨ë and L1 and C23. (variable capacitance) form a tunable oscillation circuit. The two kinds of signals provide the signal source to the IC's internal intermediate frequency amplifier through the mixer, and the intermediate frequency amplifier sets a phase-locked loop system with a frequency of 7OKHz. ¨ìPin is the IF feedback port, ¨íPin is the low-pass filter port, ©õPin is the all-pass filter port; ¨îPin is the IF output port, that is, the output of the first-stage intermediate amplifier, which enters the second-stage intermediate amplifier through C10. That is, pin ¨ï is the limiter intermediate frequency input port; Between the phaser and the audio circuit: its role is to suppress non-IF signals and too weak IF signals. (Pin ? is the ESC/AFC output port, (Note: this pin is not used) Pin 2 is the audio output port, which is connected to the volume control potentiometer RV through R4 to provide an audio signal with a certain output amplitude to the power amplifier circuit, pin 3 It is the audio filter port, the ¨ê pin is the input port of the IC working power supply. The audio signal is coupled to the CD2822 ¨í) pin input through C13: The CD2822 power amplifier is composed of two amplifiers with the same internal structure (bridge connection). C12 is a coupling capacitor, C11 is a bypass capacitor, and C24, R7, C25, and R8 are absorption loops. In the large dynamic output, the load (headphone, speaker) is made close to a pure resistance state to protect the load and power amplifier. Second, the assembly and debugging should pay attention to several issues: ¨ç Before soldering components, you must first check whether the component pins are oxidized. If there is, you must remove the oxide layer and then tin; the printed circuit board should also be checked to see if there is any breakage, or copper platinum The two lines are connected without corrosion and clean. The problematic printed circuit board must be processed before the plug-in soldering, so as to avoid unnecessary failures after assembly and soldering. ¨èWhen welding, please operate according to the principle of welding small components first, and then welding large components. The components should be attached to the bottom plate as much as possible, and the plug-in and welding should be carried out according to the component list and electrical schematic diagram. When soldering, the components should be inserted in place before soldering. When soldering, a sharp soldering iron tip should be used for soldering. If the first soldering is unsuccessful, the next soldering should be performed after cooling, so as not to burn the printed circuit board and cause the copper and platinum to peel off. After soldering, it should be repeatedly checked for false, false, leaking, wrong soldering, and whether there is a fault caused by a short circuit of dragging tin. ¨é Correctly install each electronic component, and the welding should be done in strict accordance with the assembly drawing. ¨êBefore debugging the machine, the rod antenna should be welded and pulled out. Turn the tuner to receive the radio signal. ¨ë Call out the radio signal at the low end (such as around 92MHz): adjust the L1 air-core coil to make the actual frequency of the radio signal match the frequency on the dial. ¨ì Call out the radio signal at the high end (such as about 10OMHz): adjust the trimming capacitor on the variable capacitor shell to make the actual frequency of the radio signal match the frequency on the dial. ¨í Repeat steps 5 and 6 until the frequency of the radio signal in the entire frequency band matches the frequency on the dial.
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