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CF210SP AM/FM Stereo Radio Kit DIY Electronic Assemble Set Kit For Learner

Product Description

CF210SP is a new type of radio FM, AM two band radio, the FM band using the CD9088 chip, which uses patch element SMT package, the receive frequency range of 76-108HMZ, not only to accept the FM radio, can also receive campus radio and part of the audio signal of the television stations; AM band using direct IC the TA7642, receive frequency range is 525-1605KHZ circuit is simple, assembly success rate, a better selectivity having a little;. amplifier circuit using TD2822 special function ICs having loud. Sound quality is good.
Circuit works
1. Frequency Modulation (FM) section
CD9088 is a dedicated single-chip FM radio chip,
Its simple external circuit, the circuit was built frequently 70KHZ phase locked loop system, selectively implemented by active RC filter, mute circuit can be suppressed non-IF signal and the IF signal is too weak.
FM signal input circuit rod antenna C8 / C10 and L1 IC1 11, 12 feet into the mixer circuit, local oscillation circuit uses a variable capacitor CA / L2, etc. vitality can be achieved manually tune.
Circuit R2 / C2 to squelch circuit, 3 feet to the audio loop filter capacitor C4. Indirect C13 6,8 feet of the intermediate frequency feedback capacitor, 7 feet is connected to C14 was the low-pass capacitors,
between C17 of 8/9 feet is IF coupling capacitor , 10 feet connected to the C12 is a limiting amplifier low-pass capacitors, 13 feet connected to the C6 of the limiter offset voltage capacitors.
2. Amplitude modulation (AM) section
AM band using Direct IC TA7642, TA7642 IC has 10 transistors internal composition, its appearance uses encapsulation mode a TO-92,1 feet grounded, 2 feet input , 3 feet output. Audio signal output from 3 feet, through R6 / C18 is coupled to the input of the power amplifier IC TDA2822 the power amplifier, pushing the speaker working. 

 

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We ensure our products work normally before post.If the products is broken before arrival to you,all you should do is taking a photo to show us our broken product.We promise to payback 100% of your money.

 

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All items will be shipped within 1~2 business day after payment. by China post or Singapore post or HK post,
   
Order valus more than $25, we provide free tracking number, order value less than $25, customer need to pay $2 if need tracking number
 
Ship to address provided by ebay if no special notes from buyer .
Delivery Time: Normally, It Takes About 10-30 Business Days to Arrival for most countries.
5-14 days to USA.
10-25 days to Australia / Canada.
14-30 days to major cities in Europe .
4 - 8 weeks to Italy , Brazil ,Russia.
 
However, it may delay due to industrial strike action, severe weather, custom reasons or peak seasons
 
we specialized in international business for more than 8 years We are professional in international business.
 
We work with Reliable international post service company.we can make sure you can get your items in time
 
We package every parcel very carefully. All items will be tested before shipped.We promise you will get your items in good situation.We seek for long term .
 
Mian business
We selling items with high quality and best price .We mainly selling ICs, electronic component ,electronic modules. PCB board etc
 
We also have customer to find other items that do not selling in our store .pls contact us if you need ,we can always provide the best price.
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