CF210SP AM/FM RADIO KIT

Think It! Make It! Invent!
SKU: PROD0625


Specification:

Brand new
Type: Radio DIY kit
Color: As shown in picture
Radio size: approx. 100*65mm
CF210SP is a new type of radio FM, AM two band radio, the FM band uses CD9088 chip, which uses patch element SMT package, the receiver frequency range is 76-108 MHz, aside from FM radio it can also receive campus radio and the audio signal band of the television stations
AM band uses TA7642 IC, receive frequency range is 525-1605 KHz circuit is easy to assembly success rate, it also has an amplifier circuit using TD2822 IC. Sound quality is good.
Frequency Modulation (FM) section

CD9088 is a dedicated single-chip FM radio IC,
It has a simple external circuit, built with 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.
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.


Package included:

1 x AM FM radio kit