- 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.
- 1 x AM FM radio kit