LC72131 Phase Locked Loop Experiment
Автор: 6p1p
Загружено: 2016-01-24
Просмотров: 2393
Описание:
I have this FM tuner from remove non function DVD,VCD FM player combo.
The FM tuner label Li Da Radio/Tuner , LD-936 FM/AM .
I cant find any MW antenna loop i think it only have FM.
I using STC12C5A60S2 8051 clock at 28Mhz. To set the LC27131 . The DMM show the Vctrl to tuning diode. The FM receiver chip LA1823A . The LC27131 Output pin also control the muting of LA1823A. it need to enable before the LA1823A can work. and the Vcrtl also set Local oscillator and FM RF antenna input filter. The yellow board is another radio i make, I'm using that board audio amplifier to drive the speaker.
When press the sw , the PLL will increase 50Khz per step.
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