Making full channel FM receiver

This article describes the receiver with only one manifold and a supply voltage of +5 V compact tuner, low power consumption, easy to carry out , truly a pocket of the receiver . As shown in the drawing works , high-frequency signal received by the antenna for amplifying and mixing, the sound IF signal is generated after the end of the mixer output IF1 from 31.5MHz into the IC ( 12 ) feet. After IC amplified with the second local oscillator mixer 42.2MHz , 10.7MHz second IF signal generated by the three-terminal filter 10.7MHz filter into the IC (17) feet , and then put the IC , after demodulation, enter Ic (24 ) feet , and finally after Ic internal amplifier drives the speaker work . LNB power requirements of the machine also uses a boost circuit by the transistor 2SC8050 and composed of high-frequency transformer to provide work and tuning voltage . As a result of the low voltage power supply tuner . Its supply voltage can get low, the supply voltage can be proved to work around 3.6V, available three AAA NiMH rechargeable battery or a 3.6V lithium battery.

Component Selection : Choose LNB is critical to the machine , you should use high sensitivity, low voltage power supply , small whole additional tuner TDQ36-5V, leads to the terminal name and TDQ36-5V voltage as shown in Table 1 . Note that the tuner has two signal outputs , IF2 not. Only IF1. IC selection of Japanese production company Sony AM FM radio ASIC CXA1O19, where only the FM section , which uses a 28 -pin dual in-line package, the pin functions are shown in Table 2 . CXA1019 fully functional , including the full circuit AM FM radio , with fewer external components , low power consumption , high sensitivity , low distortion and so on. Tuner w selection 100kΩ potentiometer multi-turn precision potentiometer , tuner with VT and indirectly have a miniature digital voltmeter to display the machine receiving frequency , so as to achieve the miniaturization of the machine . High-frequency transformer B1, B2 oscillating coil selection in the week TRF1445, B1 without modification , B2 removed circle. The remaining elements can be miniaturized as much as possible .

The machine debugging is very simple, just adjust the B1, B2 can be the difference between 10.7MHz IF signal. The rod antenna receiver just add on to an ordinary radio receiver to a nearby FM radio and television all audio signals.

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