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FM Receiver is a compact tunable lying in the range of 88 to 108 MHz with audio amplifier. The FM Receiver described here uses very economical and high quality receiver IC. This receiver covers FM range 88MHz to 108MHz. The IC integrates the following functions :
The detailed circuit diagram is shown in figure.
About the Circuit : The circuit is divided into two parts as FM section and Audio Amplifier section.
FM Section :
AF Section :The AF section consists of IC1, which is low power audio amplifier IC specially designed to deliver 1 to 8W output power at 4W load at 12V input supply. The output of this amplifier exhibits low distortion and low noise. The input is fed at pin3 of IC1 through variable pot P1 to control the input signals to the amplifier. The output is taken from pin7 of the same amplifier.
PCB Fabrication :All the inductors are hand-made. The coils are wound closely so that there is no gap between the turns. The end of the coils L1/L2/L3 should be scratched off with the help of a blade or an iron scrapper so that the enameled cover is removed. After winding these coils, you may find it difficult to wind the IFT but it becomes easy after gaining some experience. The construction details of the inductors and IFT are given in TABLE.
Dilip Bhoyar (Elektrokit)
Keshav Imperial,Shop Nop B-101,B Wing First Floor,Nagpur, , Shani Mandir, Near Shani Mandir, Sitabuldi, Nagpur-440012, Maharashtra, India, Shankar Nagar
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