Simple 3V FM Radio

Friday, July 30th, 2021 - RF Circuit

The circuit of simple 3V FM radio is working with a +3 volt DC source voltage of 2 units of AA batteries. FM radio in the image below has been equipped with an audio amplifier (audio amplifier) ​​as an audio signal amplifier to drive a headphone. Basically a simple FM radio circuit is composed of 2 units of transistors and audio amplifier IC TDA7050 uses. Schematic drawings and component values ​​to create a circuit of simple 3V FM radio can be seen in the following figure.

The Circuit of Simple 3V FM Radio

Simple FM Radio 3V,Simple 3V FM Radio

The Working Principle Simple 3V FM Radio

A circuit of images above shows that the circuit simple 3V FM radio is comprised of some of this part as follows.

Part radio receiver FM built using 2 units of type transistor BF199. Both of these transistors forms a circuit of very simple FM receiver. Overall the radio receiver circuit FM is the configuration of the two transistors T1 and T2 type BF199 circuit with the inductor L and C. The frequency tuning capacitor radio receiver  FM in the image above is set using a variable capacitor (Varco). As used FM detector RC configuration C1, R2 and C2.

Audio amplifier section, in part serves to strengthen the cue information (audio signal) from the receiver circuit FM. Audio amplifier circuit is built using the IC TDA7050 given load a headphone to listen to cues such information. In the audio amplifier circuit radio receiver FM is equipped with a volume control that is used to determine the level of the audio signal that is amplified by the audio amplifier section.

The circuit of simple 3V FM radio above can be operated with the source voltage of 2 pieces of AA batteries.

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