![](https://www.electronicsforu.com/wp-contents/uploads/2016/12/Screen-Shot-2016-12-24-at-15.19.33-e1644389186872.png)
Here is a simple FM radio receive which is built around 18-pin IC AN 7223. You can tune to frequency around 88.00MHz-108.00Mhz from this FM radio receiver.AN 7223 can be easily purchase in a market and it cost is not expensive. Most FM radio was works on 10.7MHz IF frequencies and uses 10.7MHz IFT coil and 10.7MHz Ceramic filters. As a 10.7MHz IFT coils are not found easily. So, here i use 5.5MHz IFT coil and 5.5MHz ceramic filter which can be easily available.
![](https://www.electronicsforu.com/wp-contents/uploads/2023/10/AN-7223-Scematic-Circuit.jpg)
Circuit Description
Only one NPN transistor BF494 and one Intergrated circuit AN 7223 (18-pin) are used in this circuit. Few external components like coil, 5.5MHz IFT coil,5.5MHz ceramic filter, resistors, ceramic capacitors, trimmer capacitor (2-22pF) were used.
Capacitor C1 (100uF/25V) is connected to ground with its negative terminal and positive terminal to pin 5. Capacitor C2 (4.7uF) is also connected to ground with a negative terminal and positive terminal to pin 6 of AN7223.
Capacitor C3 (203) is connected between pin 8 and pin 9 of AN 7223.Capacitor C4 (203) is connected to pin 9 of AN7223 and ground. Pin 11 is connected to ground.
Pin 12 of AN7223 is connected to +6Volts through a 5.5MHz IFT coil. A resistor R1 (2K2) is connected between a 5.5MHz IFT coil. Pin 14 of AN 7223 is connected to +6Volts.
Pins 16,17 are also connected to ground through an electrolytic capacitors C6(22uF/25V), C7 (10uF/25V). A capacitor C6 is connected between ground and pin 17.
An audio output is taken out from pin 13 of AN 7223 through an electrolytic capacitor C13 (10uF/25V) from a 2-pin connector.
Resistor R2 (470K) is connected between a base of Q1 (BF494) and +6Volts. Resistor R (470) is connected between ground and emitter of Q1 (BF494). Coil L1 is connected in parallel with a VC1 (2-22pF) and connected to + 6Volts and collector of Q1 (BF494). Capacitor C11 (10pF) is connected between an emitter and collector of Q1.Capacitor C10 (.01uF) is connected between base and ground.
![](https://www.electronicsforu.com/wp-contents/uploads/2023/10/AN-7223-Photo-1-1024x768.jpg)
Construction and Calibration
Capacitor C12(33pF) is connected between an emitter of Q1 and to an input terminal of a 5.5MHz ceramic filter and to a pin 1 of IC1 (AN7223). An antenna of 75cm long wire is connected to a base of Q1 (BF494) through a capacitor C9(102).
After inserting all the components take a 25W soldering iron and solder all the components. Don’t insert an IC on a IC socket while soldering IC socket on zero PCB.Before we construct this radio we will make a coil L1 of 5 turns of 23 SWG wire on a 5mm air core.
Take a piece of 23 SWG wire and remove its enamel on two ends. Now take a 5mm drill bit and gently wound 5 turns of 23 SWG copper wires.
Now take a 18-pin IC socket and place it on a middle of a board. You may also use a zero PCB (5cm*7cm).
Place a transistor Q1 on a left side of a zeroboard and 2-pin connector to a right side of a zero board.
Take a 5.5 MHz IFT coil and connect it in parallel with a resistor R1 (2K2).Now connect them to a pin 12 of IC1 and +6 Volts.
For a calibration you will need a low power Audio amplifier. Here i used a LM 386 AF amplifier.
Connect a speaker and connect it an AF amplifier. Also connect a +6 Volts to an AF amplifier.
Now connect an output (2-pin connector) from your FM radio to an input of AF amplifier.
Connect 4* 1.5V AA battery or 6 Volts battery to your FM radio receiver. You will hear a hissing sound comming out from a speaker of an Audio amplifier.
Gently tune a VC1 trimmer capacitor or adjust a coil L1 by pulling towards. You will hear many stations.
Adjust a core of 5.5MHz IFT coil until you hear a clear station coming out from your FM radio.So, your FM radio is working and ready for listening.
![](https://www.electronicsforu.com/wp-contents/uploads/2023/10/Schematic-PCB.jpg)
Parts-List
Semiconductors |
Q1: BF494 |
IC1: AN7223 |
Resistors |
R1: 2K2 |
R2:470K |
R3: 470 |
Capacitors |
C1: 100uF/25V |
C2:4.7uF/25V |
C3, C4:203 |
C5: 223 |
C6: 22uF/25V |
C7:10uF/25V |
C9:102 |
C10:.01uF |
C11:10pF |
C12:33pF |
C1310uF/25V |
X1:2-pin 5.5MHz Ceramic filter |
T1: 5.5 MHz IFT coil |
VC1: 2-22pF Trimmer |
Micsellaneous |
2-pins connector |
8-pin IC socket |
5cm*7cm Zero PCB |