Thursday, November 30, 2023

Simple FM Radio Using LA1260

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Here is a simple FM Radio using an IC1 1260.This IC is a 16-pins. All the components used for this FM radio can be easily purchased in a market or can be taken away from your old Black & White TV set, radio e.t.c.

Most of FM radios work on 10.7MHz IF frequency but this on works on 5.5 MHz IF frequency. As a 10.7MHz IFT coils is hard to find in a market we used here 5.5MHz IFT coil which can be easily find in a market and also can be taken away from your old Black & White TV sets. Also 5.5MHz 3-pin ceramic filter used for this FM radio can also be easily find in a market. 

Circuit and Working

The heart of this circuit is a transistor Q1 (BF494) and IC1 (LA1260) and using few resistors and capacitors, 5.5MHz ceramic filter and 5.5 MHz IFT coil.

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Circuit Diagran

Transistor Q1 (BF 494) together with coil L1 (5 turns of 23 SWG wires of 5mm air core), trimmer capacitor VC1 (2-22pF), resistors R1 (470K), R2 (470) and a capacitor C1 (102), C2 (103), C10 (10pF) makes an oscillator of frequencies of 93.5MHz-113.5 MHz. A 88.00MHz-108MHz input signal form an antenna( 75cm) and to a base of a transistor Q1(BF 494) through a capacitor C1 is mixed with 93.5MHz-113.5MHz oscillator and a 5.5 MHz IF frequency is taken away from a capacitor C3(33pF) and is connected to a pin 1 of 5.5MHz ceramic filter.

Next connect a pin 2 of X1 to a ground and pin 3 to a pin no: 1 of LA1260. Pin 2, pin 3 of IC1 are also connected ground with a capacitors C4, C4 (403). Pin 4 is connected to ground. Pin 5 is connected to +6V with a resistor R3 (6K8), pin 6 is connected +6V, pin 7 is connected to +6V through a D1 and R4.An AF output is taken away from a pin 8 of IC1 through an electrolytic capacitor C7 (10uF/25V). Capacitor C6 (103) is grounded. Pin 11 of IC1 is connected to ground with an electrolytic capacitor C9 (1uF/25V). Pin 13, 14 are ground. Pins 15, 16 are connected together and are connected to C8 (1uF/25V).

Construction and Testing

A vero board of size 5cm*7cm is suitable for your project. You can also build this on a PCB board given on an article. An inductor coil L1 can be made by winding 5 turns of 23 SWG wire on 5mm air core. You’ll need a 16-pin IC socket for your project. Place 16-pin IC socket on a middle of a veroboard. Place all the components on a veroboard as given on a circuit diagram and solder all the components on a vero board or on a PCB board.

PCB Layout

Now we will test your FM radio. Connect a power supply of +6Volts to your FM radio. Connect an AF output from your FM radio to an AF amplifier. Turn on an AF amplifier and set a volume of AF amplifier to mid position. You’ll hear a hissing sound from a speaker of an AF amplifier.

Now is your FM radio is working and ready for using. Connect a 75cm long wire and connect to your FM radio. Take a small plastic screwdriver and gently tune VC1 until you’ll hear a station.

Also tune a 5.5 MHz IFT coil until you’ll hear clear and loud signal. You’ll see a LED1 glowing as soon as a signal is received.

So, your’ FM radio using LA1260 is working and ready for a using.*

                                            Parts- List


Q1: 494

IC1: LA1260


R1: 470K

R2: 470

R3: (6K8)

R4: (470)


C1: 102

C2: (103)

C3: ( 33pF)

C4, C5: (403)

C6: ( 103)

C7: 10uF/25V

C8, C9: ( 1uF/25V)


X1(3-pin 5.5MHz Ceramic Filter), T1 (5.5 MHz IFT coil, 16-pin IC socket, 5cm*7cm vero board, VC1, 6Volts battery, wires.

Author Prototype

Author Prototype


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