Small FM Radio Circuit.pdf

13/08/2016

Sm al l FM Radi o Ci r cui t

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Small FM FM Radio Circuit D MOHANKUMAR (HTTP://WWW.ELECTROSCHEMATICS.COM/AUTHOR/MOHANKUMAR/)

(https://www.facebook.co (https://www.facebook.com/sharer/sharer.php m/sharer/sharer.php?? u=http://www.electroschemat u=http://www.electroschematics.com/5150/ti ics.com/5150/tiny-fm-radio/) ny-fm-radio/) LM386 (/tag/lm386-circuits) (/tag/lm386-circuits) radio receivers (/tag/radio-receiver-circuits) rcuits) (https://twitter.com/share) (/qa/)(/tag/radio-receiver-ci This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if Search 4 million million + Products Products you wish. Accept Read More (/policy/) 

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Small FM Radio Circuit

Perhaps this is one of the simplest and smallest FM radio receiver that can receive the FM stations available locally. Its simple design makes it ideal for a pocket (http://www.mouser.com/Passivesized FM receiver. The output of the receiver(http://www.mouser.com/Passivedrives a head phone. ● Capacitors ● Resistors (/) Components/Capacitors/_/N-5g7r/)

Components/Resistors/_/N-5g9n/)

The circuit works oô a small 4.5 volt battery or two 3.6 volt Lithium button cells. ● Input Devices ● Transformers The fm receiver section has two RF transistors T1 and T2 to detect the Frequency (http://www.mouser.com/Electromechanical/In dustrial- (http://www.mouser.com/Power/Transformers/_/NModulated signals. Coil L1 and the trimmer capacito form the tuned tank circuit Automation/Input-Devices/_/N-5g20 /) 8u9mo/) to tune the receiver to the best FM station with strong signals. The signals are ● Temperature Sensors capacitor coupled through C2. (http://www.mouser.com/Sensors/Temperature-

●

Sensors/_/N-7gz50/) ●

●

●

Encoders (http://www.mouser.com/PassiveComponents/Encoders/_/ N-6g7nx/)

Tiny FM Radio Receiver Circuit Schematic

Motors & Drives

●

Liquid Sensors

(http://www.mouser.com/Electromechanical/Motors-

(http://www.mouser.com/Sensors/Liquid-Level-

Drives/_/N-u86z/)

Sensors/_/N-zqig/)

Current Sensors

●

Timers

(http://www.mouser.com/Sensors/ Current-

(http://www.mouser.com/Electromechanical/Industrial-

Sensors/_/N-7gqeu/)

Automation/Timers/_/N-budh3/)

Potentiometers & Trimmers (http://www.mouser.com/PassiveComponents/Potentiometers-Trimmers-

●

Rheostats/_/N-9q0yi/) ●

●

Batteries (http://www.mouser.com /Power/Batteries/_/N-5gbk/)

Proximity Sensors

●

7 Segment Displays

(http://www.mouser.com/Sensors/Proximity-

(http://www.mouser.com/Embedded-

Sensors/_/N-7h7mq/)

Solutions/Display-Modules/_/N-6m71g/)

Relays (http://www.mouser.com/Electromechanical/ Relays/_/N-● Connectors 5g31/)

●

(http://www.mouser.com/Connectors/_/N-5g3y/)

(http://www.electroschematics.com/wp● Switches Pressure Sensors (http://www.mouser.com/Sensors/Pressure(http://www.mouser.com/Electromechanical/Switches/_/N content/uploads/2010/02/small-fm-radio.jpg) Sensors/_/N-6g7qc/) small fm radio circuit schematic

5g2h/) ●

●

Interface Modules

10K preset VR controls the volume to the input of the ampliúer. IC1 is the micro Varistors (http://www.mouser.com/Passive(http://www.mouser.com/Embeddedpower audio ampliúer that works between 4.5 to 12 volts DC. The ampliúed Components/Varistors/_/N-6g7mv/) Solutions/Interface-Modules/_/N-5g1o/)

●

sound can be -heard through the low Integrated Circuits ICs

impedance head phone or small Mylar ● DC/DC Converters

speakers. (http://www.mouser.com/Semiconductors/Integrated-

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Circuits-ICs/_/N-6j73k/)

Converters/_/N-brvxe/)

FM radio coil

●

AC Powers Cords

●

LED Lightings

Coil is the important part of the FM tuner. It is made up of 18 SWG enameled (http://www.mouser.com/Power/AC-Power(http://www.mouser.com/Optoelectronics/LEDThis website uses cookies to improve your experience. We'll assume you're ok with this,Remove but you can opt-out if copper wire. Wind 4 turns on a ball pen to get 0.5 cm inner diameter. Cords/_/N-6g7lo/) Lighting/_/N-74g9t/) Search 4 million + Products

you wish.

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the enamel from the tip of the wire and solder tightly in the PCB. Trimmer and (http://www.mouser.com/Semiconductors/RFcoil should be soldered very closely. Adjust the spacing of the coil winding if Measurement/Multimeters-Voltmeters/_/N-5gfo/) Semiconductors/_/N-96p9c/) necessary to get the station clearly. Assemble all the receiver components as ● Capacitors ● Resistors (http://www.mouser.com/Passive(http://www.mouser.com/Passive● Processors & Controllers Components/Capacitors/_/N-5g7r/) Components/Resistors/_/N-5g9n/) close as possible to get better result. (http://www.mouser.com/Semiconductors/Integrated(http://www.mouser.com/Test-

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Measurement/Counters-Tachometers/_/N-budrw/) (http://www.mouser.com/Sensors/Temperature-

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Sensors/_/N-7gz50/) ●

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Oscilloscopes (http://www.mouser.com/TestTransformers

Cable/_/N-5ggl/) Encoders (http://www.mouser.com/PassiveComponents/Encoders/_/ N-6g7nx/)

Motors & Drives

●

Liquid Sensors

(http://www.mouser.com/Electromechanical/Motors-

(http://www.mouser.com/Sensors/Liquid-Level-

Drives/_/N-u86z/)

Sensors/_/N-zqig/)

Current Sensors

●

Timers

(http://www.mouser.com/Sensors/ Current-

(http://www.mouser.com/Electromechanical/Industrial-

Sensors/_/N-7gqeu/)

Automation/Timers/_/N-budh3/)

(http://www.electroschematics.com/wp-content/uploads/2010/02/LM386.png)

●

Potentiometers & Trimmers

LM386 datasheet (http://www.electroschematics.com/556/lm386/)

(http://www.mouser.com/Passive-

Components/Potentiometers-Trimmers-

●

Rheostats/_/N-9q0yi/) ●

Batteries (http://www.mouser.com /Power/Batteries/_/N-5gbk/)

Previous

Proximity Sensors

●

7 Segment Displays

(http://www.mouser.com/Sensors/Proximity(http://www.mouser.com/EmbeddedUltrasonic Beam

Barrier Circuit Solutions/Display-Modules/_/N-6m71g/) (http://www.electroschematics.com/5144/ultrasonic-beam● Relays barrier/) (http://www.mouser.com/Electromechanical/ Relays/_/N-● Connectors Sensors/_/N-7h7mq/)

●

5g31/)

Next

Pressure Sensors

Shadow Alarm●Circuit Switches

(http://www.mouser.com/Connectors/_/N-5g3y/)

(http://www.mouser.com/Sensors/Pressure(http://www.mouser.com /Electromechanical/Switches/_/N (http://www.electroschematics.com/5163/shadow-alarm/) Sensors/_/N-6g7qc/)

5g2h/) ●

VaristorsTutorials (http://www.mouser.com/PassiveRelated

(http://www.mouser.com/Embedded-

●

Components/Varistors/_/N-6g7mv/) ●

Interface Modules Solutions/Interface-Modules/_/N-5g1o/)

Mini AM Radio- ICs Receiver Circuit (http://www.electroschematics.com/3043/mini-am-radio● DC/DC Converters Integrated Circuits circuit/) (http://www.mouser.com/Semiconductors/Integrated-

(http://www.mouser.com/Power/DC-DC-

Two Transistor AM Radio Receiver (http://www.electroschematics.com/601/2-transistorCircuits-ICs/_/N-6j73k/) Converters/_/N-brvxe/) ●

radio-receiver/)

AC Powers Cords

●

LED Lightings

Simple FM Receiver Circuit (http://www.electroschematics.com/4663/small-fm-receiver/)

(http://www.mouser.com/Power/AC-Power-

(http://www.mouser.com/Optoelectronics/LED-

PC FM Radio Circuit (http://www.electroschematics.com/664/pc-fm-radio/) Cords/_/N-6g7lo/) Lighting/_/N-74g9t/) http://www.electroschematics.com/5150/tiny-fm-radio/

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(http://www.mouser.com/Test-

(http://www.mouser.com/Semiconductors/RF-

Measurement/Multimeters-Voltmeters/_/N-5gfo/) 97 Comments ●

Semiconductors/_/N-96p9c/)

Processors & Controllers (http://www.mouser.com/Semiconductors/IntegratedCircuits-ICs/Embedded-Processors-Controllers/_/N-

●

a86bc/) ●

Oscilloscopes (http://www.mouser.com/TestMeasurement/Oscilloscopes/_/N-5gff/)

Join the conversation!

Counters & Techometers

(http://www.mouser.com/Test-

●

Wire & Cable (http://www.mouser.com/Wire-

You must be logged in (http://www.electroschematics.com/wp-login.php? Measurement/Counters-Tachometers/_/N-budrw/) Cable/_/N-5ggl/) redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftinyfm-radio%2F) to post a comment.

prakhar-kumar91gmail-com what is the function of the two transistors? Posted on April 22nd 2016 | 12:23 pm (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1899830) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)

jeetu Hello sir please tell me. how can i check my tune circuit through multimeter. right now i have designed my circuit but it is nit working. my headphone gives hizzzz sound. please help me. best regard. Posted on January 18th 2016 | 1:34 pm (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1893433) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)


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aditya Inductor coil is 18 SWG or 18 AWG ? Posted on January 18th 2016 | 3:29 am (http://www.electroschematics.com/5150/tiny-fm-radio/#comment1893308) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)

AKINYELE I HAVE BEEN TRYING TO BUY 18SWG AIRCORE COPPER INDUCTOR BUT I COULD NOT SEE TO BUY. I WANT TO MAKE ONE BUT I COULDNT GET COPPER WIRE OF THE EXACT DIAMETER(18 SWG = 1.219MM). THE DIAMETER I GOT ARE 1MM, 1.5MM, 2MM. CAN I USE 1MM OR 1.5MM? THANKS Posted on January 15th 2016 | 6:50 pm (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1892559) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)

tiago what’s value for inductor? Posted on December 16th 2015 | 9:30 pm (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1880358) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)

Sourav Karmakar what is the L1 (inductor) real value. http://www.electroschematics.com/5150/tiny-fm-radio/

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Posted on September 17th 2015 | 8:28 pm (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1801923) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)

vivek choudhary Sorry sir this circuit would not work Posted on August 08th 2015 | 5:29 am (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1757619) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)

Rum bum bum Change transistors other. It must act. Posted on August 08th 2015 | 5:40 pm (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1757975) 

mohammed pls i will appreciate it if you can help me out with a schematic diagram of a úve way wireless intercom with explanation on how the stages function. thank you. Posted on June 02nd 2015 | 1:29 pm (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1700146) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)

Peter Pan For those using breadboard. They can cause all sorts of problem, e.g. stray capacitance, not working well with high frequency > 10mhz. http://www.electroschematics.com/5150/tiny-fm-radio/

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Try on veroboard or home made pcb. Or buy a brand new high quality breadboard from trusty vendor. I bought many dirt cheap breadboards from ebay which make you troubleshoot circuits where the problem may actually lie in the breadboard. Posted on April 21st 2015 | 3:42 pm (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1653989) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)

Waqas. How to únd the pins of gang capacitor. I found gang capacitor which have no writing on it. I got the disturbances in the output but there is no voice in head phone. How can improve the quality ? I am using capacitor in IC pins (1,8). Posted on April 04th 2015 | 7:53 am (http://www.electroschematics.com/5150/tiny-fmradio/#comment-1631368) Log in to Reply (http://www.electroschematics.com/wp-login.php?  redirect_to=http%3A%2F%2Fwww.electroschematics.com%2F5150%2Ftiny-fm-radio%2F)

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Small FM Radio Circuit.pdf

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