Hex3653 datasheet

You may built FM or Radio receivers by using radio tuner components and it requires lot of efforts to built accurate radio receiver. Here is the simple and easy to built fm radio receiver module made by RDA microelectronics used to receive FM signals. You can tune and control this module by using microcontrollers I2C line and of course it is Arduino friendly.

This module has powerful low-IF digital audio processor, hence we can connect headphones directly, if you need huge sound then use Audio amplifier circuit. Operating Voltage of this module is 3. RDAM module has few external connecting terminals and it can be easily interfaced with Arduino. RDAM Datasheet.

I have changed to the strongest stations in the area. I have run other sketches and still just the one frequency tunes. Do these FM radio chips come programmed to one frequency only? Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Currently you have JavaScript disabled. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page.

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This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More.A radio or FM receiver is an electronic device that receives radio waves and converts the information carried by them to a usable form. An antenna is used to catch the desired frequency waves. The receiver uses electronic filters to separate the desired radio frequency signal from all the other signals picked up by the antenna, an electronic amplifier to increase the power of the signal for further processing, and finally recovers the desired information through demodulation.

Of the radio waves, FM is the most popular one. Frequency modulation is widely used for FM radio broadcasting.

It is also used in telemetry, radar, seismic prospecting, and monitoring newborns for seizures via EEGtwo-way radio systems, music synthesis, magnetic tape-recording systems and some video-transmission systems. An advantage of frequency modulation is that it has a larger signal-to-noise ratio and therefore rejects radio frequency interference better than an equal power amplitude modulation AM signal.

This bandwidth range is marked as FM on the band scales of radio receivers, and the devices that are able to receive such signals are called FM receivers. The FM radio transmitter has a kHz wide channel.

The maximum audio frequency transmitted in FM is 15 kHz as compared to 4. This allows a much larger range of frequencies to be transferred in FM and thus the quality of FM transmission is significantly higher than of AM transmission.

The resonance frequency of this oscillator is set by trimmer VC to the frequency of the transmitting station that we wish to listen.

That is, it has to be tuned between 88 and MHz.

Hex3653 FM radio module kit

The information signal used in the transmitter to perform the modulation is extracted on resistor R1 and fed to the audio amplifier over a nF coupling capacitor C1. You should be able to change the capacitance of the variable capacitor from a couple of picofarads to about 20 pF. So, a 22pF trimmer is a good choice to be used as VC in the circuit. It is readily available in the market. If you are using some other capacitor that has a larger capacitance and are unable to receive the full FM bandwidth MHztry changing the value of VC.

Its capacitance is to be determined experimentally. The self-supporting coil L has four turns of 22 SWG enamelled copper wire, with air core having a 4mm internal diameter.

It can be constructed on any cylindrical object, such as a pencil or pen, having a diameter of 4 mm. You can use the telescopic antenna of any unused device. However, A good reception can also be obtained with a piece of isolated copper wire about 60 cm long. The optimum length of copper wire can be found experimentally. The performance of this tiny receiver depends on several factors such as quality and turns of coil L, aerial type, and distance from FM transmitter.

hex3653 datasheet

IC LM is an audio power amplifier designed for use in low-voltage consumer applications. It provides 1 to 2 watts, which is enough to drive any small-size speaker. The 22k volume control VR is a logarithmic potentiometer that is connected to pin 3 and the amplified output is obtained at pin 5 of IC LM The receiver can be operated off a 6V-9V battery.

Feel excited? Check out the FM transmitter. For more exciting circuits: click here. If u r in a remote area use dipole with booster. We have checked the list and compared it to the diagram. Please let us know the what are the components that are not same. Please note that if you are near a commercial FM broadcast station, you can receive the FM channel signals in this circuit. This is because it is a simple circuit and does not have the power and sensitivity to receive the weak signal.

However, you can construct any FM transmitter circuit which works in the FM band MHz and receive the transmitted signal using this simple FM receiver circuit.The design involves proper use of inductors and capacitors with correct values. Since the IC is dedicated to build radio circuits, this circuit is very much reliable to an extent. This circuit is designed as per the data sheet and the result is excellent. Ideal for all category of electronic enthusiasts.

The TDA is a monolithic integrated circuit for mono FM portable radios, where a minimum on peripheral components is crucial. The intermediate frequency selectivity is achieved by active RC filters. The only function which needs alignment is the resonant circuit for the oscillator, thus selecting the reception frequency.

Spurious reception is avoided by means of a mute circuit, which also eliminates too noisy input signals. Special steps are taken to meet the radiation requirements. We have more Radio Circuits with us, which you may like to read:. AM Receiver Circuit. Low Cost AM Radio. Simple Radio Circuit. Antenna Tuner Circuit. Hello iam from Acharya ITI, Bangalore we required some of the receiver for our student to their project work they are. Sir want do a fm reciver circuit. BBa toimii kohtalaisesti. Plz sir help me…i want to make fm radio transmitter for the cxa bs receiver…wht is circuit diagram….

I appreciate for many electronics circuit, all are very useful especially for me, and for others. I have plan to launch a radio station of my own. Learned from this rich article. Thanks author for sharing us. Hi Greeshma you have to use the PCB shown in the application datasheet of the manufacturer. If you have all components on hand with good solering iron and lead you can finish the project in 4 to 5 hrs if you are good at soldering If you are a beginner use only discrete component projects using simple transistors before starting with multi-pin ICs.

Use the recommended PCB shown in Sony application datasheet. Hi, Seetharaman plz help me, plz send me circuit diagram of fm receiver with ic which available in village side also.

I AM doing experiment form my childhood i have interest in automatic machinestransmitter and other circuits lm ,lm timer,hcf ,lm ic is very good for hobby.

There is also the common known TCA for sale, around 10 Euros.The RDAM series is the newest generation single-chip. The tuner uses the CMOS process, support multi-interface. All these make it. The RDAM series support frequency range is from. Reference clock. All rights are reserved. The information contained herein is the exclusive property of RDA and shall not be distributed, reproduced, or disclosed in whole or in. RDA Microelectronics, Inc. Power up.

And also support soft reset by trigger. The RDAM only. Specification 2. It includes two pins: SCLK and. The command byte includes.

Simple FM Receiver

When in write transfer, data bytes is written out. There is no visible. If register.

hex3653 datasheet

For write. For read transfer, after. MCU gives out. STOP condition. Page 5 of Seek SNR threshold value. Volume scale is logarithmic.

Whenoutput mute and. Open reserved register mode. Threshold for noise soft blend setting, unit 2dB Seek threshold for old seek mode, Valid when If 1, Softblend enable. If 1, then freq setting changed. RDS ready. Seek Fail. The seek fail flag is set when the seek. RDS Synchronization. Available only in RDS Verbose mode. When RDS enable:. Page 11 of The tuner uses the CMOS process, support multi-interface and require the least external component.While I was dismissive of its educational value, I thought it might be a nice way to occupy an hour of an afternoon just to see what its performance was like.

As a result, I ordered the Hexbased kit, a stereo auto-scanning FM receiver based around a single chip with push button volume, scan and power controls operating off two AA batteries. It arrived today, so I decided to build it right away. When I received the package today, I was a little surprised. No instructions. Inside, you have a tin-plated PCB with solder mask and silkscreening on one side.

The rest of the components, as sorted out. All the diodes are one type, all the electrolytic capacitors are one type. One of the ceramic capacitors was 33pF, the other two were 0. Three resistors, all k ohm, an LED, an inductor in greena Aside from that are a row of header pins and a jumper shunt. I started on the buttons first because I was concerned about the orientation which turned out not to be a major issue as the legs were rectangular in arrangementwhich resulted in limited access to the SMD chip and hence an ugly solder job on one side.

Still not too bad. I mounted the components as I saw best and used some of the seller images for guidance, bending the crystal over in the opposite direction to avoid shorting the pins on the chip.

C3 and C5 were both 0. C1 and C2 were both electrolytic uF. R1 was k, as was R3 and R4. Namely that R2 was supposed to be a 2. This is another case of Chinese kit sabotage — missing or incorrect components. This would probably be quite frustrating for a beginner.I was aware of the Tecsun 2P3 which looks to be a very nice kit, but a bit on the pricey side for an AM only radio. So, I rummaged on eBay looking for radio kits, and surprisingly, there were quite a few!

The big downside? Everything is in Chinese. Just another way engineering solves the day! Luckily for everyone, the board also has very good silkscreening to judge by the listing. As a result, I accepted the challenge and put in an order for two kits. Ordering two ensures that you have some spares in case things do go wrong …. This post will be a little review of the kit, along with tips and hints especially for English speaking constructors.

Rather unimpressively, each kit comes in a bubble wrap package. Trouble was already spotted when a loose screw was seen rattling inside the bubble wrap — the components have broken loose and the only thing preventing them from going everywhere was a thin and somewhat torn bubble wrap. The case for this was soon found — the components are actually wrapped inside a cellophane bag, but that sort of material has a tendency to tear when punctured by the sharp component legs — quickly the smaller components work their way out.

Rather nicely, the PCB is a single sided paper-type board with silkscreening on both sides which is very descriptive, and solder mask on the rear. It seems to have a lacquer finish to stop the pads from oxidising, but is not otherwise tinned nor plated.

As mentioned, the instructions were all in Chinese. Unfortunately, the instructions are only a single double-sided sheet, so the educational value of the kit is somewhat limited. The schematic as listed is shown above. The unit has an IF of about 70kHz, and features a frequency locked loop with internal muting of weak signals. Filtering is achieved with the external components — mainly R-C filters. The AM reception is being achieved with the CD That leaves the TDAwhich is a stereo audio amplifier chip to drive speakers and headphones.

It is used to drive the headphone jack which disconnects the internal speaker once a headphone plug is plugged in. Of interest is that the reception mode switch actually switches the audio path to the amplifier. As an experienced kit builder, I wasted no time in getting started. In the case of this kit, this specifically includes:. We start by first emptying all components into a plastic bowl so they can be sorted through.

hex3653 datasheet

For this kit, I preferred to do things the opposite way. Start by identifying pin 1 and straightening bent pins.A radio or FM receiver is an electronic device that receives radio waves and converts the information carried by them to a usable form.

An antenna is used to catch the desired frequency waves. The receiver uses electronic filters to separate the desired radio frequency signal from all the other signals picked up by the antenna, an electronic amplifier to increase the power of the signal for further processing, and finally recovers the desired information through demodulation.

hex3653 datasheet

Of the radio waves, FM is the most popular one. Frequency modulation is widely used for FM radio broadcasting. It is also used in telemetry, radar, seismic prospecting, and monitoring newborns for seizures via EEGtwo-way radio systems, music synthesis, magnetic tape-recording systems and some video-transmission systems. An advantage of frequency modulation is that it has a larger signal-to-noise ratio and therefore rejects radio frequency interference better than an equal power amplitude modulation AM signal.

This bandwidth range is marked as FM on the band scales of radio receivers, and the devices that are able to receive such signals are called FM receivers. The FM radio transmitter has a kHz wide channel. The maximum audio frequency transmitted in FM is 15 kHz as compared to 4.

New and Popular Datasheets

This allows a much larger range of frequencies to be transferred in FM and thus the quality of FM transmission is significantly higher than of AM transmission.

The resonance frequency of this oscillator is set by trimmer VC to the frequency of the transmitting station that we wish to listen. That is, it has to be tuned between 88 and MHz. The information signal used in the transmitter to perform the modulation is extracted on resistor R1 and fed to the audio amplifier over a nF coupling capacitor C1.

You should be able to change the capacitance of the variable capacitor from a couple of picofarads to about 20 pF. So, a 22pF trimmer is a good choice to be used as VC in the circuit. It is readily available in the market. If you are using some other capacitor that has a larger capacitance and are unable to receive the full FM bandwidth MHztry changing the value of VC.

Its capacitance is to be determined experimentally. The self-supporting coil L has four turns of 22 SWG enamelled copper wire, with air core having a 4mm internal diameter. It can be constructed on any cylindrical object, such as a pencil or pen, having a diameter of 4 mm.

You can use the telescopic antenna of any unused device. However, A good reception can also be obtained with a piece of isolated copper wire about 60 cm long.

The optimum length of copper wire can be found experimentally. The performance of this tiny receiver depends on several factors such as quality and turns of coil L, aerial type, and distance from FM transmitter. IC LM is an audio power amplifier designed for use in low-voltage consumer applications. It provides 1 to 2 watts, which is enough to drive any small-size speaker. The 22k volume control VR is a logarithmic potentiometer that is connected to pin 3 and the amplified output is obtained at pin 5 of IC LM The receiver can be operated off a 6V-9V battery.

Feel excited?


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