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FM Transmitter Circuits
FM Transmitter Circuits
Stereo FM Transmitter with BA1404
A high quality stereo FM transmitter circuit is shown here. The circuit is based on the IC BA1404 from ROHM Semiconductors. BA1404 is a monolithic FM stereo modulator that has built in stereo modulator, FM modulator and RF amplifier. The FM modulator can be operated from 76 to 108MHz and power supply for the circuit can be anything between 1.25...
Stereo FM Transmitter Using BA1404
The circuit is based on the IC BA1404 from ROHM Semiconductors. BA1404 is a monolithic FM stereo modulator that has built in stereo modulator, FM modulator, RF amplifier circuitry. BA1404 FM transmitter can be operated from 76 to 108MHz and power supply for the circuit can be anything between 1.25 to 3 volts. .
How do i calculate the frequency of an fm transmitter circuit
simple and powerful FM transmitter
simple and powerful FM transmitter is a interesting project using one transistor range of 100 M circuit diagram with description of FM transmitter various interesting project.
Long range FM transmitter
This is very stable, harmonic free, long range fm transmitter circuit which can be used for fm frequencies between 88 and 108 MHz. This can cover 5km range (long distance). It has a very stable oscillator because you use LM7809 stabilizer which is a 9V stabilized power supply for T1 transistor and for frequency adjustment that can be achieved by u
2 Watt FM Transmitter
The circuit is basically a radio frequency (RF) oscillator that operates around 100 MHz. Audio picked up and amplified by the electret microphone is fed into the audio amplifier stage built around the first transistor. Output from the collector is fed into the base of the second transistor where it modulates the resonant frequency of the tank circ
FM TransmitterCircuit & Project Kits
The transmitter is built on a Printed Circuit Board. This board uses track inductor for L1, L2 and part of L3. The section built around Q1 is the oscillator section. Oscillation frequency is determined by L1, C4 & C5 which forms the tank. Actually C5 is the feedback capacitor. This is required to sustain oscillation. This also influence the operat
ANTENNA DESIGN FOR FM TRANSMITTER
Two aluminum rods, each of length "L" in meters are joined together through an insulator as shown in fig. From center, 75 ohm cable is feeded just like ordinary TV antenna.
USB FM Transmitter Circuit
Here`s a small FM transmitter ciruit for your desktop or laptop to enjoy the movie and music from a distance. This FM transmitter, which is powered by USB, recovers output on your computer or your MP3 player to the relay on the tape FM (frequency 108 MHz). For Assemblying this FM transmitter kit, an electronics hobbyist will have built in about 30
Digitally controlled FM transmitter with 2 line LCD display
Each step will result in a self functional unit. In the end of this journey, you will be able to link the steps together into a very powerful FM transmitter. This part will explain the main controlling unit for the FM transmitter. This part is very important since the transmitter frequency is digitally controlled and thereby very stable. The PIC16
Two Transistors Wireless Microphone FM Transmitter Circuit Schematic Diagram
Circuit diagram 500mW FM PLL transmitter 88-108MHz using LMX3206 and PIC16F870
This oscillator is called the Colpitts oscillator and voltage controlled to achieve the FM (frequency modulation) and PLL control. T1 must be HF transistors to work well, but in this case I use a cheap and common BC817 transistor. LC tank oscillator needs to oscillate properly. (I must warn you that the signal is not symmetrical in form. Pulsa pos
Understanding FM transmitter circuit
Wireless FM Transmitter. The site has some explanation on how the circuit works, however I`m not sure about a few things, including the electret mic & how the frequency modulation takes place. The electret microphone has a current of 200uA which changes by +- 3 uA depending on sound waves. This sets the voltage across R1 to 2V and the voltage acro
Versatile FM Transmitter
The gate N1 acts as a buffer for strengthening the signals from the condenser microphone. The inverter N2 with its associated components forms a radio frequency oscillator in the FM region. The varicap diode BB109 is used for frequency modulating the audio signal to the carrier wave generated by the oscillator. Inverters N4 t0 N6 are used to...
Spy FM Transmitter circuit
FM Transmitter Bug
Mini FM Transmitter
FM Transmitter Circuit Type Versatile
This is a design circuit diagram of a versatile FM transmitter. This circuit doesn`t have a coil. The circuit is simple and easy to assemble. This circuit is work based on gate logic concept. This is the figure of the circuit. The gate N1 acts as a buffer for strengthening the signals from the condenser microphone. The inverter N2 with its associa
USB FM Transmitter for MP3 Player
This MP3 Player FM transmitter can be used to listen to your own music throughout your home. The transmitter circuit use no coils that have to be wound. When this FM transmitter used in the car, there is no need for a separate input to the car stereo to play back the music files from your MP3 player. This FM transmitter use a chip made by Maxim In
FM narrow band transmitter 27mhz
FM Transmitter Circuit
FM Transmitter Circuit An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier. Circuit Diagram Parts List R1 4K7 R4 150K R7 3K9 (2K7)R2 4K7 R5 220R R8 120R (82R)R3 4K7 R6 4K7A..
FM transmitter overvoltage protection circuit
FM302E-I-type FM transmitter exciter is the NEC Corporation, Japan`s HPB with a 1210 motherboard. Direct frequency modulation of the carrier, using phase-locked frequency stabilization and frequency synthesis. The front power amplifier (BLF-177 FET) ..
Single Chip Stereo FM Transmitter Circuit
an FM modulator that modulate a carrier frequency with the composite signal, and an RF amplifier that provide enough power to be transmitted through antenna. Here is the schematic diagram of theFM transmitter circuit: The core of this stereo FM tra..
fm telephone line bug transmitter
mini fm transmitter circuit
Here is the mini FM transmitter circuit using 2 transistor. Audio sensitivity is very good when used with an ECM type microphone insert. This smallFM transmitteruses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the t
medium power fm transmitter circuit
This is a design circuit diagram of a moderate power FM transmitter circuit. This circuit is built operation by two transistors. This is a figure of complete circuit. Operation of this circuit is explain as the voice signals picked by the microphone will be amplified by the transistor Q1. The second transistor is wired as an oscillator operating in
fm tracking transmitter circuit
This is a design for the tracking transmitter of audio tone in FM band frequency. The circuit can be used a signal transmitter or remote control transmitter. The circuit is use only the available components. The range of the transmitter is 100 m in the distance using 9V power supply and with a matching antenna. The circuit is built by 555 timer IC
stereo fm transmitter with ic ba1404
bh1417 usb fm transmitter
2 watt fm transmitter
telephone fm transmitter
2 transistor fm voice transmitter
This is a circuit for voice transmitter using a pair of BC548 transistors in this circuit. Although not strictly RF transistors, they still give good results. I have used an ECM Mic insert from Maplin Electronics, order code FS43W. It is a two terminal ECM, but ordinary dynamic mic inserts can also be used, simply omit the front 10k resistor. This
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Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
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