Zone. com - Electronic Projects, Electronic Schematics, DIY Electronics. Posted on Monday, August 7, 2.

Retrouvez toutes les discothèque Marseille et se retrouver dans les plus grandes soirées en discothèque à Marseille. Bitte - news:de.newusers.infos lesen, vor allem die dämliche, typisch deutsche Realnamensdiskussion nicht ständig mit falschen Behauptungen neu aufrollen. Interfacing with Hardware. These topics cover the hardware and software setup required to connect an Arduino device with a variety of electronic parts, chips and devices.

With 1. 2 volt DC it will deliver 1 watt RF power. With Yagi antenna, looking like early days of TV antenna with aluminum pipes at both at transmitter and receiver end looking each other at line of sight distance, the range can be up to 5 km / 3 miles. When the battery is first connected, a brief surge of current flows from the collector to the emitter of Q1, causing an oscillating (i. Ll and CV1. An oscillating voltage therefore appears at the junction of Ll and CV1.

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The frequency of the oscillation depends on the values of Ll and CV1, so that varying the value of CV1 tunes the oscillations to the exact frequency required. Connect to your ipod/computer, etc.

When this was first made, I only had a 2. N2. 21. 9A on hand, which resulted in a lower RF output. I have since swapped out the transistor for a 2. N3. 86. 6 for full 4. W output at around 1. VDC supply. In order to achieve a high output level, you will need a well tuned antenna, and a large heatsink to dissipate the heat from T2 transistor.

Unfortunately, for me, the design was only SMD so, I decided to replicate his schematic in Eagle PCB using a through hole component design. I will not be going into much detail regarding ESR or Equivalent Series Resistance Meters as, there is already plenty of other sources of information on the subject. Yet, every tinkering knows capacitors are guilty of a lot of sins in electronics. Capacitors love to throw red herrings! They can appear physically fine (no bulge), show good capacitance and hide in circuit, standing to attention like the Queens Guards hiding shorts and high resistance under their big hats.

This is where the ESR tester can be a saviour, with the ability to test for . They can also be used to test . Frequency adjustment is accomplished with MV2. R7 1. 0K potentiometer.

SC2. 53. 8 is a class C 3. W amplifier. The amplifier chip is an integrated circuit containing multiple transistor stages and all other parts conveniently within a single small package. Boosting your FM transmitter has never been easier and the output signal can also directly drive 2n.

W or 5. W of RF output power. It includes multi- level low pass filter and has a high conversion efficiency with strong Yi- wave suppression. With good antena expected transmission coverage is at least 1. Km. It is considered as a serious source of energy for many years because of the vast amounts of energy that is made freely available, if harnessed by modern technology. Many people are familiar with so- called photovoltaic cells, or solar panels, found on things like spacecraft, rooftops, and handheld calculators.

The cells are made of semiconductor materials like those found in computer chips. When sunlight hits the cells, it knocks electrons loose from their atoms. As the electrons flow through the cell, they generate electricity. The energy gained by the solar panel is stored in a Li. Po battery. Then the battery is used to supply a stable 5.

V which is used by USB gadgets. The power bank can also be charged by an external 5. V source. The best thing for this power bank during day that you don. It charges itself by using the sunlight and you don. Generator based on good old ICL8. This circuit has been designed a little differently than ICL.

I tested a bunch of different configurations with different peripherals and chosen the best . I got rid of some of the elements, I added my own solutions. The two ICL chips that i have can oscillate around up to 4. Hz, and practically we can get good waveforms up to that frequency.

It includes an extremely consistent oscillator for the reason that you employ LM7. V stabilized power source for T1 transistor and for frequency realignment that may be reached by means of the 1. K linear potentiometer. The output strength of this long range rf transmitter is approximately 1.

W. Transistor T1 is employed as an oscillator stage to present a small power steady frequency. To fine- tune the freq.

Essentially the potentiometer is needed just as a flexible power source for the a pair of MV2. Both of these diodes function as a changeable capacitor whilst you regulate the pot. By tweaking the diode capacitance the L1 + diodes circuit renders a resonance circuit for T1. Feel free to employ transistors similar to BF1.

BF2. 14 however be careful not to use BCs. At this point you don. LM3. 38's Data Sheet has several very helpful application notes and circuits. I chose one that illustrated variable output and included protection diodes. Diodes are included to protect the regulator from damage in case the input is accidentally shorted to ground. This is a distinct possibility if using jumpers to attach it to the power supply. Also the output of station supply may be shorted if some other device fails.

Without the diodes, if this happens, the capacitors will dump their charge back through the regulator. Since the current spike may be many amps, the regulator may fail. The diodes steer the current around the regulator and into ground, thereby protecting it from damage. With adequate input the LM3. This small supply is user friendly and fits nicely on my cluttered bench. The idea of being able to hide a transmitter in a pen is very appealing. In an effort to reduce the size of this design, we have used surface- mount components.

Firstly, the thought of using the coil in the tank circuit for transmitting RF was a little far fetched, but we used it as an example for those who were interested in experimenting with our circuits. Now we have gone back to a conventional antenna, the whip. The whip or straight- line antenna can be coiled, wound longitudinally or folded. The way it is wound makes a big difference to its effectiveness, but when you are limited in space, you have to accept these limitations. The size of this design has been reduced considerably by using surface- mount components.

It broadcasts audio on 7. MHz - 1. 10. MHz FM frequency via included on board microphone or from MP3 player, Phone, i. Pod, Computer, Laptop, CD Player, TV, Satellite Receiver via on board 3. It transmit sound with excellent clarity throughout your home, office, yard, camp ground, etc. Transmitter is supplied by 3- 1.

V DC voltage and uses one 2. SC9. 01. 4 and two 2. SC9. 01. 8 low noise RF transistors. I managed to squeeze all the parts on small 1. PCB. When using small wire antenna and 3.

V power the range is 5. The coil has 1. 0 turns on a 3 mm diameter and is wound with 0. The microphone is an electret type. Transmitting frequency is changed by stretching or compressing the coil. Furthermore, we can change the frequency by changing C2 capacitor (1. F capacitor with a frequency of about 8.

MHz, with 8. 2p. F 9. Mhz and 6. 8p. F 1.

Mhz). Further tuning to the correct frequency is done through the coil. Transmitter can be powered by 3. V button battery.

The circuit is designed around the BA1. FM stereo transmitter from ROHM. The IC requires only a small number of external parts so it is well suited for hobbyist projects. The chip features excellent frequency stability, low power consumption & good channel separation. The transmitting RF frequency can be set by adjusting the coil (Lx). This 2 turn coils is paired with a 3.

F capacitor (Cx) to give a frequency range from 8. MHz - 1. 06 MHz. It utilities a variable high gain audio pre- amplifier which can detect voices 4. Using a NBFM scanner, ranges over 5. KM have been achieved using a 4.

Coils are 2. 2SWG 7mm air core. L1 and L2 should be 6 turns for 7. MHz to 8. 5MHz, 4 turns for 8. MHz to 1. 00. MHz and 3 turns for 1. MHz. For frequencies over 1.

MHz the Crystal will be higher than 2. MHz hence the base emitter capacitor should be 4. Trivial Pursuit Family Edition Cracked.

F. L3 is a 4. 7u. H choke. It is ideal to tune up this circuit using a wave detector meter placed a few inches away from the transmitter. This small and simple 8.

MHz FM transmitter is the toy that geeks have always wanted. This tutorial includes the PCB layout and the schematics.