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5 Watt FM Amplifier
Posted on Friday, February 19, 2010   •   Category: FM Transmitters

5 Watt FM Amplifier

This design is a 2 stage amplifier that has about 17db of gain, suitable for an input of 50 to 100 MW. Its basically a Veronica 5 watt vco transmitter, without the vco. The transistors are a 2N4427 and a MRF237. Output power is 2.5 to 5 watts, depending on input drive and dc voltage. At 13.7 vdc with 50 MW of drive, the output was 2.5 watts. The maximum dc voltage recommended is about 15-16 volts.




Audio DAC
Posted on Saturday, October 31, 2009   •   Category: Audio DAC

Audio DAC

The described device is used to convert the digital signal format S / PDIF (AES3) to analog signal. It can be used for any device with an output of uncompressed digital audio (CD or DVD players DVD, minidisc, PC sound card, CD-ROM). The device does not signal processor, and therefore not able to play compressed or encoded multichannel signal (AC3, MP3, respectively. Mpeg). Separate transmitter can improve the signal to noise ratio and to reduce interference, which is especially true for PC sound card.




Intelligent NiCd/NiMH Battery Charger
Posted on Saturday, October 31, 2009   •   Category: Battery Chargers

Intelligent NiCd/NiMH Battery Charger

This cheap and easy to build NiCd/NiMH Battery Charger is suitable for automatically charging a wide range of batteries for many applications. Proper chargers are usually expensive and cheap chargers supplied with the original equipment often incorrectly charge the cells and dramatically shorten their life. This 'intelligent' charger was designed for high current and rapid charge applications such as cordless power tools and model racing cars. These battery packs are expensive and sometimes difficult to purchase. This charger uses the cell manufacturer's recommended charge method, to safely and quickly charge batteries.




ALTOIDS Tin Part 15 Version FM Transmitter
Posted on Saturday, October 31, 2009   •   Category: FM Transmitters

ALTOIDS Tin Part 15 Version FM Transmitter

The transmitter uses 2 MPSH10 (equiv BF494 or NTE229) transistors in a double-ended free-running voltage controlled oscillator (VCO) operating at half the output frequency on each side and combined at L2, which is tuned to the 2nd harmonic of the VCO and covers the 88-108 MHz range. A standard 9 volt battery is used for power and fits inside the tin. The mono audio input circuit is totally passive with 70us pre-emphasis provided and the audio quality is great.




Generator of exact pulses
Posted on Saturday, October 31, 2009   •   Category: PIC

Generator of exact pulses

Circuit is very simple. The generator uses a PIC12F629 microcontroller with clock frequency set by an external RC. Output frequency can be set trimmer P1 in the range of about 2 to 170 Hz. Oscillator frequency can be adjusted if you change C1 capacitance. Pulses are generated with a period of 200 Tcy. All pulses are of equal length. Output frequency is 800 times lower than the frequency of the oscillator.




1 Watt FM Amplifier
Posted on Thursday, October 29, 2009   •   Category: FM Transmitters

1 Watt FM Amplifier

This is a 1 watt amplifier. This design is a 2 stage amplifier that has about 16db of gain, suitable for an input of 5 to 20 MW. The transistors are a 2N4401 and a 2N4427. At 13.7 vdc the most I could get out of the unit was 1/2 watt, you could probably raise the dc voltage to 16 volts and get more output but then a much better heatsink would be required. But for the sake of this project, we'll call it a 1/2 watt amplifier.




30W VHF FM Amplifier for 88 - 108 MHz with BLF245 MOSFET
Posted on Tuesday, October 27, 2009   •   Category: FM Transmitters

30W VHF FM Amplifier for 88 - 108 MHz with BLF245 MOSFET

The achievement of this 30-watt amplifier has been designed to take place on a heatsink microprocessor PC equipped with its fans, the advantage of this method of cooling has been selected for the fact that it is not very common and expensive. The size of the printed circuit will adapt quite easily to the type of heatsink as you have available, if possible, because in many cases, those of recovery, the fans have already lived and the price of a model remains very affordable.




100W FM AMPLIFIER
Posted on Tuesday, October 27, 2009   •   Category: FM Transmitters

100W FM AMPLIFIER

This Power amplifier is equipped with a bipolar transistor,the famous MRF317 As lots of FM amplifier application ,the power transistor is in a C class bias. All the impedance networks (Input & Output) have been determined by using the software: Mimp.EXE. A 9 elements low pass filter ensures that we meet at least a 60 dB rejection from the carrier.(RF Simulation with RFSIM99) The FM amplifier has a 10 dB gain with a 60 to 65% efficiency. The Input VSWR is around 1.4 and there's no problem to reach the max power in all the FM band.




BA1404 HI-FI Stereo FM Transmitter
Posted on Tuesday, October 27, 2009   •   Category: FM Transmitters

BA1404 HI-FI Stereo FM Transmitter

Be "On Air" with your own radio station! BA1404 based transmitter is an exciting product that will broadcast high quality stereo signal in 88MHz - 108MHz FM band. It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.




1W Linear FM Amplifier
Posted on Tuesday, October 27, 2009   •   Category: FM Transmitters

1W Linear FM Amplifier

That RF Amplifier is for boosting small fm transmitters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any linear with BGY133 or BLY87 and so on. Its power supply has to give 500mA current at 12 Volts. More voltage can boost the distance but the transistors will be burned much earlier than usual.! In any case do not exceed the 15Volts. The Amp offers 15 dB in the area of 80Mhz to 110 Mhz. L4, L5, and L6 are 5mm diameter air coils, 8 turns, with wire 1mm wire diameter.An easy project, with great results.




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