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


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


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


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


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.


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