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Folded Dipole Antenna
Posted on Thursday, May 20, 2010   •   Category: Antennas


A modified version of the simple dipole is the folded dipole. It has two half-wave conductors joined at the ends and one conductor is split at the half-way point where the feeder is attached. If the conductor diameters are the same, the feedpoint impedance of the folded dipole will be four times that of a standard dipole, i.e. 300 ohm. The height above the ground The height of an antenna above the ground, and the nature of the ground itself, has a considerable effect on the performance of an antenna.and its angle of radiation. See PROPAGATION A dipole antenna can be arranged to operate on several bands using other methods. One way is to install "traps" in each leg.


1.2 - 12V / 1A Low Voltage LED Indicator Power Supply with LM317
Posted on Thursday, May 20, 2010   •   Category: Power Supplies


This is a 1.2 - 12 V, max 1A power supply with a low voltage indicator LED. The indicator part incluedes three diodes and one LED. For example you are charging a battery, you can observe the charge status at that moment. Another advantage of this circuit, when the drawn current exceeds 1A (practically 0.85A), the current protector in LM317 intervens and LED indicator warns you about the very low output voltage. Be careful while choosing the transformer. Most of the products are specified as 10VA but their outputs are not as said. Another good property of this circuit is the mains noise does not pass to the DC part.


Digital VGA Switch
Posted on Thursday, May 20, 2010   •   Category: Video


Digital VGA switch for switching between two PC monitors with MAX465 IC.


Ground Pole Antenna
Posted on Thursday, May 20, 2010   •   Category: Antennas


This Antenna is most widely used all over the world. For example, when you see a police car it has a transmitter with Ground Pole Antenna The body of car serves as ground). It accepts load from 50 ohm source and has larger power output than Half-Wave Dipole Antenna.


TV Transmitter with Audio
Posted on Sunday, May 16, 2010   •   Category: Video


TV transmitter consists of of the two sections: video transmitter and audio amplifying. Both of them actually is transmitters. The main one generates video carrier while the smaller one generates the exact 4.5 (5.5 in some countries) MHz FM audio carrier. When it is supplied to the main section, the combination generates the audio carrier that is the total of the video frequency plus 4.5 MHz (this is the same in the US but different in other countries: 3.5 in the UK, 5.0 in Italy, 5.5 in Australia and so on: see the channel plans).


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