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    FM WAVE PROPAGATION

    FM wave will reflect by ground...... why not? ??? And the destructive interference is mainly caused by the delayed reflected wave (multipath) + original wave received by the receiver. (for example, in some area, TV set will get some "ghost image" due to the delayed signal mixed with the...
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    Pb-free soldering

    What I know is, the soldering temperature need to be higher (or time longer) and this may bring problems to some components with poor thermal resistant.
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    series/parallel circuits and dividers

    Just give you some hints: 1. Try to make use of the ohm's law. 2. Do not calculate the total current in only one equation. 3. Try to divide the whole cirucit in parts and calculate their voltages and currents. 4. Note that at R6, the voltage across it is the same as the battery voltage. Other...
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    in search of a FM STEREO transmitter

    rasOfir, You have to try especially you build by yourself. I think no one can guarantee the quality..... If you require high quality sound.... then.... don't put too much expectations.
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    How does Laptop PS work?

    1. I am not sure what you are mentioning about. But those adaptors are mostly switching mode power supply with low current ouput. 2. cylindrical part on the wires are ferrite which used to shield the high frequency noise that may affect the digital data transfer .
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    in search of a FM STEREO transmitter

    FM transmitter is a bit complicated, you will face a lot engineering issues esp. you do not have any RF equipments.... It is not just soldering...... but a lot tuning and testing.....
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    i need help

    It is very strange that you can build the hardware without a software consideration....... :o No one can able to help for no circuits, no general info........ And no one can help if you don't give any try on your own coding!
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    2SA933 Datasheet

    google already give you the answer............. Edit: attached 2SA933.pdf
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    Subject Line Descriptions

    It is a good idea...... at least, a clear subject title can save us some times in click into those we interested. And be honest, some of these posts are just homework.... sure we won't like to work these out for others studys.
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    wireless transmitter

    Alun, I don't have much frequency drift for my 453MHz LC transmitter with voltage variation...... I found that if I use normal variable capacitor to the LC tank, it will drift about 2 to 4 MHz..... but when I use a trim capacitor (I think with better accuracy and temperature variation ) the...
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    wireless transmitter

    What I mean is, how to measure the power received by the receiver? A standard receiver?? A spectrum analyzer? The RSSI output of the receiver (if it does have)? Receiver audio output (it won't work I thnk)??? Also... is the receiver got a reference antenna? More is, how to measure the...
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    "Desperate Housewife" with Remote Control Project

    It is hard to comment without the mechanism of the frame and the panel worked by the carpenter. ::)
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    wireless transmitter

    hmm.......... how do you measure the path loss with the receiver?? just wonder what method you are using........
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    FM WAVE PROPAGATION

    Use directional antenna..... you can improve the distance by 30 to 50%
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    LM78XX & LM79XX questions

    I got a mobo with electrolytic capacitor dried out...... It can boot up after a few try but will crash in a second.......
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    wireless transmitter

    can you give more details about your circuit and the frequency it operated at?
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    articles on USB

    The article section of this site has some good article for your reference: http://www.electronics-lab.com/articles/index.html also, you can find more info from http://www.usb.org/developers/docs/ with lots of useful information
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    Glue vs. Silicone

    Just a reminder, the hot melt glue cannot withstand massive sunshine ....... it will easily fall apart after sometime.
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    newb transistor question

    for fast checking....... just build that transistor circuit on the breadboard....... apply 12V to the the collector side while 5V on the base and see if the LED can lit or not.......
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    Ground a astable 555 at startup

    I think you can make use of the LM555 pin 4 reset pin to reset the ICs while they are powered up. Just simple RC can do.
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