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    Making PCBs with magazine's paper

    I used for a while FeCL3. It leaves yellow stains everywhere, I hate that. It also takes a lot of time. requires hot water. Now I am using Peridrol+something that I cant tell it in english. It is quite fast. It is easier to see through. It does not need any water. When I'm done i store it for...
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    Monitor's Led blinking

    Check the cable from the pc to monitor. Maybe the monitor gets no input and stays in stand-by mode.
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    FREE Catalogue

    Microchip and Maxim also sends free cd catalogs. Search for free literature.
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    IR receiver modules, why 38kHz

    The 38Khz signal is only the carrier of the signal. Commercial IR receivers (like TSOP17xx etc) give as an output only the data and they filter the carrier. So the rest circuit has nothing to do with the 38Khz carrier.
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    Simple plasma tube experiments

    Cool! ;) ;) I didn't understand the construction of the whole thing... When you will do it again take some photos!
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    Hameg HM205 Oscilloscope Manual

    20 years old? I don't think so. 2years maybe. We have the same oscilloscopes in a lab at my school. they don't look very old. I don't think the technology required for this machine was invented 20 years ago... by the way, where did you get it and how much?
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    Making PCBs with magazine's paper

    Before some time I was looking for a method to make pcb's, and I saw this method. I tried it with a simple text photocopy that I had and the results was not bad. The text was transfered on the copper and was etched nicely. I didn't tried this method more because I don't have a laser printer...
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    Timer Circut Help

    Check this simulator of 555 timer. 555simulator.zip
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    Led display Digital Voltmeter question

    You can use the TC7660 (from microchip I think ???) which is for this job. It takes gnd and +5V and gives you your -5V. ;)
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    How to read .ps (postscript) files

    I think you can them open with Corel Photo Paint or Corel Draw ;)
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    What this symbol means?

    What is this cirquit designed for? In the parts-list is it mentioned?
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    Delay introduced by amplifiers

    What you need is Dual Channel Oscilloscope. Put exactly the same signal in the inputs of the amplifiers (sine wave is preffered), and connect the oscilloscope to the outputs of the amplifiers by two at a time. If there is a delay you will see it. In Higher frequencies will be more obvious.
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