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    My computer is slowing down!!

    Don't use XP restore. It is better to turn it off. If you have ever cleaned the system clean of a virus & then performed system restore to patch things up, it will unleash the virus again. No antivirus can look into the files catched by the System Restore feature. & it really messes up...
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    over unity is here

    this is the longest post i have seen :o
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    PC oscilloscope useful or not

    Here is a possible recepie, You will need a really fast ADC to sample the input waveforms then a fast SRAM or FIFO to store the captured samples & a microcontroller to transfer the captured data to PC. On PC you can process the waveform (fourier, rms, peak, avg, freq, etc.).
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    0-20 (3A) and 0-40 (1.5)A Power Supply (Elenco)

    TEN MOSFETS :o Ante, can i reduce number of mosfets or better yet how meny IRF540 will i need? I think i am going to try this.
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    My Avitar

    I liked the old wizard thing. It even had a jet of water (or was it something else ???). Any way i think everybody here is on "I am changing my Avatar" spree ;D. Is there a contest for the coolest avatar? I hope not. ;D
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    ultrasonic mosquitoes repeller

    I tried about the same transistorised circuit a few years ago. It worked successfully for a day or two & then mosquetos got used to it :o. What the hell i tweaked the RC values to change the frequency (by how much i don't know :() but no avail. Hope it works for you. ;D
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    The LM317 Calculator

    Thanks, audioguru & MP but u missed the point. Well i learned elementry maths early in life & can do it well (i belive ;D). But i like to rest my brain once a while & let the computer do the dumb stuff. Thanks for the LM117 & LM317 tip uptill now i almost always used 220E. But...
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    The LM317 Calculator

    I liked the LM317 calculator on this site (http://www.electronics-lab.com/articles/LM317/index.html). But i have one suggestion - please make it calculate one resistor frem the o/p voltage and other resistor coz usually that is needed. ;D
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    Inside a TO-3 Transistor case

    I used the SL100 with it's top chopped off as a phototransistor (2N3055 was too heavy for my hacksaw then ;)). It gave good response indeed. But beware you have to cover it with some material to keep the dust off else it will die slowly. ;D
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    Notch Filters and Noise Cancellers

    Put that notch filter afer the pre-amplifier. i.e. just before the volume control. Are you sure it's 120Hz buzz? It seems more like a RF interference.
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    regulated 12 v dc and 500 mA current o/p

    what do you want constant current or constant voltage? http://www.electronics-lab.com/projects/power/008/index.html i think this should help if you need constant voltage. but 7812 will do a better job.
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    Adams Motor Project

    Voltage increse is ok but what about the direction of current is it going inside the battery?
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    Infra Red Remote control

    check this out http://www.wimb.net/index.php?s=electr&page=7
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    remote control using radio freq

    Check this out remove the IR parts & place RF communication link it might just work ;D http://www.wimb.net/index.php?s=electr&page=7
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    How Hard to Use Floppy For Flasher?

    Not worth the trouble ;D. Most systems based on microcontrollers are meant to be small & inexpensive. Interfacing a floppy drive would take extra hardware on board. If you want portability you should try using a flashcard / USB stick. Anyway that's my view :)
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    What Chip Converts Decimal to Pulse ..?

    A microontroller & a few lines of code will be sufficient here. Unless you require very small pulse duration. A digital circuit may also be build by using counters & gate but cost will be higher than microcontroller solution.
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    I need help with my project...

    You obiviously need an RTC here to keep track of the current time (DS1307 is the simplest). LCD & keypad or a serial link may be used to set the current time. A microcontroller for keeping things in control (PIC or 89C51 take your pick).
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    12v lamp Dimmer lamp ideas?

    I know this is an overkill ;D but check this IC out http://www.alldatasheet.co.kr/datasheet-pdf/pdf_kor/LSI/LS7631.html
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    single phase controlled rectifier for DC motor

    Hope this helps this document dose not gives direct DC voltage => Motor Speed circuit but has potentiometer controlled circuits. http://www.littelfuse.com/data/Application_Notes/an1003.pdf
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    Protel DXP PCB Question

    I think Protel DXP provides an autoplace option but it's not very easy to use. However there is a software dedicated to auto placement check it out http://www.eda.co.uk/actiplace.html.
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