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    Make a Microwave oven on a small-scale

    What's cooki'n dok? ;D hope this helps http://repairfaq.ece.drexel.edu/REPAIR/F_micfaq.html
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    KVM switch circuit / Multi-pole double throw switch

    If PS2 Keyboard & Mouse are used then The device provides a clock & a data line (similar to I2C check http://www.networktechinc.com/ps2-prots.html.) So we have to switch only the data line. By buffering the clock line to both PC's we can insure that PC assumes a device is present on...
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    Laser Applications???

    Ante you are right :) Check out http://auto.howstuffworks.com/question396.htm. It would be interesting to see what electronic they use to measure the short intervals involved. ;D
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    Laser Applications???

    In the first moon mission they put up a mirror on Moon. It was used to measure the distance between Earth & Moon accuratly by bouncing a LASER back from that mirror. As the speed of light is tremendous (3*10^9m/s) you can not use LASER to measure small distances. Maybe you can measure above...
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    PCB software

    Eagle is much like the vi editor irritating to learn but extermely powerful when learned ;D I am now trying to learn the user language programming in it seeing all the other kool utilities on their site
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    PCB software

    You can use File->CAM Processor menu in board to generate all the data you need. If you have downloaded eagle manual pdf file then you can read a few pages from page 210 onwords to get an idea how it works. There are sample CAM Jobs in CAM directory inside eagle installation directory which...
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    Designing a computer based voltmeter

    First of all i am sorry because i have posted a half-cooked link. The link to bas file is not working >:(. I didn't checked that link prior to posting. Anyway, the AVR used AT90S4433 has in built 6 channel ADC. So accepting analog voltage is no problem. (however atmel recommends you use...
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    infrared link for mobile

    Usually the COM2 port of a computer can perform the IRDA function. (tht is your IR data link) on most laptops IRDA port is directly available but on a PC you would have to change your BIOS settings to make COM2 ready for IR link &b ofcource you would need a suitalbe connector.
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    Designing a computer based voltmeter

    Sorry if i confused you but i have found a better link :D http://www.qsl.net/zl1bpu/micro/SerialDVM/AVRDVM.htm this projects uses Atmel AVR uC i could not find one using PIC sorry :(
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    mercury switch

    Found some info abt magnetic reed sw here http://www.allaboutcircuits.com/vol_4/chpt_4/2.html but there is no diagram to illustrate it :(
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    Facsimile Machine

    I don't know about the standalone fax macine but if your modem is data/voice/fax modem then you cam connect it directly to send & receive fax. Windows xp supports such operations directly.
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    Designing a computer based voltmeter

    You need an ADC & a microcontroller if you want to put data through USB or serial port. However for parallel port you can get away by using ADC & some logic chips. The selection of ADC will depend upon the resolution you want you can use any 10bit or 12bit ADC with integrated mux for the...
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    Cold Heat Soldering Tool

    Now that you are mentioning the sparks, i have a story to tell ;). Some years ago in a magazine named Electronics For You (in India) i read an article. It was about making a solder gun from a normal wooden pencil. The recipe was like this. You will need a 12V/1A DC power supply (filtering is not...
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    Coil levitation device and electromagnetic launcher circuits

    :-(
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    Simple RC circuit problem

    http://cnyack.homestead.com/files/afourse/fs-io-tr.htm
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    pwm in stepper

    The effective voltage generated by a PWM is directly proportional to the Duty Cycle. The relation is - Ton * Vpeak Veff = ---------------------- Ton + Toff The DC motor can be controlled by using this voltage. However this is not the case with stepper motor. If you...
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    Wall Follower............

    http://www.roboticsclub.org/fwr/avoid/
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    File types and sizes

    I had same problem posting one ckt.JPG file when i changed it to ckt.jpg it worked! The routine which checks file extensios may be case sensitive (& windows is not) )so if you are using windows always double check the extension. ;)
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    Coil levitation device and electromagnetic launcher circuits

    Can i make a railgun from this ;D
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    Experimental high voltage bridge rectifier

    how would you check the output is DC or AC?
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