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    What's this? (retroilluminated mobile phone screen)

    Thats "EL foil Backlight" These usually need a high voltage inverter to work
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    PIC 16F877 PROGRAMMING IN C

    first you must get a C compiler for PICs. Then you search documentation for your compiler. Most compilers have official or unofficial user forums where you can find code examples, tested libraries etc
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    Hard dsk motor

    check this http://home.cc.umanitoba.ca/~umparekh/hard_drive_clock.html
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    Electroneuro stimulator

    get a 555 running at 5khz throught a tranzistor drive it to the 12Volt winding of a normal 230V/12V transformer. On the 230V winding you'l have high voltage, enough to feel it. I AM NOT RESPONSIBLE OF ANY INJURIES YOU MIGHT HAVE.
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    Microwave LCD is very dim.

    these lcds usually have a rubber conductor to communicate with the main board. In most cases this rubber does not make good contact and the lcd looses its contrast. To fix this try cleaning the rubber and contacts with clean dry cloth.
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    BIG EVENT IN GREECE

    Happy birthday geitona....!!!!!!!!!!!!!!!!!!!!!!! :o :o ;D ;D ;D ;D ;D ;D
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    opamp won't output zero

    There is an error in the inputs. It is caller Vio (Input offset) usually it is some
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    Problem with my breadboard

    Simulation is always simulation and it is very difficult to get exactly the same results in theory and on the breadboard. Have you used the ideal components of the multisim library or the typical library with  possible tolerance??
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    solder

    Do you know the word availability????
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    conventional schematic help

    Google for: Ohm's Law and Kirchoff law See also: http://www.ibiblio.org/obp/electricCircuits/index.htm
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    solder

    For good soldering: -Hot iron (but not too hot to destroy pcb tracks or component 300-350c is good) -solder with fluxed core. The other ones are headache...  The solder must be 60% of Sn and 40% Pb -Practice, and more practice
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    Tavern-meeting in Thessaloniki [4-6-2005]

    Ante Sorry no pictures shooted in this meeting... I didnt got my camera, i supposed mixos would bring one...
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    Tavern-meeting in Thessaloniki [4-6-2005]

    Hey 20:00 is almost day. Now in greek...
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    LED panel tester

    The current monitoring I think is better and not so difficult. You must measure the voltage drop across the led current limiting resistor. If this voltage is over a user selected maximum level, an alarm is generated. The circuit could consist of an opamp with adjustable offset
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    Tavern-meeting in Thessaloniki [4-6-2005]

    I'll be there!  ;)  ;)  Ouzou Melathron is the best. We must make a reservation for a saturday night in order to find a table. We 'll see... :o :o
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    perfboards

    I think that breadboard is the best for prototyping, because you can change everything in a minute without desoldering anything etc. Yes you might have many wires (look like spagetti.. :P) but if you want to test something it is very useful. I use breadboard in all my electronics education...
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    SIMPLEST LIE DETECTOR

    No cost Lie detector: -Get ur multimeter, give to the person to hold the probes in each hand steady. -Put the multimeter to the MOhm scale (usually 2Mohm is ok ) and you will see a value. -If this value increases the person says the truth. -If this value decreases the person LIES...
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    TV cable connections

    Go and ask for "
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    TV cable connections

    Go and ask your techician what is the tv cables impedance. He will propably wont know. Are your televisions have good reception? When they are both ON?? Go and buy a 2-way splitter (I think its called like this my english is baaad). It has three connectors, of whitch one is input and the...
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    Spray Etching Machine

    You may use a windshield pump and a sprayer like these azax bottles that are plastik. These sprayers usually have a metal valve in them but we dont need it because it is used only for pumping the liquid from below. Maybe it is nessesary to keep the lever pressed in order to allow fluid to be...
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