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    mercury switch

    how about a magnetic switch, some step counter use it. Also most now use plastic arm to do so. I will try to search my old stuff to see if I can get you a picture of these mechanism.
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    LM317 Variable power supply

    The higher the power dissipated by the regulator, more the ripples at the output. It is what I learn from real product design. So my experience is the input voltage usually 20% more than the specification required in order to give that 20% safety margin. It will not cause much heat generated.
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    Longwave Radio Circuits

    The structure of Long wave radio receiver should be more or less the same as that of AM radio. Just the difference in frequency and the corresponding coils.
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    design and construction of intruder alarm with security light

    There are many types of sensors but I have no idea what you want. Please give more details.
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    Simple RC circuit problem

    nice link...... thanks!
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    Wall Follower............

    hmm...... that circuit may affected by ambient light source.... using a frequency source to lite the IR LED may do a better peformance.
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    Wall Follower............

    It sounds like a maze mouse project..... ;D
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    remote control using radio freq

    I think I am wrong...... because those ICs I mentioned isn't operate in 1.5V...... And I think it is quite difficult to source for radio IC which operates in 1.5V for howbrew...... I am playing now with Toshiba TA2104 but its minimum voltage is 1.8V........ :-[ And MC3361 and MC3362 are not...
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    remote control using radio freq

    Good to hear you have good progress ;D And for FM receiver, you can try to use simple FM radio receiver ICs. They are served you well (for which your FM transmitter is within the broadcast band 88~108MHz) ICs like TDA7000, TDA7088, MC3361, MC3362 may fit your needs.. Hope this help.
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    Dose your LCD rolls?

    Try to add a resister (say 10ohm carbon film; 1/4W should be ok except you need to drive high current components)/choke coil (10uH I think is ok) between the supply and the unit, plus a ceramic capacitor to ground. This may help a little bit if the ripple of the supply is high.
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    My computer is slowing down!!

    Ante, I am using XP professional SP1. Problem..... already solved by reinstallation. But really, if XP are in trouble, it is very painful to recover it. I do agree WIN2000 is very good and stable.... However I think most stable one will be DOS6.22 + Windows 3.1 era..... :P
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    My computer is slowing down!!

    XP doesn't have a startup floppy....... but I can bootup XP installation using CDROM
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    Convert Current

    the marking on the battery is showing mAH, i.e. milli-ampere hour. By dividing it with the current drawn by the unit, you can guess how much hour your unit can use (for the battery is fully charged) So it needed not a supply to give out 800mA for your application. Just a simple regulator...
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    Best design software and board lab

    PCBExpress and PCB123 aren't that free as the only way to get PCB or gerber file is to pay them.... Eagle is good, but I just play with it a little bit. Can't give much comment to it.
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    My computer is slowing down!!

    Ante, noope, I am not giving up. For example, recently, my computer (windows XP) mess up with some dll file corrupted. Even I try to perform a system restore or start on a safe mode can't success.... i.e. can't bootup windows.... thus my way is to reinstall it..... without another choice. of...
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    project ideas

    may be a light chaser can have some fun 8)
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    My computer is slowing down!!

    The final solution of windows trouble is to format and reinstall it.....
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    Voice-Activated Door Opener

    if it is just a sound activate door opener, then you can use a relay and a electronic lock and a sound activate circuit. However, if you want to have voice recognition, it will be a much more difficult one. It will be another issue. Most likely, you need a fast processor or even a PC to do so.....
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    ultrasonic mosquitoes repeller

    Here is the draft circuit diagram of the repeller I have. Hmm.... it just buzz.... and I heard the sound....... :P I can't guarantee it works on repel mosquitoes...... it is just for fun only..... and I haven't rebuild one myself...... The NPN transistors are SMT components which marked L6, I...
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    Datasheet Archives

    In case you know chinese you can try this link to search http://www.hqew.com/document/
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