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    LED Display digital clock project

    It won't be accurate, and you will have to correct the time daily! Use on of the designs that has a crystal reference. Watch type crystals are common and cheap.
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    Laying out a strip board

    When I started reading electronic magazines "Everyday Electronics" and "Practical Wireless" many years ago it used to be called VERO-BOARD
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    Simple multimeter question.

    I understand this part below and gave my views on this. First of all, I aquired this analogue multimeter, but I'm doubting it's accuracy
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    Simple multimeter question.

    The issue in question was about the accuracy of his analog meter and not whether he should learn how to use it. I learned to use a slide-rule long ago but prefer my calculator today.
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    Simple multimeter question.

    Why bother with an analog meter? Digital meters are available for a few $'s that will have orders of magnitude better accuracy than an analog meter. Analog meters usually have fixed 1% or slightly better custom value resistors in their divider circuits which makes any calibration difficult. Even...
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    switching high voltage supply

    I have used this before in HV measuring applications http://news.thomasnet.com/fullstory/14235/612
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    Are datasheets important?

    I will say this in a Q & A session:- Are there questionable design practices involved? Yes, whether we like it or not. This is just not the way things are done by power electronic designers. This may be due to the fact that this is not the area of expertise of the creator of this design...
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    Are datasheets important?

    I would not use bipolar power transistors in a push-pull configuration period! (many hidden problems to the inexperienced, especially at high current levels) I would not use 50/60 Hz inverter transformers. (too bulky) The 4047 would be last on my list of choices. (hate RC timing constants...
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    Are datasheets important?

    As I stated before, I use data sheets as a guideline only. I have saved companies loads of money by designing and redesigning products to use lower grade components. The important part is to understand what parameters may be exceeded under which conditions and to design around the limitations...
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    Laying out a strip board

    One was called stip-board magic. Company went belly up years ago, but program may still be available on the web.
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    Timer with Beeper for Intravenous Drip

    This would be a very easy task for a micro like a PIC or the like
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    12 V DC to a 220V AC Inverter AMplfier Design

    If you read the description you will notice a) One adjustment to set the output operating frequency for 50 or 60 Hz inverter b) One adjustment to set the on-time of each device. On-time can't be more than 50% of total inverter cycle time because of push-pull operation.  If you use the crystal...
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    Electronic Stethoscope

    This is worth a try. I have not tested it *-------------------------------------------- * NO-FRILLS LM386 MODEL * Dave Dilatush 5/30/95 * PSPICE analysis statements: .probe .ac dec 20 1 1e7 .tran 1u 3m 0 5u * circuit to test the lm386 model: vsupply vcc 0 dc 9 vsignal input 0 ac 1 sin 0 .05...
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    12 V DC to a 220V AC Inverter AMplfier Design

    The designer thought if the cap can work for a 555 it should be good for this as well  :)
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    Modifying a Belkin Tunecast for more transmit power

    http://www.jiggybyte.com/IndexAnon.php
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    12 V DC to a 220V AC Inverter AMplfier Design

    I think you are missing the whole point.
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    12 V DC to a 220V AC Inverter AMplfier Design

    It shows that you can have much better control over the output that a fixed duty cycle drive.
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    7 Segment LED Counter, Need help!

    That part model (7447) in Multisim is known to be faulty over a few issues. Even in the latest release it is still not working. They never bothered to fix it. Use a 74HC4543 or 4543 to get it working
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    12 V DC to a 220V AC Inverter AMplfier Design

    Also look what I described in this post http://www.electronics-lab.com/forum/index.php?topic=10858.0
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    Simple inductance tester

    From the latest EDN magazine "Cheap and easy inductance tester uses few components" full article here http://redigitaleditions.com/Repository/EDN/2007/04/12/EDN070412.pdf#OLV0_Page_0111
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