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  1. B

    Push Button H2O - Reversing Polarity

    Perhaps an R/c tx rx from China with a receiver controlled on off switch. Many ways to achieve what you want but the advantage using the above is there is no building or programming to do.
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    Drift issue in capacitance measurement, why?

    Start by putting details of the board here so others can see the specs. At least a link to the board specs. Otherwise the best others can do is a wild guess.
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    Electronic System Design

    To me it seems the Op wants "what is inside" and how it operates. Just not prepared to do the long haul of study that other have done.
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    Soft start / stop for 230v LED trailing edge lights

    Have a feeling I've seen this here before. At any rate, these LEDs mostly require a certain type of driver to be able to allow dimming. Then, the dimmer has to be suited as well. Think you will find it's just one of those things you cannot get with the gear you currently have.
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    Laminator for PCB's ?

    Yes, the rollers were my main interest. Familiar with building machines. Below is link to just one. http://www.cnczone.com/forums/i-c-engines/30633-cam-grinder.html
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    Four way UK traffic lights

    http://www.555-timer-circuits.com/traffic-lights-4-way.html
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    Power Relay needed

    Most LED's need at least 1.5v to turn on.(1.7v standard red LED) Are you powering the drive to the LED from another supply?
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    Laminator for PCB's ?

    Wondering if there were any further details on the build/ component supplier for this machine?
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    Early MOSFETs: why P-channel?

    Section 11.3.3 www.ee.nmt.edu/~thomas/data_sheets/op-amp-slod006a.pdf
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    Uses and function of pmosfet &nmosfet

    Very similar to pnp and npn device differences in application. For the mosfets themselves, they are a voltage operated device and in most instances fairly simple to design into a circuit. Whereas transistors (most would agree) are largely current operated and can require careful selection of...
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    Electronic System Design

    What is a "hnd" ?
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    Stepper Motor Help

    I think overcoming a wobble in a shaft may be the least of your worries. There are masses of stepper drivers out there in Ebay land, as well as circuits on the net. No need to re-design the wheel. Just need to match with the motors you are using and matching up power supplies and any current...
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    Was, Were, Wasn't and Weren't

    I wouldn't be too concerned there. By the look of the amount of junk mail one sees (at least half a tree per letter box I'm guessing). Plus the fact that every time one needs to keep a record, one has to "print" even though the banks etc. say they are discontinuing paper transactions. Even ATM's...
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    Electronic System Design

    Fact of life....everyone starts at the bottom insofar as knowledge is concerned.
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    Stepper Motor Help

    Why bother with stepper motors when geared dc motors such as shown will do for a lot less outlay and no need for controllers of any kind unless you need further speed control? Even then the speed control units are relatively cheap. There may even be cheaper motors that that shown...
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    Controlling a shower pump

    I don't see the need for the booster pump actually. As a quick note....I used to slip outside and turn off the water supply to the HWS ...cold water shock a couple of times cured the "kid-in-the-shower-too-long" problem.
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    Toggle Switch - Momentary Pulse Circuit (problem!)

    I'd say get the relay clicking first then add your LED circuit afterwards. Obviously you are getting confused on the operating requirements so one bit at a time will help you. Just a note.....some of these small 5v relays are polarised, I've been caught with that before.o_O
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    Help with controlling 2 dc motors using microswitches

    In an electric circuit sense.....easy. Getting the microswitches to activate mechanically I would imagine a nightmare. Logic control perhaps. Microcontroller ...relatively easy. (Just my 2 bob's worth)
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    Push Button H2O - Reversing Polarity

    Flip flop circuit?
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    Home Security system takeover

    Unplug the phone cable perhaps?
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