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  1. B

    Light sensing with BPW34, TL074, and Arduino

    https://forum.arduino.cc/index.php?topic=151824.0
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    adsl+ wiring question

    Put a repeater half distance (or a hub). Other than that, fibre optic. As you say, 100 metres is the max. including fly leads.
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    Trouble with solder

    What are the "two components" what material type , what size, how big (wattage) is your iron?
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    I need a looping digital timer

    There was no mention of cost that I saw, just they wanted ideas on how to do it.
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    I need a looping digital timer

    Arduino pro mini, small battery, start switch and a piezo buzzer.
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    Has utility power been restored?

    Hack into a no contact volt pen......
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    Smoke detector in sealed attic

    A guide to smokies...... http://www.fire.nsw.gov.au/page.php?id=589
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    Panel display for 10K pot

    Arduino and a small program can track a pot position and return a number that represents the voltage level on the wiper (0 to 1023) This could then be used as a reference to drive an LCD. Voltage on the pot is limited to 5v dc though. If you require different numbers you can "map" it to suit...
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    Good book for Electronics

    Try here...many to pick from.............. http://www.talkingelectronics.com/te_interactive_index.html
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    Charging coin cell battery and feeding the board circuit at the same time

    I was thinking along the lines that other manufactured packs have i.e. encased monitoring with feedback to the charger or cut-out in event of over-temp or over-charge.
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    Charging coin cell battery and feeding the board circuit at the same time

    Only issue I can see is that the Lithium Iron cell has no protection and given they have a history of bursting into flames for no apparent reason, I'd be thinking about that.
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    resetting BIOS from motherboard

    There is a difference between resetting the bios ( to factory defaults) and clearing the bios chip ( as you are attempting).
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    Shut off timer

    555 timer with a mosfet on the output and a couple of resistors and a capacitor...plenty of circuits around for a monostable. http://www.talkingelectronics.com/te_interactive_index.html http://www.instructables.com/id/555-Timer/step2/555-Timer-Monostable-Mode/ or an Arduino ....
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    Crazy situation with reconditioning batteries

    I doubt it.
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    Replacing power supply for halogen bulb

    When installing dichoric lamps (similar to halogen) in hospitals where Clipsal Cbus was present, we would use a type of inrush filter per x amount of lamps. Extended their running life ten fold. Cannot find a link to them at present though. They were housed in a standard Clipsal electrical J-box...
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    Shut off timer

    Old mini-oven mechanical timer...??
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    Crazy situation with reconditioning batteries

    In my experience, digital multimeters (especially cheaper versions) can give unexplained readings. Must remember they have thousands of ohms input impedence. Try loading with a 10k resistor or similar(my bet is the reading will go to zero) Or use an analogue meter (same..zero) Could be...
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    Mains filter/conditioner schematic.

    You might try running your systems off a UPS that gives isolation. Could be a rather large unit though. You will need to find what the power requirement of your system is under max conditions.
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    Irregular waterproof cable glands

    Just a thought, as your enclosure is immersed in ice water you may get condensation forming inside your enclosure.
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    Servo motor acting strange?

    Servos do not take kindly to the supply being reversed. I would say that in reversing the brown orange and red that you have blown the main board somewhere. One other query, why is there a green wire on a terminal marked "red"..and black and white transposed??
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