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  1. B

    Controlling Motor with 0-10V input

    Good place to start............... http://www.electronics-tutorials.ws/blog/pulse-width-modulation.html
  2. B

    Help with comparison of DMM's.

    Never heard of a flux brand. Do you mean Fluke? Anyhow, all depends on the range of your application. i.e. low voltage electronics, plug in portable mains powered equipment, etc etc.
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    Rotary sensor with logic output, kind of...

    http://www.learnabout-electronics.org/Oscillators/osc45.php Use a hall effect switch such as Allegro A1120 with open collector with a resistor to the positive rail, tap at resistor open collector junction to the 555 trigger.
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    Help With Correct Power Supply

    With low voltage (12v) you biggest enemy is voltage drop so use a large diameter cable, maybe 4 sq.mm (7/.085) Just be aware that automotive cabling is sized differently than the building wire size quoted above. The automotive is much smaller conductor size. Really depends if you intend to run...
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    Need a food safe waterproof insulator to repair Buffalo water heater

    Without any diagram or photos of the setup, only guessing, perhaps if the scale build up was everywhere, maybe it's causing false probe readings somewhere. I'm hesitant to advise your bypassing/ isolating of particular sections as this is a mains powered device and you could quickly get into...
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    Connect 24V 2wire sensor to 5v Logic

    You could connect through an optoisolator as shown in the data sheet for PLC connection. Adapt to suit your application.
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    Arduino as sensing device

    10mA ...not much...could be the clock, or alternator exciter. Voltmeter is not going to be much help. For ammeter you could look at the many available hall sensors. Range might be the hurdle though...
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    Need a food safe waterproof insulator to repair Buffalo water heater

    Think you will find the three probe system works this way.... long probe common short probe stop medium probe start In effect, water fills until it reaches the shortest probe and stops. As level falls, it turns on again at the medium level, until it again reaches the shortest probe. We used to...
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    Use plug / jack with K Type thermocouple?

    At Sunwater we used to use din rail terminals which used the same material as the cable (iron and nickel i think it was) They came from Sprecher and Schuh but there would be others.
  10. B

    Réfrigérateur whirlpool

    All refrigerators have a temperature control of one type or another. Running continuously will freeze everything and cost you a small fortune in electricity. The type of thermostat and the location of it will depend on the type of refrigerator. 1. Standard old single door type with an...
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    Audio transformer for crystal set help

    Seems easy enough to find ...Ebay http://www.ebay.com.au/itm/EI-14-Center-Tap-Audio-Transformer-1K-32-1K-8-ohm-3-5K-32-3-5K-8-ohm-FSe-/151831457422?hash=item2359dc2e8e:g:kt8AAOSwuTxWCM0G
  12. B

    supply electrode with the humidity of the soil

    http://www.simplecircuitdiagram.com/2010/10/19/cd4093-water-level-sensor-detector/
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    Is it possible to power relay and relay circuit with same battery?

    Most micros can only handle 20 to 40 mA on their output pins, depending on how many outputs you are using as well. So best to stick with the layout Davenn showed you above. Also it is best to draw your circuit ideas as it can be much clearer what you are expecting to do. I've just taken a punt...
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    Is it possible to power relay and relay circuit with same battery?

    Could not open the link for whatever reason, however, depends on the Arduino model, they will accept (up to) 12v on the raw input and 3.3v or 5v on Vcc (depending on the type)
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    Scary...

    I agree. As I have noticed in all walks of life, some invariably think that study of basics is a waste of time and want to ride the express elevator to the top. In my day, learning was trudging through masses of books to find answers and learning step by step and I must admit, the internet and...
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    gain amplifier

    You need to supply the chip with power.
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    ac motor pump control using microcontroller ?

    1/2hp single phase motor about 5 or 6 amp full load....allow 4 to 6 times starting instantaneous current so 20 amp relay should do fine.
  18. B

    110 to 12 volts reduction help

    In most countries, putting together and selling anything associated with mains supply requires appropriate licencing and qualifications. In many instances, rather costly to accomodate which is why I suggested the commercially available product.
  19. B

    110 to 12 volts reduction help

    On the first hand, I very much doubt you will build anything as cheaply as you can buy a commercially available product. On the other side is the fact it would also be far safer, as 110v can be very dangerous in inexperienced hands.
  20. B

    Trying to design a system that provides 0v-4v voltage on one wire, and invers 4-0v on another.

    Seems you already have it with a dual gang pot. Wire the 4V to one side of one pot (say terminal 1) and the opposite side of the other pot.(say terminal 3) Ground the same only to terminal 3 on the first and terminal 1 on the other. Two signals (one from each pot terminal 2)will then be...
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