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  1. B

    UV LED PCB Lithography Exposure Unit

    I tried it donkeys years ago but had anything but success. Used a gang of 8w fluro tubes but found out later that the pre-coated board which came from Dick Smith could have been sitting on the shelf for a year or more. One would expose to the uv for a given time(experiment) and then spray with...
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    12V to 33V Converter

    On off...?
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    Why are mains plug pins usually made of brass in the UK?

    I think most is a compromise between cost, manufacturing and wear and tear. No mention was made of the difference in materials in the actual sockets between the UK and US so perhaps the answer why the UK ones seem to burn out. Usually burn out plug/ sockets here in Aus are due to old worn out...
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    KJD 17 wiring to 230vac single cap motor question.

    Yes, current draw....... not to be confused with voltage as you seem to be.
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    Load resistor for 12V battery

    12w light bulb
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    Aquarium lights and fan

    2 options .................
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    Homemade 555 Tachometer

    Some on Ebay........... http://www.ebay.com.au/itm/12V-Hall-tachometer-display-module-Stopwatch-speed-counting-module-/301724563351?hash=item46402f7797:g:nJMAAOSwQJhUhBxH Or......make your own 555 http://www.talkingelectronics.com/projects/50%20-%20555%20Circuits/50%20-%20555%20Circuits.html#16...
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    Aquarium lights and fan

    DC or AC..? low voltage or mains supply..? 3 way switch..?? think you mean 3 pole switch....either way a 2 pole single throw on each would do BUT it depends on the above..
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    Speed controller

    Cost of buying parts alone would be way in excess of what you can buy already built. Depends on your motor size but this one has a very broad input/output range and can handle 8 amp continuous for a bit over $7.00 with delivery...
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    KJD 17 wiring to 230vac single cap motor question.

    Along with getting a reading and work out which is which, really need to wack a tong meter on it and see what it is doing before you cook it.
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    Strobing lights before/without a timer (like the 555)

    Most had one bulb similar to a glow switch ( fluro starter) in series with all the other lamps. Used to dread Xmas time when all the rellies of the boss would bring in their tree lights to get fixed. You can guess who copped that job....yep...the apprentice.....me :eek:
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    Homemade 555 Tachometer

    Take a look here...should be a bit of help http://www.sportdevices.com/rpm_readings/index.htm
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    Math Question, How Do You Really Figure This Out

    Do you have the data sheet? Possible you are going over tha max standard operating current. Try a 22R...I doubt you will see the light output difference anyhow.
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    LED Circuit Help.

    Firstly, what is the 9v battery type?
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    Help.. Modifying a circuit to eliminate 30 minute time out

    All garage doors I've seen do this already with the built-in light.
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    Easy Machine To Wind Transformer

    Scroll down to "Electronic test and projects creation".... 4 to pick from http://www.theprojectasylum.com/electronicsprojects.html
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    What's wrong with circuit?

    To me it seems the 33nF and the 4K7 are across the mains so first filter section, 2nd section is the 22nF and the 1K............ just as shown in the last attachment. I would imagine the other 22nF on the base is to block any DC component and just allow the signal to pass.
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    KJD 17 wiring to 230vac single cap motor question.

    M x 2 ..............such as this.......
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    What's wrong with circuit?

    I looked up this circuit section, called a 2nd order high pass filter, and found this equation.(pic below) Using the values I still only get around 2Khz.
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    Model Ship LED Project

    Yes, I did think about that afterwards but you jumped on it before I could correct it. Maybe this one should do...note you said you had access to the 5v as well.........
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