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  1. R

    2 different input AC voltage in a transformer

    ok, so we're familiar with a transformer where the AC primary winding induces a magnetic flux in the transformer core which in turn creates a  voltage difference and current in the secondary winding. now, i realize this may be a VERY dumb question, but what if we have 2 different AC voltages...
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    Measuring low current on high voltages?

    so i have this electric device that can generate about hundreds of kV of electricity, but low currents. i'd say about tens of milliamperes?? i only need to measure the current. i was thinking of simply using my digital multimeter, so sure, my multimeter can take it coz it's rated to go up until...
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    redirecting 3.5mm jack input

    since i still don't have my PC back (thought i am very, very very, very anxiously looking forward to getting it back ASAP), i play my MP3 music from my cheap cellphone. i also happen to have this alarm radio that's got a big speaker. it's got no audio input jack, though. now basically, i want...
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    gas ignitor for kVs of spark

    i want to create electric sparks that can travel through the air of a gap of about 0.5", so i need about 15kV. it only needs to last for about a second or two. i've considered flyback transformers, car ignition systems and neon sign transformers, all 3 are a tad too expensive for the budget...
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    high voltage electric arc

    i need to create voltaic sparks that jumps from one electrode to another between a medium of air. sort of like jacob's ladder. the distance of one electrode to another is about 0.5". i gather that the breakdown voltage of air for said distance is about 4kV. i'm targeting more of around 20-30kV...
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    computer speakers

    i've been wanting to buy new high quality computer speakers for some time now, but as cheap as i am, i'm unwilling to go further than $25. purchasing used ones are a no-no for now. so i was wondering if it is a practical option to actually just swap the amplifier inside my old speaker enclosure...
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