Recent content by ben23

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    Guitar pre-amplifier to amplify to line level

    would the KEMO #M40 pre-amplifier module be ok to amplify a guitar output to line level so i can play my guitar thru a normal amplifier when I dont have access to a proper guitar amp. here is the link for it...
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    Remote PC 'power up'

    yeah a transistor type of switch would be good but i too have no idea how to make one, a transistor switch is a solid state relay basically. rating wouldnt need to be anything high, as the start up current is only momentary and very small (<200mA)
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    AT PC power supply only putting out 10V between 12+ and GND

    yeah theres nuthing on the 5V rails, ill have to try that, i have a little 12v pilot light, ill measure the resistance and see if it will be ok, that way i can see if the PSU is on as well. there is an orange "power good" wire, should i ground that or power that or anything, maybe so the PSU...
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    Remote PC 'power up'

    ok first your going to need it to work like this phone rings - relay closes - computer starts up you hang up - relay opens - computer keeps on running to turn off phone rings - relay closes - computer begins to shut down (as long as you have configured the Power settings in Control Panel to do...
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    AT PC power supply only putting out 10V between 12+ and GND

    i have a old 220w computer psu, so old that its an AT, and was built in '94, im using it to power my 12w x 2 amp that usually is in my school bag with the speakers, but im sick of charging the battery all the time at home, so i rigged it up to this PSU, but i measured the voltage between 12v+...
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    3mm Jack Audio switcher

    i actually recommend a 3PDT, so that way you can switch the grounds and isolate the other inputs ground to avoid interference and/or ground loops.
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    Difference between rms and PMPO

    basically PMPO is bullshit RMS is what u should be looking at
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    Power car amp from PC PSU

    yeah i think ive just had bad luck with the PSU's, that 5+5+3.3 sounds pretty good actually, nice work Ante, cos that gives 13.3 like u said, but its not voltage that worries me, admittedly, it wasnt a 300w now i think of it, it was actually a small mini-ATX 80w power supply, with 2.7A on the...
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    Drawing power from a single live wire

    to put it simply, there needs to be a point of 0 volts i.e the neutral wire
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    Power car amp from PC PSU

    ok first of all, how much does the amplifier draw in amps (the fuse rating is a good indicator of what it is) or check how many watts the amp it is. then divide the wattage by 12, you will get the amperage draw (this would obviously be at maximum volume) second of all, once you have found that...
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    Im buildin a tachometer an...

    what about using a hall-effect device, that could work, the ones used in car ignition systems
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    building a generator

    yer that was my first idea but i dont want the added weight of a battery and inverter, rather just have the engine, induction motor (alternator) and capacitor bank and have it wired to a standard power point
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    Question: Can computer burn your house down?

    first of all, make sure of these few things - you have a quality power supply - your power cables are in good condition and are plugged in tight - you have a RCD = residual current device (safety switch) or a GFCI for americans whether it be at the switchboard of your house or as a plug adaptor...
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    using computer speaker amp for portable sound system

    now i know i have the system thats in my school bag (the 12w x2), but i need one thats smaller, i have a small amp pcb from a pair of multimedia speakers. it has the usual tone and vol control pots on it, but, its made to run on 12v AC from the mains transformer, but right after where the...
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    My 12 watt x2 stereo amplifier

    yeah i know what you mean, im not too fussed on SQ, it just has to relatively clear, not distorted and loud. Car speakers dont have a specific enclosure requirement, as they are usually mounted in car doors. i would use the box i have but the way i have built the bottom has been built around...
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