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Got a quick question. I want to hook up my record player to my computer's standard soundcard. What to do with the 'earth' fromthe recordplayer? Is it nessasary to put a mixer in between? |
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tape the grounding wire to a big ass piece of metal, like a metal table leg or metal shelf or to a connect it to a screw hehe if you can't hear any 50Hz hum or weird noise, then you're ok |
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The output from a record player is usually phono, not line. Line levels are quite high levels and have a flat frequency response. Phono levels are much lower and use the RIAA curve for the frequency response. This means the bass is attenuated and treble accentuated. If your record player output is phono, you need a phono to line preamp, such as that found in a mixer. The actual circuit for the preamp is quite simple and you could make your own if so inclined. quick googling yields: http://sound.westhost.com/project06.htm The earth cable from the turntable needs to connect to the chassis of the computer or some other place where you have a low resistance path to earth, such as an exposed metal part of a radiator. Just connecting to a "big ass piece of metal" won't necessarily work. You're trying to keep the ground potential of all your equipment at 0 volts potential. This is done by referencing them all to your earth connection (a big bit of metal buried in the ground under your house). Typical things which are earthed are radiators, metal chassis on equipment, plumbing, etc. Synopsis: Is turntable output phono or line? If line, connect to soundcard, connect earth to exposed metal on computer or appropriate metal nearby. If phono, buy/make a phono RIAA preamp (or mixer), which will include appropriate connections for earth. This then connects to computer. HTH |
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dave_g throws some mad knowledge, yo. respect! |
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Omg what a enormous explanation! Tnx dave_g !! But I've got a new question. How can I figure out if it's line or phono? |
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I think it will be a phono output. It's rare for the outputs to be line level. You can try connecting to your line in. If the sound is very quiet and has no bass it is phono. * The other trick you could try is putting it into line in, playing a record and listening. Then power off the turntable (unplug it from the wall and wait a minute) then placing the needle on the record, spin it with your hand. Listen to a few seconds worth when it's being manually spun at roughly the same speed as before. If there was a built in phono preamp, turning off the power would disable it (the amplifier needs a power source to amplify) If you have no preamp, you still hear roughly the same sound. This is because the cartridge has a magnet and a coil linked to the stylus. As the stylus moves, it generates a small electric current in the coil (similar to a simple electric motor). Since the stylus only moves a TINY amount, you get a very small signal out of the turntable, hence the need for a preamp to amplify it. Most turntable outputs are just wires connecting to the cartridge, so even without power, you can still do it by hand! Because the signal is so tiny, you need a preamp to boost it to normal "line" levels. * the reason there is no bass is that the "RIAA curve" reduces the bass when cutting the record, so playback needs to recompensate by amplifying the bass and reducing the treble. This RIAA curve is used to stop the stylus from skipping. When you have a bass (low frequency) on the vinyl, the stylus has a larger deviation from the centre of the groove, which is much more likely to skip than a treble (high frequency) where the deviation is much smaller. If you watch a record being played (try some old school jungle) the deep bass is slow wide movements and treble gives fast short stylus movements. You can also see that for a greater deviation (bass) you also need wider grooves, which reduce the amount of music you can fit on a record. |
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interesting! thanks for the info, dave. |
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tnx dave..I'm pretty sure now i've got phono. FGonna save me up some money to bue a pre-amp. |
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