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yesterday i played this gig before murcof and i realised one terrible thing in my laptop - when i connected it to the mixer some terrible hum and squeek came through which i couldn't get rid off. the problem was solved taking out the power adapter but my battery would last max about 15 minutes. murcof himself told me i should buy a di-box. but the someone told me about something called "ferryt-filters" which are just some weird rings that you put on the cable of the power supply and it should work fine... anyone knows something about this ? |
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some info about the rings you talk of http://www.goaskalice.columbia.edu/2318.html teeth |
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If Murcof was a real friend, he'd have given you his di-box. |
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no generalnie zasilacz powinien miec na kablu, najlepiej przy samej wtyczce do laptopa okragly filter dookola tak jak |
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''Ball by ball, the testicles go through'' I didn't know you slid them over the testicles. I'm really uninformed when it comes to cock rings. |
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o kewl thanks i wondered on which cable i would have to place it. |
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yeah mine does it too. it usually helps to wiggle the wire round a little bit. then again my laptop cn last 4 hours without acnd thast much longer then anything ill ever do live. |
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it was really horrible - i hope i get rid of this soon because you could even hear my mouse moves in very silent moments. |
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sounds like a . this can happen, for example, if you're running connected electronics off two different AC circuits. |
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Those rings are ferrite rings. They are wrapped around the DC cable to power the laptop and work by eliminating AC components. The laptop has a small box which connects to the mains. Then the box has another cable which connects to the laptop. It is the cable that goes to the laptop which needs to be looped through the ferrite rings. If the mixer has a "ground lift" feature, you could try using that if the problem is with ground loops. |
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no ground loop option... so if i understand corectly i have to make a loop from the cable over the ferrite ring and not just clamp it on the cable? |
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depends on the type of ring. Some have hinges and clip over the cable, others are larger rings where you loop the cable through it as many times as you can. You can also modify your audio cables to lift the ground. For example you can paint over the ground contact on one end on each cable you use. Don't do it on both ends or the cable will be unsheilded. If you do it on one end, the cables are grounded on one end so the shielding works, but the ground connects through the AC ground connection only, not through the cables sheild as well. This way the loop is broken, but the signal levels still work because the 0V refererence level goes via the AC ground instead of the audio cable ground. This is effectively what a ground lift switch on a mixer does. BTW make sure you NEVER take out the AC ground connection or else you can die, its an essential safety feature. |
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will such a ferrit ring get rid a 100 % of the problem or would a direct box be the better (but about 50 times more expensive) solution |
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dunno. try the cheap one and if that doesn't work try the more expensive one! |
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I bloody hate hum, especially when I'm DIYing a synth and getting it from BATTERIES!!! |
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That's poor shielding then, or some other kind of pickup. That's not conducted interference (ground loops) but radiated (pickup), unless you are getting nasties coming up the audio cables, but that can be cured quite easily with the whole ground lift thing. Since you are into DIY, here is another tip.... If you ever make a diy phaser with light dependant resistors, make sure that it is properly contained in a box so no outside light gets on them or else your signal is modulated by the light bulbs in the room to give a 100Hz buzz. (100Hz cos light bulbs light on both halves of the 50Hz sinewave). |
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that's just good advice everyone should know. |
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do you think it would be difficult to make a di-box diy ? |
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Yeah, I think it was a bit of both to be honest, could've been amplifying my (already dead) signal too much = NOISE. I'd always put vactrols in a very very very darker than dark box anyway. Sadist: I would have thought it would be pretty easy. Depends if you want phantom power or not. |
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not to be a nitpicker, you seem knowledgable and im curious.. isn't it true that you only get interference from tube lights? the wire in regular light bulbs cools down too slowly, you can't see the sine wave that way. |
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Here is a little bit of a review for some DI boxes of various price range. This website is all round pretty good. |
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just to clear things up: i realised that the direct boxes convert a signal from a jack input to xlr. but what if i need to connect it to a mikser that has only chinch inputs? would soldering such a connection (xlr-chinch) work? |
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don't you just need a grounded plug |
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yeah but where to ground the audio interface? |
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yep. connecting laptop to the mains causes the buzz. the buzz is the 50hz AC mains. i dont know how to get rid of it, but i know how it happens. just get a better battery. or there must be some way you can filter out the buzz. dunno like innit |
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