luggsey Posted October 1, 2007 Posted October 1, 2007 here we go again ok, if you decouple an audio amplifier pre stage you fit a small resistor, then say a 10 - 100uf a cap after it, both are close to and before the input supply to the pre-amp, this is done even on a short legnth of wire or instability may occur. a 50 pf cap across the supply will act as a hi pass (or shunt) to high frequency 'buzzing' on the audio. in this CAT5e situation, the 'small' resistor is the cable due to it's length, it will also (due to it's inherent capacitance) cause back EMF when power is initially applied, but given the suggested length of 200 meters the current passed into a 'flat' resovior cap will be limited by this cable resistance and coupled with the back emf will also act to reduce the current drawn. even doubling/trebling up will not give capacitance for our needs, a 100 pair cable would not eather, when charging MICC you haver a thick copper sleeve and thick cables to act as plates and a descent air gap, thats why you can charge up a length of it and watch when a numty touches the open ends, scream's at the sparks and then is shown it's not connected to antything and head is scratched . regs alan in operation LOL! It took you long enough to answer! Where did you get this tosh from? Who mentioned audio? What are you on? (Red watery stuff?) Explain how you "de-couple" from a supply to a camera? This is bollox Alan! Back EMF in a length of CAT5, come off it, no magnetic field collapse there matey. Oh and no airspace in a MI cable, just magnesium oxide. You have had too much or not enough, I can't work out which, but I look foward to you next ramble like a dose of the pox! ----------------------------------------------------------------------------------------------------------------------------------- Life is like a box of chocolates, some bugger always gets the nice ones! My Amateur Radio Forum
arfur mo Posted October 2, 2007 Posted October 2, 2007 LOL! It took you long enough to answer! sorry, but well id sleep on occasions Where did you get this tosh from? Who mentioned audio? i did as a working example for the subsequent explanation What are you on? (Red watery stuff?) OVALTINE from a rusty tin can - well documented in here for those who read Explain how you "de-couple" from a supply to a camera? This is bollox Alan! the working example did just that Back EMF in a length of CAT5, come off it, no magnetic field collapse there matey. if you pass a current along any legnth of cable a small back emf will be experienced proportionate to the energy dissipated, it will alsi introduce a current in an adjacet wire, if it did'nt trans formers and capacitors would never have come into existence. Oh and no airspace in a MI cable, just magnesium oxide. no matter the non conducting merial which is used, it is as with electrolytic capacitors. a capacitor is formed by to conductors in close proximity, the eefficiency is a product of the materials used and the size of the plates. You have had too much or not enough, I can't work out which, but I look foward to you next ramble like a dose of the pox! i'd suggest you 'try before you buy', up to you then if you don't agree. ramble completed regs alan If you think education is difficult, try being stupid!!!!
luggsey Posted October 2, 2007 Posted October 2, 2007 i'd suggest you 'try before you buy', up to you then if you don't agree.ramble completed regs alan Short ramble for a change? ----------------------------------------------------------------------------------------------------------------------------------- Life is like a box of chocolates, some bugger always gets the nice ones! My Amateur Radio Forum
digitaleye Posted October 8, 2007 Author Posted October 8, 2007 Thanks chaps, I think. Didn't mean to start a fight. I think I'll try & run a spur local to the camera, after reading all this it seems the simplest way.
alterEGO Posted October 8, 2007 Posted October 8, 2007 Thanks chaps, I think.Didn't mean to start a fight. I think I'll try & run a spur local to the camera, after reading all this it seems the simplest way. lol handbags at dawn again That is the best way to do it mate, cuts out any problems.
luggsey Posted October 8, 2007 Posted October 8, 2007 lol handbags at dawn again That is the best way to do it mate, cuts out any problems. Oh I say! I must stop winding up Alan, he does go on and on and........ Agree that a local PSU is always best. ----------------------------------------------------------------------------------------------------------------------------------- Life is like a box of chocolates, some bugger always gets the nice ones! My Amateur Radio Forum
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