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zobel network and cat5
zobel network and cat5
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Old 17th January 2007, 10:12 AM   #1
reddish75 is offline reddish75  United Kingdom
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Default zobel network and cat5

ive just made cat5 speaker cable, bit my amp is running hot, ive heard that a zobel network would remedy this. but im only a beginner at this and have no idea of how to build, implement, or work out the values for such a thing.

can anyone help?
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Old 17th January 2007, 10:37 AM   #2
Igla is offline Igla  Slovenia
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Old 17th January 2007, 10:40 AM   #3
AndrewT is online now AndrewT  Scotland
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Hi,
help us identify your overheating problem.

Tell/show us the schematic. Particularly the driver and output stage & NFB loop/s.
How long are the speaker cables?
How did you assemble them?
How many pairs are you using?

A CAT5 cable using multiple pairs in close proximity may have significantly more capacitance (from supply to return) than a more normal spaced pair (figure of eight).

This, possible extra capacitance, could cause the amplifier to oscillate if it is badly designed and/or assembled.
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Old 17th January 2007, 12:29 PM   #4
SY is offline SY  United States
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zobel network and cat5
I'm moving this thread to a more appropriate area where you're more likely to get it read.
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Old 17th January 2007, 07:18 PM   #5
reddish75 is offline reddish75  United Kingdom
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i folloewd the twisted pair design on tnt audio, the cables are about 5m long, as far as schematics for the amp go (cambridge a300) hopfully ill have them quite soon
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Old 17th January 2007, 10:31 PM   #6
halo0925 is offline halo0925  United States
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Default zobel and cat5

The a300 should already have a standard value zobel inplace, its an AB amp and should not run to hot. The best thing to do is check the output with a scope and signal generator that way you can pin point capacitive reactance at specific frequencys, then you can fine toon the zobel.
Ditch the cat5 cable its designed to carry 100 to 300mhz digital signals and has inherently high capacitance.
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