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Old 17th January 2007, 09:12 AM   #1
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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, 09:37 AM   #2
Igla is offline Igla  Slovenia
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Old 17th January 2007, 09:40 AM   #3
AndrewT is offline AndrewT  Scotland
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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.
regards Andrew T.
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Old 17th January 2007, 11:29 AM   #4
SY is offline SY  United States
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I'm moving this thread to a more appropriate area where you're more likely to get it read.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 17th January 2007, 06:18 PM   #5
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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, 09:31 PM   #6
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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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