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Old 13th September 2008, 09:07 AM   #11
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Default Re: Re: My first Chipamp

Quote:
Originally posted by Peter Daniel
Rz and Cz are Zoble parts and I personally don't recommend using them
Why is that?
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Old 14th September 2008, 08:29 PM   #12
lineup is offline lineup  Sweden
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I would recommend using them.
Why?

Answer:
1. Because some loudspeakers will REALLY need them.
Some speakers would fool you that Zobel is not needed.
Next time your amplifier will make one Burn Out in Smoke, of your new set of LoudSpeakers
Would you really like this?

2. Because they are recommended by those making these Amplifier Chips!

3. Because the designers should know better than anyone, what is safe use of LM3875 & LM3886.

4. Because some AudioPhiles are not very smart .. at least compared by
National Semiconductor worldwide big, big company Technical Engineers staff
.. and neither am I, Lineup

5. But I am actually smart enough to give people some good advice
.. to prevent unnecessary DISSASTER


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Old 15th September 2008, 07:26 AM   #13
sangram is offline sangram  India
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I never put a Zobel on the amps I build for myself.

When I'm making for someone else, I always put them in.
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Old 17th September 2008, 08:55 PM   #14
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what does the zobel actually do? just makes the amp see a constant impedance?
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Old 18th September 2008, 04:45 AM   #15
sangram is offline sangram  India
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The zobel basically provides a low impedance path at high frequencies to counter the effects of cable and track inductance, and damp any high frequency oscillation.

http://en.wikipedia.org/wiki/Boucherot_cell

At an amp output, it should be called Boucherot cell, its function here is slightly different from a Zobel, which is used in passive crossovers. The terms are used interchangeably.

For short cable runs it may not be needed.
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Old 6th November 2008, 11:47 PM   #16
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thanks for the clarification

i finally have acquired all of parts i need. now i just need to build a case to keep it in. i was thinking about using a big Al heatsink for the front and making the rest out of mirrored acrylic. would this cause any issues with grounding? i have seen many cases made out of wood and metal, but only a few with any acrylic on them.
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Old 7th November 2008, 11:08 AM   #17
AndrewT is offline AndrewT  Scotland
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what are the rules on Safety Earth in the US or North America?

In the UK with the Acrylic case as an insulator you will have to ensure all the external conductive parts are permanently connected back to the Safety Earth.
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Old 7th November 2008, 12:49 PM   #18
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so if i grounded the heatsink, the only external metal part, it would be legal in the uk? makes sense from a safety stand point. also what size fuse should i use? i have some 3A and 5A slow blow fuses on hand, will i be able to make use of these?
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Old 7th November 2008, 01:25 PM   #19
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by Trooper46
so if i grounded the heatsink, the only external metal part, it would be legal in the uk?
But, how do the signals get in and out? How do you adjust the volume?
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