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Old 18th March 2009, 05:50 AM   #241
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i am unsure what you mean by less clean ?

as in noise or aesthetics or topology ?

the amount of caps is probably overkill but both amps have relatively low PSRR so they dont hurt.

-Dan
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Old 18th March 2009, 05:55 AM   #242
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Speaking of caps wouldn't those 1F or larger caps intended to
be used for large car audio amps be good for this aplication.
By the way anyone have a cheap set of boards for this amp?
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Old 18th March 2009, 06:05 AM   #243
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Dan,
the two 68pF and 2200pF caps are very deteriorating.
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Old 18th March 2009, 07:30 AM   #244
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danieljw, thanks for the post, very informative.
That is what I was thought, to try the amplifier with batteries only first, as two 80AH batteries will last more. It is also a bit cheaper than aqcuiring these big caps.

I think the biggest problem with batteries is the voltage variations as the battery discharges, which will affect the bias setting, so one should continuously set the bias or should use the battery for less time before it descharges completely and have a voltage drop. Of course in such configurations only deep cycle batteries should be used.

Also voltage and amp meters must be used to contonuously monitor the voltage and the amp drawn. Since the PSU will be in another box changing the configurations won't be a problem.

I will let you know about the results, but I feel that appart from the time restriction factor of the batteries it won't dissapoint, as it is clean and straight forward. Anyway five hours a day continuously is very fine to me
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Old 18th March 2009, 10:59 AM   #245
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Quote:
Originally posted by woody
Speaking of caps wouldn't those 1F or larger caps intended to
be used for large car audio amps be good for this aplication.
By the way anyone have a cheap set of boards for this amp?
That sounds like a really good idea.

Quote:
Originally posted by Lumba Ogir
Dan,
the two 68pF and 2200pF caps are very deteriorating.
do you mean they are deteriorating in terms of the sound or the high freq roll off... ??

Quote:
Originally posted by neazoi
danieljw, thanks for the post, very informative.
That is what I was thought, to try the amplifier with batteries only first, as two 80AH batteries will last more. It is also a bit cheaper than aqcuiring these big caps.

I think the biggest problem with batteries is the voltage variations as the battery discharges, which will affect the bias setting, so one should continuously set the bias or should use the battery for less time before it descharges completely and have a voltage drop. Of course in such configurations only deep cycle batteries should be used.

Also voltage and amp meters must be used to contonuously monitor the voltage and the amp drawn. Since the PSU will be in another box changing the configurations won't be a problem.

I will let you know about the results, but I feel that appart from the time restriction factor of the batteries it won't dissapoint, as it is clean and straight forward. Anyway five hours a day continuously is very fine to me
Yeah that is a good point Neazoi, 5 hours is pretty good. oh by the way are you planning to make a run of boards?

-Dan
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Old 18th March 2009, 11:03 AM   #246
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Yes I do, in the next days/weeks I will make my set. I can make an extra set if you like but do not expect epoxy covered proffessional PCBs. These are all home made, although they are good printed quality.
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Old 18th March 2009, 12:33 PM   #247
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Quote:
Originally posted by neazoi
Yes I do, in the next days/weeks I will make my set. I can make an extra set if you like but do not expect epoxy covered proffessional PCBs. These are all home made, although they are good printed quality.
I'm very interested in the result and a set of boards too ofcoarse.
I saw you mod on the trimmer..nice!

Kees

(i feel quite flattered that this design is really coming to life )
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Old 18th March 2009, 12:37 PM   #248
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I can make another pair too, no problem.

I do not see anything unusual with your PCBs, the same star GND as the original Hiragas PCBs but with a more modern tone. So I am going to go for them.

In such small PCBs you do not have long paths of GND so I believe a star topology wouldn't be necessary either way

One last thing, I am thinking of replacing the bias resistor on the base of the drivers with another trimmer, to easily adjust the bias for voltage differences in the battery, when discharged. I am not sure about the sound effect so this is a thought yet. but if I decide this I have to adapt the pcb accordingly.
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Old 18th March 2009, 02:49 PM   #249
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I just thought a possible configuration for the PSU section.
Attached Images
File Type: gif psu.gif (7.9 KB, 586 views)
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Old 18th March 2009, 11:36 PM   #250
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Quote:
Originally posted by neazoi
Yes I do, in the next days/weeks I will make my set. I can make an extra set if you like but do not expect epoxy covered proffessional PCBs. These are all home made, although they are good printed quality.
Yes i am interested in the boards as long as they are not expensive...

Quote:
Originally posted by neazoi
I just thought a possible configuration for the PSU section.

good idea...

looks like some more monsters are on the way
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