Hiraga "le monstre"

[neazoi]

sorry but I cannot register there, everything is in duch
Is there any way to answer the remaining questions please?

[JohanH]

sorry bout that

[neazoi]

Originally posted by JohanH
sorry bout that

YesI have got the complete original article but it is not in english that is why I am asking if I can use only batteries, plus the other questions.

[JohanH]

Then Yes you could,

But how would you ensure both batteries discharging at the same rate and thus avoiding DC offset?

[woody]

I used batterys for a low power son of zen amp and while it
sounded fine charging them was a pain. You might think about
building a 24v +&- supply and keep a 1/2A trickle charge going
all the time through rcrcrc filter.

[neazoi]

So you think it is better to try to translate the original article and try to use one of the authors approaches instead of trying the battery-only solution?

[neazoi]

Hiraga says:

Following the article in Issue 29, many readers have asked if, in the "Monster" verÂ*sion, the mains supply was used only to charge the two large 40 A/h batteries. In fact, two modes of use are possible. The batteries can be used as the only power supply source, but take heed, the endurance hardly exceeds a few hours, lead-acid batteries are sensitive to deep discharges and their lifespan depends on this, so 12.2V is a lower limit that, above all, should not be exceeded. The second mode, which is the one that which we most usually employ, consists of using the batteries only as a buffer, with the mains charging the power supply permanently. Of course, in this solution, the power supply noise rises considerably, by 30 to 40 dB. However, in spite of this, the Monster remains an amplifier without rival, even if it loses in "luminosity" compared to its operation on batteries and without a mains supply.



Does it mean I can use only batteries for power supply?
In this case do I need to connect parallel to the batteries the big and smaller capacitors or just the batteries should be sound perfect?

[danieljw]

Neazoi,

Perhaps look at it this way,

you will need something to charge the batteries correct ?

if yes then why not build the supply with capacitors to charge the batteries and then you can use it in both "modes"

- if you have two 80AH lead acid batteries then you are half way there.

have you seen the pictures of the completed (original) amplifier ?

-Dan

[neazoi]

yes I have seen them. the third configuration seems to be the best. http://neazoi.com/page/audio/monstre/monstre.htm

I am thinking of using his configuration, but the question is, in battery only mode, do I need the capacitors after the pi-filter or the batteries themselves are sufficient?
(I consider the power that will be instantaneously drawn by the amplifier in sharp music volumes. capacitors can provide full instantaneous power)

[Lumba Ogir]

neazoi,
are you seriously considering battery supply?
Battery supply greatly enhances the "luminosity" of any amplifier. The capacitor bank is still necessary for providing adequate signal ground.