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First One - mosFET amplifier module

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#1,447
Hello all, total newbie so I'm a bit confused. I want to put together 3 of these amps for my front left/right and center speakers. They are just simple two-way 1"/6" and I live in an apartment so I won't be playing it very loud and there is not a lot of low frequency being generated. Needless to say, I won't be pushing these amps too hard. For the power supply, I really wanted to drive the three amps off a single PS, probably a Hypex. I read through nearly this whole thread, and think I understand the benefits/negatives of the single PS, but I cannot figure out the sizing if I go this route. Looking for recommendations, would you go with the 400, 1200, or 3k version of the A400 unit? Also, would you use the soft start board?
Thank you so much
 
#1,449
sonicman said:
Hello all, total newbie so I'm a bit confused. I want to put together 3 of these amps for my front left/right and center speakers. They are just simple two-way 1"/6" and I live in an apartment so I won't be playing it very loud and there is not a lot of low frequency being generated. Needless to say, I won't be pushing these amps too hard. For the power supply, I really wanted to drive the three amps off a single PS, probably a Hypex. I read through nearly this whole thread, and think I understand the benefits/negatives of the single PS, but I cannot figure out the sizing if I go this route. Looking for recommendations, would you go with the 400, 1200, or 3k version of the A400 unit? Also, would you use the soft start board?
Thank you so much
Click to expand...


You can go with 1 single hypex SMPS1200A400, soft start is not needed with this SMPS.

Of course separate PS (3x SMPS1200A400) is better 🙂
 
#1,450
Sonicman, I have planned to power four modules from one smps1200 for my build. So far in the builds shown the most modules powered from a single power supply is two.

The only issue will be whether the SMPS will start up with more modules attached due to the fairly large bias current (280mA per module). Some other SMPS's have had trouble starting with these bias currents.

I will hopefully test this out in the next couple of weeks and can report success or failure with four modules. All of the Hypex SMPS's have a built in soft start facility so there is no need for a separate board.
 
#1,451
fluid said:
Sonicman, I have planned to power four modules from one smps1200 for my build. So far in the builds shown the most modules powered from a single power supply is two.

The only issue will be whether the SMPS will start up with more modules attached due to the fairly large bias current (280mA per module). Some other SMPS's have had trouble starting with these bias currents.

I will hopefully test this out in the next couple of weeks and can report success or failure with four modules. All of the Hypex SMPS's have a built in soft start facility so there is no need for a separate board.
Click to expand...

My SMPS can face 10A at start up without problems,

http://i39.servimg.com/u/f39/19/01/03/77/2014-012.jpg

Good luck
 
#1,453
Thank you all for the feedback on the multi-channel solution with single PS. I'm not qualified to test the electronics (my background is acoustics), but I'm happy to buy and try and tell you if it blows up or not ;-)
I ordered the 3k version just to have the headroom.


Cresnet said:
My SMPS can face 10A at start up without problems,

http://i39.servimg.com/u/f39/19/01/03/77/2014-012.jpg

Good luck
Click to expand...
 
#1,456
Merci Do ( deux paires ) , je l'avais lu , mais après plusieurs autres pages ça m'a sortie de l'esprit .... quand même 100 watts par paire , il doit être ( le bias ) très près du class B ........... ça avance pour ton évaluation ?
Babylon translation ;
Thank You Do , i had read , but after several other pages it's told me out of my head .... with even 100 watts per pair , it must be ( the bias ) very near the class B ........... your evaluation .... soon ?

LC

It is feasible to have a module with bias in Class A?

Thank
 
#1,458
4mc2 said:
with even 100 watts per pair , it must be ( the bias ) very near the class B ........... your evaluation .... soon ?
It is feasible to have a module with bias in Class A?
Click to expand...
4mc2, do you feel ~150mA/pair "very near the class B" (if i'm not wrong about the FO)?
With decent efficient enclosures, you'll be in Class A for most of the musical program at good listening levels. Who want to spend more watts for transients so fast that you'll never notice any distortion witch will be, anyway, under your listening thereshold ?
This said, nothing (but cooler size) impeach-you to increase the quiescent current if you like. It will not even change the quiescent of the VAS.
You can have a look to the VSSA (80W/8Ohms) too.
 
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