Anyone with 4W class-A?

Jay · 8th May 2004, 04:26 PM

I need a small wattage class-A transistor amplifier (even 3W will do). Anyone has the schematic to share?

fcel · 8th May 2004, 04:34 PM

Isn't the oiriginal Pass DIY Zen class A amp 5W/ch? Do you have to have 4W or 3W?

Raka · 8th May 2004, 04:39 PM

You can always use an AB polarized for 4W in output class A and the rest in AB. Is not much too heat, and you'll use it most of the time with A, and a respectable headroom.

Fuling · 8th May 2004, 05:21 PM

Downsizing a Zen or any other Pass project should be a breeze.
I have a pair of Mini a monoblocks that doesn´t give more than maybe 5 or 6 watts, a friend offered me some hard cash for them after he had heard them in his system

Jay · 8th May 2004, 06:04 PM

Quote:

Originally posted by Raka
You can always use an AB polarized for 4W in output class A and the rest in AB. Is not much too heat, and you'll use it most of the time with A, and a respectable headroom.

The big heatsink problem dissappeared but the big transformer stayed

And may be it will break the small speaker I'm thinking to use.

So now you know why I want 4W. I have lived with 2.5W and I just wanted more.

The Zen seems to use big heatsink, but I will look again.

Hey Fuling, would you share the schematic?

till · 8th May 2004, 06:07 PM

For 4W Zen heatsink would not be too big, and for Zen lite most heat is in the lightbulbs so you could even use smaller heatsinks for transistor.

http://www.passdiy.com/projects/zenlite1.htm

millwood · 8th May 2004, 06:15 PM

you can always use a jlh for that. maybe at lower voltage.

If that's too complicated, you can always use a SE amp for that but it may dissipate more heat.

Fuling · 8th May 2004, 07:48 PM

Quote:

Hey Fuling, would you share the schematic?

I don´t have it at hand, but I guess it ca be found at several places here at the forum.
I use IRFP460´s and 2x10V 50VA transformers simply because that was what I had at home.

Bricolo · 8th May 2004, 08:12 PM

Quote:

Originally posted by millwood
you can always use a jlh for that. maybe at lower voltage.

If that's too complicated, you can always use a SE amp for that but it may dissipate more heat.

what's the efficiency of the jlh?

woody · 8th May 2004, 09:38 PM

I built the Son Of Zen with + and _ 12v rails (well a set of 12 v batterys) and with my speakers that didn`t need a high damping
factor it sounded marvious. Thanks again Mr. Pass.

Woody

8th May 2004, 04:26 PM	#1
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Anyone with 4W class-A? I need a small wattage class-A transistor amplifier (even 3W will do). Anyone has the schematic to share?

8th May 2004, 04:39 PM	#3
Raka diyAudio Member Join Date: Aug 2002 Location: Close to Oistrakh	You can always use an AB polarized for 4W in output class A and the rest in AB. Is not much too heat, and you'll use it most of the time with A, and a respectable headroom. __________________ What is beyond the speaker?

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8th May 2004, 04:34 PM	#2
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	Isn't the oiriginal Pass DIY Zen class A amp 5W/ch? Do you have to have 4W or 3W?

8th May 2004, 05:21 PM	#4
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	Downsizing a Zen or any other Pass project should be a breeze. I have a pair of Mini a monoblocks that doesn´t give more than maybe 5 or 6 watts, a friend offered me some hard cash for them after he had heard them in his system

8th May 2004, 06:07 PM	#6
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	For 4W Zen heatsink would not be too big, and for Zen lite most heat is in the lightbulbs so you could even use smaller heatsinks for transistor. http://www.passdiy.com/projects/zenlite1.htm

8th May 2004, 06:15 PM	#7
millwood Account Disabled Join Date: Apr 2003 Location: US	you can always use a jlh for that. maybe at lower voltage. If that's too complicated, you can always use a SE amp for that but it may dissipate more heat.

8th May 2004, 09:38 PM	#10
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	I built the Son Of Zen with + and _ 12v rails (well a set of 12 v batterys) and with my speakers that didn`t need a high damping factor it sounded marvious. Thanks again Mr. Pass. Woody

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