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Old 1st July 2007, 11:09 PM   #1
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Default Looking for 100wpc 8ohm mosfet based PCB

I'm looking for a nice Class A mosfet based amp that will do 100wpc at 8ohms. I'd like it to be a PCB that is available somewhere that I can buy right now. Any idea's? Right now the speakers are Klipsch Reference but eventually it will be large 3 ways using RS driver most likely.
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Old 1st July 2007, 11:20 PM   #2
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Hi,
The chances of finding a 100W ClassA PCB is near nil.
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Old 1st July 2007, 11:20 PM   #3
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If you really don't know: the A75 design by Mr Pass and Mr Thagard.
You can download the two parts of the A75 building manual from Mr P., order the A75 main board from AudioXpress.
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Old 1st July 2007, 11:25 PM   #4
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Well 60 wpc at 8ohms would be enough. And over 100 at 4ohms would be nice.
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Old 2nd July 2007, 04:27 AM   #5
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Is there a BOM for the Aleph 5 somewhere? I've searched and can't find it. I'm thinking of ordering the boards from chipamp.com and building a pair of Aleph 5's.
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Old 2nd July 2007, 07:33 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
ClassA output power is limited by the level of ClassA current available.

If you have a 60W into 8ohm ClassA output and instead connect a 4ohm load the maximum ClassA output drops to 30W.
Use P=I^2*Rload instead of the usual P=V^2/Rload to see the effect of a load change.
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Old 2nd July 2007, 01:24 PM   #7
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GB300D (mono)

Bare PCB US$60 + $4 p&p

Full module kit US$135 + $8 p&p

Built/tested module US$200 + $12 p&p
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Old 2nd July 2007, 02:25 PM   #8
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Good one, Dennis.

Dougie,
you can still use IRFP9140s for the full Class A version of the GB300D.
No idea how the Class A version of the 300 sounds, i haven't read of someone constructing one yet, the GB150D in 50 watt A i assembled is excellent value for money and really fast to put together.
Ordering the IRFP9140 is apac on your end.
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