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Old 8th April 2003, 04:20 PM   #1
Ford_V6 is offline Ford_V6  Romania
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Default What about this amp design ?

What about this one ?
Did someone built this ?
Some impresions about it ?
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Old 8th April 2003, 05:18 PM   #2
Freddie is offline Freddie  Sweden
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Cool HPPA

I've built this amplifier about 4 years ago. A friend of mine still uses this amp. It's sounds pretty good, but I haven't compared it to my new amps.

The amplifier is called HPPA (High Performance Power Amplifier) and it's designed by Bert Molenkamp in the Netherlands.

One thing I do remember about this amp was that it was pretty hard to get the bias stable. You MUST use a 5mm or thicker U- profile to mount the six output transistors and use a large heatsink. A temperature controlled fan is also recommended.

Bert also recommended the MJ3281A/MJ1302A instead of MJ1500x transistor. And MJH6284/6287 instead of the TIP142/147 darlingtons. But I used the transistors in specified in the schematic.

The BD791/792 might be hard to get, but you can use BD139/BD140 instead. Those four transistors must be placed on the same heatsink.

/Freddie
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Old 8th April 2003, 06:42 PM   #3
Ford_V6 is offline Ford_V6  Romania
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Does anybody here have a working PCB for this baby ?
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Old 10th April 2003, 09:29 PM   #4
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I noticed in the design the long-tailed pair uses an adjustable current mirror instead of a simple adjustable current source - what is the advantage in doing so??
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Old 12th April 2003, 02:55 PM   #5
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Quote:
Originally posted by Ford_V6
Does anybody here have a working PCB for this baby ?

I made a couple of these amps some years ago and I must say they were quite good indeed.
I have a PCB layout in BMP format (200 dpi) only, components placement has to be "hand-made".
Driver transistors are mounted on the main heatsink as well as the BD139 which sets the bias current.

Cheers

Andrea
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Old 12th April 2003, 02:56 PM   #6
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Damn attachment method.... here it is
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Old 13th April 2003, 07:12 AM   #7
Ford_V6 is offline Ford_V6  Romania
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thanks great
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Old 24th April 2003, 09:03 AM   #8
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Let me know how it works if you build it..

Cheers

Andrea
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Old 24th April 2003, 07:16 PM   #9
Ford_V6 is offline Ford_V6  Romania
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If i decide to built'it i will post the results here !
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Old 1st July 2004, 11:48 PM   #10
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Default Re: What about this amp design ?

Quote:
Originally posted by Ford_V6
What about this one ?
Did someone built this ?
Some impresions about it ?

Question... why have 2 BD792? It seems the first one is to be saturated so why the other?

try using 2 rectifier diodes instead of the 39Ohm resistor. It would be safer.

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