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Old 12th January 2007, 09:40 PM   #1
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Default A. Holton AV400 power amplifier

Hello,

I'm going to make AV400 amplifier with self-routed PCB.

I want to decrease power supply voltage to about +-56VDC. How many watts I will have with +-56VDC. Does I need to change any values in schematics for lower voltage and what is the lower working voltage for AV400?

How many OP pairs I need with lower voltage? Or does it better to use 4 pairs anyway?

Does it legal to post a schematics (redraved by me) of AV400?
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Old 13th January 2007, 09:55 AM   #2
alex mm is offline alex mm  Romania
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....hallo , to bild this amplifier , 2 pair MOSFET in OP stage its enough , supplied with +/- 55V .Certainly , power output will decrease My first power amplifier using IRFP 240/IRFP 9240 supplied at rail voltage +/- 60 V here [IMG]Ampli3[/IMG]
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Old 13th January 2007, 10:36 AM   #3
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Hi Stanley

The AV400 will work just fine on 56 volts I would only use 2 x pairs of Mosfets that is all you would require at that supply voltage.
Power out into 8 Ohms will be around 120 watts or so and into 4 Ohms about 200. the later will depend on your supply regulation.

Post a way your schematic its OK....
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Old 13th January 2007, 11:47 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi The Saint,
are your schematics available on your web site? or elsewhere?
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regards Andrew T.
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Old 13th January 2007, 11:53 AM   #5
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Hi AndrewT

There are no schematics on my web site but the AV400 schematic is easy to find on the internet, just by Googling it

It's getting on a bit now I did the design on it back as far as 1994
when it appeared in Silicon Chip electronics magazine June Issue.
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Old 13th January 2007, 03:51 PM   #6
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Hello,
thanks for answers

Here is my modified schematics:
- added a pair of snubber MKT capacitors
- removed clipping detector
- fuses are on power supply board
- does it needed to add these networks to output with inductor and resistor in parallel and capacitor and resistor in series? And what values they must be?

In AV800 schematics there are 2 diodes with zenners in gate protection circuit, does it needed to put this diodes to AV400? And what is their purpose?

Schematics:
Poweramp.pdf

And PCB:
What you think about that way of routing OP part.
The PCB will be double sided. What you could suggest to change in that PCB?
Click the image to open in full size.
Attached Images
File Type: png op part pcb.png (96.5 KB, 2228 views)
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Old 13th January 2007, 03:55 PM   #7
Spirtos is offline Spirtos  Greece
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Hmm, something is going wrong with your schematic link, or not?????
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Old 13th January 2007, 04:01 PM   #8
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OK, if link above doesn't work, use this:
Attached Files
File Type: zip poweramp.zip (61.0 KB, 1384 views)
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Old 13th January 2007, 08:10 PM   #9
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One more question: with 2 output pairs how hot are Q6, Q7, Q8, Q9 in voltage amplification stage? Do I need to use heatsink?
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Old 13th January 2007, 08:38 PM   #10
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Hi Stanley

No you will not need a heatsink for those transistors.
However I have had a look at your schematic and I would change R7 from 120 to 100 ohms.
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