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Old 13th December 2002, 10:06 AM   #1
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Default Elektor PA 300 amplifier

Have anybody built this amplifier from Elektor magazine. It was published in November 1995.

I am interesting in his sonic and building capabilities!

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Old 13th December 2002, 04:43 PM   #2
OliverD is offline OliverD  Germany
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I've built several of theese. They are derived from something like a PA-600 originally published in Elrad many years ago. It's an easily scalable concept.

I made my own PCB layout and replaced the complete protection circuit. Due to the simplicity of the circuit, they are reliable and easy to build.

They exactly sound the way you would expect a "opamp input stage high feedback bipolar amplifier" to sound: somewhat compressed, a bit cold... IMHO, they are ok for PA use, especially for the low frequency range in active setups. Keeping big woofers under control is their strength.

If you need an amp for your band or party room, there you go. Use a bigger transformer and add some big caps in the power supply, though.

However, if you need an amp for your high end system, check the PassLabs designs.

Best regards, Oliver
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Old 13th December 2002, 05:03 PM   #3
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Default Schematic

Could you send a schematics to this forum, this will be great. I have built a 50W current nfb IGBT amp ( replace IGBT by Hex Fets ). I had a lot of problems with it: cannot find a parts which pass to pcb, and a discription isn't good. I think T.Giesberts projects are too complicated, but if you like parameters ( thd < 0,0000....% ) those amps are very good.
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Old 13th December 2002, 08:07 PM   #4
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Thanks for information!!!

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Old 12th February 2008, 08:01 PM   #5
weg is offline weg  Switzerland
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Default PA600 OliverD

I'm consider to build a amplifier PA600 from OliverD. Has some one an PCB-Layout?
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Old 12th February 2008, 08:19 PM   #6
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Default Hi!

This is what I, have .

I'll send you by Email. Sign.

Regards zeoN_Rider
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File Type: jpg pa300-1.jpg (49.4 KB, 1645 views)
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Old 12th February 2008, 08:57 PM   #7
Nordic is offline Nordic  South Africa
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Sorry was thinking of Studio 350 in EPE.
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Old 13th February 2008, 03:38 PM   #8
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I've got the whole PA-300 article, 1.7MB/pdf - but not in english, sorry. Schematic, PCB, placing, measurements are included.
Anyone who is interested let's throw me a mail and then I send you the article.
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Old 13th February 2008, 04:14 PM   #9
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Why spend good money on building old junk amps if there are contemporary and decent designs with a proper pre-driver stage ?
The PA300 design is both old and junk.
An example and a free present, from ampy enthousiast Jan Dupont, Lynx-3 : here
A veces la Moral y la Ley no están de Acuerdo. Si No, se puede esperar a mi llegada, el placer es todo mío.
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Old 13th February 2008, 04:38 PM   #10
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Hello Supernet,
I have built about 10 modules based on the Elektor circuit pa300
using MJ15003/4 they sound good and are reliable. I also use them in the amps i hire out and i get good comments from clients who hire them. One word of caution when using the ne5534
op amp you must connect a 47pf cap fron pin 6 to pin 2 of the op
amp or the module will oscillate. I am busy building the pa 600 at the moment and will post circuit and pictures as soon as i'm
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