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supernet 13th December 2002 10:06 AM

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!


OliverD 13th December 2002 04:43 PM

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

hugonot 13th December 2002 05:03 PM

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.

supernet 13th December 2002 08:07 PM

Thanks for information!!!


weg 12th February 2008 08:01 PM

PA600 OliverD
I'm consider to build a amplifier PA600 from OliverD. Has some one an PCB-Layout?

stoN_Cold 12th February 2008 08:19 PM

2 Attachment(s)
This is what I, have .

I'll send you by Email. Sign.

Regards zeoN_Rider

Nordic 12th February 2008 08:57 PM

Sorry was thinking of Studio 350 in EPE.

Andy L. Francis 13th February 2008 03:38 PM

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.

jacco vermeulen 13th February 2008 04:14 PM

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

Bruce@bluff 13th February 2008 04:38 PM

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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