GX400 - 400W Audio Amplifier - Made in Romania - diyAudio
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Old 23rd June 2014, 05:39 PM   #1
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Default GX400 - 400W Audio Amplifier - Made in Romania

Last revision GX400 amplifier is the result of a process of improvement and testing of an amplifier schematic who was wanted in the first to be a simple and compact amplifier, easy to build and with electronic components easy to find. I started polished schematic of the amplifier to be much better than revision no.1.

It is an audio amplifier that I tested with many types of transistors, including doublet and triplet in the output. As kind Dynacord companies chose to go with transistor amplifiers input its seemingly trivial (since the '80s), see famous series 2N3904/2N3906, I decided at some point, after I test amplifier with 2SC1815/2SA1015, to use 2N3904/2N3906. How legally hearing there was no difference, I said it's not bad to go on these transistors. And the result is very surprising.

Another important aspect of this amplifier is the fact that, especially in the input circuit, is required to match depending on the current gain of the transistors: N-CH with N-CH and P-CH with P-CH. This leads to easier sorting operation of the transistors, the more so as, if you buy transistors from the same lot, the characteristics of N-CH are very close to the N-CH, respectively P-CH with P-CH. Advantage that should be mentioned even more because there are many electronic hobbyists and professionals who do not have access to a large amount of electronic components to sort them.

Below I have posted schematics of the amplifier (GX400A - MOSFET version, GX400B -BJT version - both versions use the same PCB). You will notice a method of achieving a bias circuit, which is not the same in the two versions, because they need a bias BJT faster than with vertical MOS.

I attached a picture below with the PCB amplifier.

Purchase price of PCBs GX400 are as follows:

1 pcs. 10 USD / PCB pcs.

2 pcs. 9.5 USD / PCB pcs.

If you buy more than 3 pieces: 9 USD / PCB pcs

The shipping isn't included in the above prices.

Payment can be made via pay-pal at:

tehnium[dot]azi@gmail[dot]com

At this time I have two pieces fully assembled: BJT transistor version and a version with MOSFET transistors; the price of 75 USD / piece - see: GX400_foto2.jpg below.

I did some tests but in romanian language - I will add a subtitle as soon as possible but most likely next month:
TEST GX400A - YouTube
TEST GX400B (inclusiv THD test si calcul Slew rate) - YouTube

For more details please contact me via private messaging diyaudio.com or via email: donpetru@gmail[dot]com
Attached Images
File Type: jpg PCB - GX400 rev.2.jpg (373.4 KB, 616 views)
File Type: jpg GX400_foto2.jpg (494.7 KB, 588 views)
File Type: png GX400A.png (170.0 KB, 590 views)
File Type: png GX400B.png (163.1 KB, 575 views)
File Type: jpg Test GX400 - 1kHz.jpg (478.4 KB, 541 views)
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Last edited by donpetru; 23rd June 2014 at 05:41 PM.
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Old 23rd June 2014, 08:07 PM   #2
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Default I'll take 8 PCB's and the two already built unit

I will take eight (8) PVB's at $9.00 US Dollars each. That comes to $72.00
US Dollars. I will also take the two (2) built units at $75.00. Hence, the total
comes to $147.00 US Dollars plus shipping to the United States of America.
Le me know how much the total will be. Take care and thanks for the offer
to DIYAUDIO users.
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Old 24th June 2014, 07:40 AM   #3
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mrsavage, I sent you a private message (check the private message box).

Two (2) built units cost 2 x 75 = 150 USD. At the moment I have one unit assembled with MOS-FET and one assembled with BJT.
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Old 24th June 2014, 09:55 PM   #4
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Default Change my order to 10 PCB's and no pre-built PCB's

Please change my order to 10 PCB's and no pre-built PCB's. The total would
be $90.00 plus shipping to the United States of America. Let me know
what the shipping would be. Take care and thanks.
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Old 25th June 2014, 06:31 AM   #5
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10 PCB's GX400 = $90 + $35 shipping = $125 (Ship with Romanian Post - is the same with Post Office or U.S. Mail - see: USPS.com - package will arrive in 2 ... 3 weeks).
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Old 30th June 2014, 04:29 PM   #6
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Have remained available only 16 pieces PCB GX400.
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Old 28th July 2014, 06:34 PM   #7
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Default Bill of Materials and Schematric foir the BX400 Amplifiers

Since I purchased several of these PCB's, I need a Bill of Material and a better
schematic diagrams for the two versions of this amplifier. Please post BOM and
larger schematics for this amplifier, so I can build these PCB's.
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Old 31st July 2014, 05:13 PM   #8
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@mrsavage, I attached here the files that you need. Check and PM. And sorry for the delay.

At this time there are only 10 pieces available PCB GX400.
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Old 2nd August 2014, 12:32 PM   #9
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Some images with GX400 and TA1000PS, in the same audio amplifier enclosure, posted by user @niksound on my website.
Attached Images
File Type: jpg GX400 and TA1000PS _ photo1.jpg (108.9 KB, 44 views)
File Type: jpg GX400 and TA1000PS _ photo2.jpg (111.8 KB, 45 views)
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