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500W (4ohm) GaN Class D Modules - Starkrimson Ultra
500W (4ohm) GaN Class D Modules - Starkrimson Ultra
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Old 21st December 2020, 05:51 PM   #1
orchardaudio is offline orchardaudio  United States
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Default 500W (4ohm) GaN Class D Modules - Starkrimson Ultra

Hi,

I am currently developing a GaN Class-D module which will do 250W into 8ohms and 500W into 4 ohms.

The module will be 4.75" (120.65mm) by 3.75" (95.25mm). See the attached image.

The modulator will be very similar to my Starkrimson (formerly BOSC) modules
you can read more about them here:
BOSC - HiFi Monoblock Class-D GaN Amp
and here
BOSC - HiFi Monoblock Class-D Amp | Audio Science Review (ASR) Forum
and here:
Fresh From the Bench: A Tale of Two Class-D Amplifiers Orchard Audio BOSC and Purifi Audio Eigentakt EVAL1 | audioXpress
and on my website of course:
Orchard Audio - Audio Power Amplifer, Monoblock Module | Orchard Audio

I expect the performance of these modules to be at least as good if not better than the Starkrimson modules.

These modules will be designed to specifically work with the Hypex SMPS1200A100 power supplies. Two modules can connect to one power supply to create a stereo system.

The modules will support both fully balanced and unbalanced connections. The gain will be ~19dB (balanced) and ~25db (unbalanced). The unbalanced connection has 6dB more gain because it will be converted to a balanced connection.

I am expecting the switching frequency to be in the 750kHz to 1.2MHz range. This will be determined by final tuning/testing.

All connections use headers and terminal blocks so that no soldering will be required.

The purpose of this post is to gauge interest to see how many here would be interested in purchasing these modules when they are completed in about 2-3 months. I expect the price of the final modules to be around $500 per module, those who do a group by for the initial builds will get at least a 20% discount.

The are multiple users here who have my BOSC/Stakrimson modules
Update 12/29/2020
The layout is finished...

I had to make the board 4.85 by 3.75 inches to add some additional circuity, due to feedback that I received for the other board.
Added LED to indicate over current
Added LED to indicate overvoltage
Added LED to indicate that board is powered up

Still need to do final checks before manufacturing the boards. However, the layout is at a good point to start getting quotes. So please let me know if you would be interested in getting one or two of these.

The board will need the following power supplies:
+/-36 to 42.5V for power stages
+9 to +15V for Driver (referenced to -36V)
+/- 12 to 22V for analog sections

A single Hypex / SMPS1200A100 provides all of the required power supplies. and can power two modules to make a stereo system.

In simulations, this amplifier achieves over 98.5% efficiency at 500W.

Click the image to open in full size.

Update 01/10/2021:
Updated specifications list:
  • Gain (balanced input): 19.3dB
  • Gain (single-ended input): 25.3dB
  • Power output into 8Ω/4Ω: 250W/500W
  • Input Impedance balanced/single-ended: 44k/22k
  • Sensitivity (balanced input): 5Vin for 250W into 8Ω
  • Sensitivity (single-ended input): 2.5Vin for 250W into 8Ω
  • Size: 4.85" (123.2mm) x 3.75" (95.3mm) x 1.45" (36.8mm)
    • 6 x 4-40 mounting holes
  • Required Power Supplies for Module
    • +/-36V (+/-30 to 42.5V) - Amplifier Power Rails
    • +15V (9 to 16V) - Mosfet Driver Supply - Referenced to -36V rail - 100mA minimum
    • +/-12V (+/-10 to 22V) - Analog Supplies - 100mA per supply minimum.
Here is a document on how to wire the SMPS1200 and modules together:
https://drive.google.com/file/d/15WS...ew?usp=sharing
Attached Images
File Type: jpg New_Amp.JPG (194.3 KB, 856 views)
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Last edited by orchardaudio; 10th January 2021 at 07:55 PM. Reason: updates
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Old 21st December 2020, 06:00 PM   #2
pinnocchio is online now pinnocchio  Canada
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Nice!

Will you offer bare PCBs like in previous version?

Do
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Old 21st December 2020, 06:03 PM   #3
orchardaudio is offline orchardaudio  United States
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Quote:
Originally Posted by pinnocchio View Post
Nice!

Will you offer bare PCBs like in previous version?

Do
Yes. With the same arrangement (will need to sign NDA to get the BOM).
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Old 21st December 2020, 06:58 PM   #4
pinnocchio is online now pinnocchio  Canada
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Cool!

I've already signed the NDA for the previous board, so I'm guessing I'm all set?

Do
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PREAMPs : AMB α10 + USSPA | LDR3x + USSPA | AMPs: AMB β24 | USSA5 | FSSA2 | MoFo | FC-100 | Modulus-686 | SimpelStark+ |
DACs : Mirand AK4490 + Discrete Output | Speakers : Troels Gravesen ATS-4 | Sagwee LT V3 |
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Old 25th December 2020, 11:02 PM   #5
orchardaudio is offline orchardaudio  United States
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Quote:
Originally Posted by pinnocchio View Post
Cool!

I've already signed the NDA for the previous board, so I'm guessing I'm all set?

Do
You are all set.
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Old 28th December 2020, 05:16 PM   #6
johnnyk9 is offline johnnyk9  United States
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I may be interested in a pair if timing is right.
Well done sir.
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Old 28th December 2020, 06:07 PM   #7
orchardaudio is offline orchardaudio  United States
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I will have an update on this shortly. I am almost done with the layout and will start quoting hopefully by end of this week.
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Old 29th December 2020, 09:23 PM   #8
orchardaudio is offline orchardaudio  United States
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The layout is finished...

I had to make the board 4.85 by 3.75 inches to add some additional circuity, due to feedback that I received for the other board.
  • Added LED to indicate over current
  • Added LED to indicate overvoltage
  • Added LED to indicate that board is powered up

Still need to do final checks before manufacturing the boards. However, the layout is at a good point to start getting quotes. So please let me know if you would be interested in getting one or two of these.

The board will need the following power supplies:
+/-36 to 42.5V for power stages
+9 to +15V for Driver (referenced to -36V)
+/- 12 to 22V for analog sections

A single Hypex / SMPS1200A100 provides all of the required power supplies. and can power two modules to make a stereo system.

In simulations, this amplifier achieves over 98.5% efficiency at 500W.
Attached Images
File Type: jpg Capture.JPG (240.9 KB, 673 views)
__________________
How do you like them apples?
www.orchardaudio.com
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Old 29th December 2020, 10:41 PM   #9
johnnyk9 is offline johnnyk9  United States
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This really has me interested.
Recently unemployed, I hope someone gets a group buy together so I can actually afford a pair.
Thank you for your efforts for
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Old 29th December 2020, 11:13 PM   #10
TNT is offline TNT  Sweden
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500W (4ohm) GaN Class D Modules - Starkrimson Ultra
What is the idle draw or say at 1 watt?

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