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Old 1st April 2015, 07:41 AM   #1
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Smile New Class-A Amplifier Module

Here is the final 3D PCB layout for the New Class A amplifier module. The New Amplifier module is on schedule for release around Mid April 2015. More updates to follow very soon.
The new Class A module has electronic voltage regulation for the Input-VAS stages, DC Servo for less than 1mv DC offset, Baker clamps for perfect high frequency clipping behavior and 4 position DIP switch selection for 9dB of gain adjustment starting at around 27dB down to 18dB of Global Gain.

Click the image to open in full size.

The PCB has been designed around the NXV500L form factor and the 4 main output devices have the same positions as the NXV500L module, so for those that already have the 500L or R2 module and want to try out the Class A module, the new Class A module is a practical drop in replacement, with exception to a power supply replacement or reconfigure to suit the Class A module requirements.

With 4 single die lateral MOSFETs on board this module can deliver just over 20 watts in Pure Class A into 8 and 4 ohm loads. With Dual Die Laterals installed this could be almost doubled in power output if you are looking for a bit more power output. Please let me know if any of you would be interested in the higher powered version of this amplifier module?

The Input-VAS stage supply requires +-30 volts to +-35 volts DC input from a raw DC supply to feed the on board power voltage regulators which the regulate this down to a very smooth and quiet +-26 VDC.
The Output stage just requires +-22VDC from a 160VA raw DC supply.
DC supply filtering for the output stage is recommended at 20,000uf per voltage rail as a starting point.
Input-VAS DC raw filtering is much less demanding at 3300uf per voltage rails as a good starting point.

The Class A module has been designed as a Mono Block amplifier in mind, so two separate power supplies as described above would be highly recommended for the best performance.

Total Harmonic Distortion for 1 watt is 0.003% 1khz and 10khz at 0.005% into 8 ohms loads
15 watts it is almost the same at 0.0035% 1khz and 0.0047% 10khz.
Signal to Noise Ratio is -103dB at 27dB Gain.
The PCB dimensions are 220mm x 51mm

In addition to the other features of this new Class A amplifier. There is an option to remotely switch the amplifier into Green Mode or if you like low current/low power dissipation standby mode.

For more information please contact me via info@holtonprecision audio.com
holtonprecisionaudio.com

Cheers Anthony

Last edited by The Saint; 1st April 2015 at 07:44 AM.
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Old 1st April 2015, 10:18 AM   #2
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So the innput toroid should be 2x 22-25 volt AC ? 50VA
And the output toroid about 2x 18 volt AC 160VA ?
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Old 1st April 2015, 10:51 AM   #3
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Quote:
Originally Posted by Leikis View Post
So the innput toroid should be 2x 22-25 volt AC ? 50VA
And the output toroid about 2x 18 volt AC 160VA ?
Yes the input between 22-25vac would be good.
18vac would most likely load down a volt or so. This would make 18vac at 160va work very closely to the ideal.
Ideally what you are looking for is a dc level loaded of 22-23 volts for the output

Cheers Anthony
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Old 5th April 2015, 10:49 PM   #4
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The new Class A amplifier can handle 4 ohm loads up to 30 watts with 3.2 Amps of output bias and THD levels are very close to the 8 ohm load readings.


cheers Anthony
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Old 7th April 2015, 04:41 PM   #5
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Hi Anthony what you say higher power version what would we be talking? i have not come across any "monster" class A diy/amp kits close to the power of pass or krell.

I.e 200w Plus
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Old 7th April 2015, 10:48 PM   #6
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Quote:
Originally Posted by ProtoCNC View Post
Hi Anthony what you say higher power version what would we be talking? i have not come across any "monster" class A diy/amp kits close to the power of pass or krell.

I.e 200w Plus
Hi ProtoCNC

The higher powered version would be 50 watts into 8 ohms.
So a little short of the 200 Watts Class A you are looking for.

Cheers Anthony
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Old 10th April 2015, 05:24 PM   #7
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what toroids you recomend for the 50 watt version ?
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Old 10th April 2015, 11:47 PM   #8
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Quote:
Originally Posted by Leikis View Post
what toroids you recomend for the 50 watt version ?
Hello Oyvind

The transformers needed for the 50 watt version would be as follows.
Output stage transformer 300VA core 2 x 22vac secondary windings.
Input stage transformer 80VA with 2 x 25vac secondary windings.

Heat sinks need to be able to do the following.
They would need to dissipate at least 100 watts per channel in heat.
If they have around 0.2/watt or better that would be a good match.

Cheers Anthony
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Old 15th April 2015, 07:41 AM   #9
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Here is the latest photo of the new Class A amplifier module.

Click the image to open in full size.

Cheers Anthony
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Old 16th April 2015, 04:23 PM   #10
ben123 is offline ben123  Belgium
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In the 'news' section on Anthony's website;

''I am currently developing a 20 watt Push Pull Pure Class A amplifier module. This will feature a DC Current Servo Bias Generator which actively monitors the DC bias in the main output stage and locks it into place regardless of supply rail voltage and heat sink temperature. The Bias can be actively adjusted from as low as 50ma to as high as 5 amps.''

Anthony how do you compare it against your 500L?
When I first saw your new extreme power designs, I thought they are expensive, I thought your new 20w class A would be to expensive, but your price is like super good!
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