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Old 15th August 2020, 06:32 AM   #1641
daniboun is offline daniboun  France
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Location: Lyon (France)
Quote:
Originally Posted by xrk971 View Post
Actually, it was designed not for automative but for professional audio - tour rigs and such. Lots of knocking about and bumps etc. But I did not want to sacrifice on sound quality or performance with regards to noise or distortion. It would indeed work fine in a car or any other high vibration environment (boom box), active speakers, motorcycles, boats, airplanes, boats, submarines, spacecraft, etc.

Secure Molex Minifit connectors are also used in all my other latest "home audio" amps (Alpha Nirvana and FH9HVX, and soon the Aurum-X) for the purposes of providing a quick and secure way to connect active power MOSFETs/BJTs to heatsinks, independent of the amp PCB. Lets you remove and service or swap out an amp board in minutes.
Thanks. It would be a nice idea to propose a new version for "domestic" use. I would imagine a version at a more interesting price without including the options related to the conditions required for the automotive world but the same sound quality.
I mean an alternative to 3E Audio for example )

By the way : Would you be able to make a new GaN Amplifier board ? I'm sure you will have lots of fans for this project)
in september I should sponsor DrMordor to start producing Gan amps )

Last edited by daniboun; 15th August 2020 at 06:48 AM.
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Old 15th August 2020, 06:35 AM   #1642
daniboun is offline daniboun  France
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Originally Posted by grufti View Post
@orchardaudio The SMPS modules in this amp look very compact. Do you know who makes / sells them?
Good question ) let us know

Last edited by daniboun; 15th August 2020 at 06:44 AM.
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Old 15th August 2020, 06:38 AM   #1643
daniboun is offline daniboun  France
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Originally Posted by surfatwork View Post
A home for a NC502 hypex amp. Made for a fellow enthusiast.
Nice amp ) NC502MP is a great board.
I own it but I prefer the NC500MP double Mono. I found it more "holographic", the sound stage is better. This is often the case for dual mono amps
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Old 15th August 2020, 08:43 AM   #1644
Mark HT is offline Mark HT
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Quote:
Originally Posted by grufti View Post
@orchardaudio The SMPS modules in this amp look very compact. Do you know who makes / sells them?
Looks like Murata 250w
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Old 15th August 2020, 04:10 PM   #1645
Audio Mo is offline Audio Mo
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@redjr

"After testing on my bench, I found that the SMPS600 and the amp did not play nice together due to excessive amount of inrush current from the SMPS to the amp. A different kind of soft-start was required, since the SMPS already had a soft-start built-in. What was needed was an inrush current limiter circuit between the SMPS and amp. I contacted xrk971, and with his help, an inrush current limiter PCB was born. It will be offered in his Esty store in the future. The prototype I tested worked fine and I was able to complete the project build. Note: This appears to only be an issue with some models of SMPS' and the amp. So if you're building this amp, please try your intended SMPS first, as it may work fine. xrk971 confirmed it worked with a different model of SMPS from Connex he used for testing. So this simply may be a one-off obscure occurrence. In fact, it worked with a lower voltage/power SMPS I tried as well - without the inrush current limiter circuit being necessary. The Inrush Current Limiter circuit is powered by the SMSP auxiliary 12v output."

Hi I have the same SMPS from the main rail is measuring 69.4v unloaded does you SMPS behave the same? I remember measuring when it was powering the amp, it read 48.1v or something close.

I recently got new amp and I'm using the same SMPS to power it but I think SMPS killed the amp. So I think its a good idea you are using an in-rush current limiter.

Last edited by Audio Mo; 15th August 2020 at 04:13 PM.
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Old 15th August 2020, 04:11 PM   #1646
orchardaudio is offline orchardaudio  United States
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Quote:
Originally Posted by grufti View Post
@orchardaudio The SMPS modules in this amp look very compact. Do you know who makes / sells them?
Murata / PQC250-54
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Old 15th August 2020, 05:26 PM   #1647
vfxsoup is offline vfxsoup  United Kingdom
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Hi. I'm new to the forum.

I'm building an amp using two PAM8320 mono 20W class D amps, with a TDA7439 audio processor for input selection, volume and tone control (driven by an Arduino I2C interface. I coded all the Arduino front-end myself).

Currently in prototyping on some perfboard & a breadboard. Experimenting with supporting components, hence the differences in the left and right amp sections. Sounds pretty good TBH, powered by my bench power supply with 9v at the moment.

Next up, is deciding on a PSU. I like the aesthetic of a linear supply but may add a 12v switching regulator afterwards to keep things stable. The digital side will have linear regulators (9v and 5v) as they both draw very little power.

I'm a newbie, so please be kind
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Old 16th August 2020, 07:36 AM   #1648
daniboun is offline daniboun  France
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Quote:
Originally Posted by orchardaudio View Post
Hi, the modules are completely my own design no off the shelf modulators or class d chips.

Specifications and test results all posted here:
Orchard Audio - Audio Power Amplifier, Home Audio, Home Stereo System | Orchard Audio - scroll down to see all of it.

Here are the specifications copied from my website:
  • Gain: 16.8dB or 6.92
  • Signal to Noise Ratio (SNR): 121dB (A-weighted)
  • Residual Noise: 32uV (A-weighted)
  • THD @ 10W: <0.0003% (-110dB) for 1kHz into 8Ω
  • THD @ 0.25W: <0.0030% for 20Hz - 20kHz into 8Ω
  • THD @ 10W: <0.0013% for 20Hz - 20kHz into 8Ω
  • THD @ 75W: <0.0050% for 20Hz - 20kHz into 8Ω
  • THD @ 150W: <0.015% for 20Hz - 20kHz into 8Ω
  • THD @ 10W: <0.0004% (-108dB) for 1kHz into 4Ω
  • THD @ 0.25W: <0.0030% for 20Hz - 20kHz into 4Ω
  • THD @ 10W: <0.0025% for 20Hz - 20kHz into 4Ω
  • THD @ 75W: <0.0092% for 20Hz - 20kHz into 4Ω
  • THD @ 150W: <0.015% for 20Hz - 20kHz into 4Ω
  • Frequency Response: DC - 80kHz+
  • Sensitivity: 5Vin for 150W into 8Ω
  • Sensitivity: 3.5Vin for 150W into 4Ω
  • Input Impedance: 5kΩ fully balanced
  • Output Power: 150Wrms
  • Damping Factor: >550 @ 1kHz
Hi,
Forgot to ask, could you please tell us more about the OP Amps installed on your great modules ?
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Old 16th August 2020, 11:24 AM   #1649
orchardaudio is offline orchardaudio  United States
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Quote:
Originally Posted by daniboun View Post
Hi,
Forgot to ask, could you please tell us more about the OP Amps installed on your great modules ?
OPA2211
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Old 17th August 2020, 02:44 PM   #1650
orchardaudio is offline orchardaudio  United States
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Group buy for the BOSC modules here:
Group Buy: Class-D GaN 150W BOSC Amplifier Modules
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