Load 3.8Ω
1. Sine 1khz wave before clip about 37-38 volt p-pk and my true rms multimeter shows me 12.67-13Vac
2. 1khz square wave about 18 ppk
3. 10khz square wave about 17 ppk
4 . Load 3.8Ω
1. Sine 1khz wave before clip about 37-38 volt p-pk and my true rms multimeter shows me 12.67-13Vac
2. 1khz square wave about 18 ppk
3. 10khz square wave about 17 ppk
4 . Load 3.8Ω
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What preamp do AN39 amp owners use to pair it? I am currently using HPA clone by Jeff Young and gain is high and haven’t tried the FE22 with this which is built with 13db gain.
My source is Roon with RopieeeXL heavily modified with linear psu’s for Pi and Aya 5 as dac via coaxial digital input.
Thanks
My source is Roon with RopieeeXL heavily modified with linear psu’s for Pi and Aya 5 as dac via coaxial digital input.
Thanks
I use Salas Dcg3 at lower gain....
This weekend unbraid my mosfets wires.... painful...
This weekend unbraid my mosfets wires.... painful...
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It's really annoying to take apart a finished and working device...it's not a fun thing to do 🙁
I'm going to use the Yarra preamp with the Hakuin stage of about 12dB gain. I have lowered the gain of the amplifier to about 10dB. Speakers 92dB sensitivity.
Regards
I'm going to use the Yarra preamp with the Hakuin stage of about 12dB gain. I have lowered the gain of the amplifier to about 10dB. Speakers 92dB sensitivity.
Regards
Did you notice any sonic improvement, Nikos?
I don't use a "preamp", per se; the signal chain for my active setup is:
* digital sources --> 4-way digital source selector --> miniDSP 'nanoDIGI' --> 3x Topping E30s --> 2x AN4Rs and 2x subs.
Then where do you control the volume? I didn’t want to use any digital volume at the source hence use a preamp and also gives me additional input options like vinyl TT.
Both the 'nanoDIGI' and the Topping E30 DACs offer volume control. I have my E30s set to "DAC mode" (ie. no volume control) and use the nanoDIGI's volume control.
I also have a TT. Given my active setup + subs requires a miniDSP to provide delay - as well as the active XOs - I have to turn my vinyl signal into a digital stream, somewhere in the chain.
The best solution is to use an excellent A2D converter (rather than use the one that comes inside a miniDSP) - hence vinyl becomes just one of the four inputs to my 4-way digital source selector.
"Dropping bits" by using a digital volume control is never a problem if you're running at 24/96 like I am (or even higher resolution).
Hi Andy
We have very shiny days about 23-24 C ....
And I didn't spend time on the amplifier for listening , I wasted a lot of time on the changes... I also removed the 100Ω gate resistors on the main board i did some sine -square test without load ....everything its ok.
I also put a 5mm copper shield between the ΑΝ39 boards and the MCU fan it seems to slightly affect the output with optical noise the output of my amplifier, meters in AC mv about 0.45-0.60 mv on my cheap multimeter dint change after that ....
Μaybe I should move this board further but I have no reason since I have no noise at all even if I place my ear deep inside the woofer, only visual indication on the scope..we talking about 0.0.. Ac μv.
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A slight update on my amp, replaced the 0.22 biasing resistors to 0.15R/5w on both sides. I could set the voltage to max of 8.3v one channel and 8.35v on the other across the 3.3k resistor, as the trimmer is out of turns at max. I could see the bias is now 0.7v on both the channels giving me around 2.3A current (4.667A) measured across both the power resistors. Heat sinks are able to hold on to the extra heat measuring 350/150/55mm when I ran for more than an hour. I am liking the sound with this bias with my PAP clone 4 ohm speakers 🙂
Hi!
Here is my amateur prototype build of AN 8R 😉
I'm very satisfied by the sound. Super low frequency and the rest too.
There is a lot of power from this little class-A thing and that is best.
It is running on +-22V 1,5A and here is some current on the output when amp is warm and stabilizes at abut 10mV when hot(49 celcius on heatsink).
I took it as a mono radio setup to my apartment to listen while renovating the bathroom and kitchen. The speaker is also prototype one with Mr Nelson Pass idea of passive 3-way filter (as much as possible xD). Another advantage are cheap parts. Cooling is problematic but with a little fan it is possible to use higher voltage and current up to 2,6A. I use 2X850gram alu heatsinks. PCB is mounted by the same screws as output mosfets for easy unmounting. I will make a stereo version for sure also with less power as it is enought for my needs and saves energy xD
Thanks to the inventor for sharing this great amp.
Here is my amateur prototype build of AN 8R 😉
I'm very satisfied by the sound. Super low frequency and the rest too.
There is a lot of power from this little class-A thing and that is best.
It is running on +-22V 1,5A and here is some current on the output when amp is warm and stabilizes at abut 10mV when hot(49 celcius on heatsink).
I took it as a mono radio setup to my apartment to listen while renovating the bathroom and kitchen. The speaker is also prototype one with Mr Nelson Pass idea of passive 3-way filter (as much as possible xD). Another advantage are cheap parts. Cooling is problematic but with a little fan it is possible to use higher voltage and current up to 2,6A. I use 2X850gram alu heatsinks. PCB is mounted by the same screws as output mosfets for easy unmounting. I will make a stereo version for sure also with less power as it is enought for my needs and saves energy xD
Thanks to the inventor for sharing this great amp.
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I'm pretty much a noob to audio electronics building, having only built a few projects so far. That said, I'm very interested in building this amp for my LaDolce Audio/ABX open baffle speakers. After reading through the majority of this thread I am feeling a little nervous about taking on this project..
Any suggestions for an approach to this that might be more or less suited towards someone with novice electronics skills, or should I go with something else before attacking this level of amp building?
I'd appreciate any pointers!
Any suggestions for an approach to this that might be more or less suited towards someone with novice electronics skills, or should I go with something else before attacking this level of amp building?
I'd appreciate any pointers!
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I'm afraid I think the AN is not a build for a noobie - if only because it uses a number of SMD parts (which are a pain to solder, compared to thru-hole parts).
I had read a fair amount about the Nirvana before I realised I already too many projects ahead of it.
But I had not seen that some of it is SMD. If I had, with my limited skills I wouldn’t have looked any further
But I had not seen that some of it is SMD. If I had, with my limited skills I wouldn’t have looked any further
Okay, I just ordered a smd soldering kit to do some practicing. At some point you have to learn right? I want to learn and improve my skills so I can do things that are difficult so I can get to where I need to be so I can accomplish my goals! If anyone has additional suggestions please let me know. I am committed.
Finding out it’s not wise to build such a great amplifier must be a little disappointing. While there are many diy amp options I’m guessing you mightn't be aware of which would sound broadly similar to the Nirvana. I gave it a little thought
As the ABX are very efficient unless you listen pretty loud and a fair distance away you “don't need many” watts. Though it’d be wise to quantify-estimate before looking for any amp.
As you apparently and understandably want “the class A sound” at the risk of suggesting a rival camp in this thread 😉 ☮️ one or more of the Pass designs might currently be available as a kit at the diyaudio audio store at present, and might(?) not involve SMD.
HTH
Well, I had someone suggest this project, but I'm feeling pretty determined to challenge myself and move forward in both learning and improving my system... I don't want to be hardheaded though so... 🤷🏻
https://diyaudiostore.com/pages/project-aleph-jzm