Hi all
There is some great contributions with open source designs and gerbers on diyAudio. The hardest part is deciding which one to build 🙂.
I think some of these have made their way to Aliexpress sellers. Sometime ago I came across the Ultimate Fidelity 100w amp on AE which appeared to be one of the revisions from the thread here.
Does anyone know of any boards/kits/amps from AE based of designs from here?
There is some great contributions with open source designs and gerbers on diyAudio. The hardest part is deciding which one to build 🙂.
I think some of these have made their way to Aliexpress sellers. Sometime ago I came across the Ultimate Fidelity 100w amp on AE which appeared to be one of the revisions from the thread here.
Does anyone know of any boards/kits/amps from AE based of designs from here?
I would be concerned with AE vendors are stealing someone’s intellectual property. It would be better support and buy from Diyaudio store or direct from a group buy. You would certainly get better support if you have issues.
I was referring to open source designs where the the gerbers are freely available.
I only know about the Apex FH9, called 100 Watt Ultimate Fidelity Amp. The design is awful, the chinese did not take the gerber files from this forum, made their own pcb.
The second amp, ist the DX Amp, designed by Carlos, Destroyer X. Not easy to find at AE. For a few month there was a LJM Mod available. Not much difference to the original DX Amp. The sound is quite good.
I dont know you are searching for...a finished board or a kit ?
I you want to buy a good sounding amp, finished board, have a look at the "GHX" Amp. Its a blameless amplifier built on the schematic from D. Self, showing in the i-net.
Pictures https://www.diy-hifi-forum.eu/forum/showthread.php?23270-GHX-AMP-Verst%E4rker-im-Eigenbau
I added the missing coils to the output stage, 2,2 µh and a 10 ohm 5 watt resistor. If you want to tune the amp a little bit, you can add 100 nf capacitors to the bigger rail capacitors. They are missing. The bias is 65-70 mA, Rail +-45 Volt. I used a connex SMPS 500r.
In the moment special offer https://de.aliexpress.com/item/32847643038.html
If you want to build a very good sounding amp, have a look at this little amp https://www.diyaudio.com/community/threads/fh9-xrk-mod.406709/page-5#post-7620179
Gerbers and boom are available in the thread. You have to solder by yourself. I uploaded the gerber files to JLCPCB. All needed informations in the thread.
If yo only want to buy from AE, forget aubout the last Amp...
Kind regards
Peter
The second amp, ist the DX Amp, designed by Carlos, Destroyer X. Not easy to find at AE. For a few month there was a LJM Mod available. Not much difference to the original DX Amp. The sound is quite good.
I dont know you are searching for...a finished board or a kit ?
I you want to buy a good sounding amp, finished board, have a look at the "GHX" Amp. Its a blameless amplifier built on the schematic from D. Self, showing in the i-net.
Pictures https://www.diy-hifi-forum.eu/forum/showthread.php?23270-GHX-AMP-Verst%E4rker-im-Eigenbau
I added the missing coils to the output stage, 2,2 µh and a 10 ohm 5 watt resistor. If you want to tune the amp a little bit, you can add 100 nf capacitors to the bigger rail capacitors. They are missing. The bias is 65-70 mA, Rail +-45 Volt. I used a connex SMPS 500r.
In the moment special offer https://de.aliexpress.com/item/32847643038.html
If you want to build a very good sounding amp, have a look at this little amp https://www.diyaudio.com/community/threads/fh9-xrk-mod.406709/page-5#post-7620179
Gerbers and boom are available in the thread. You have to solder by yourself. I uploaded the gerber files to JLCPCB. All needed informations in the thread.
If yo only want to buy from AE, forget aubout the last Amp...
Kind regards
Peter
There's even a member cloning many different types of QUAD amplifiers and selling the boards, if I'm not mistaken. No idea why he doesn't get sued.
Carlos had his design stolen, out of respect for his memory, please do not buy them.
1 - small quantities
2 - as long as there are not patents involved there isn't anything illegal about cloning. There can only be a case being made about copyright infringement for the schematics.
3 - patents expire after about 2 decades
Talking of which, since the UCD Class-D patent expired a while ago, I am surprised not seeing any UCD clones.
As an homage to Carlos i have build a Blame ST AMP today... i have made a pcb from the DX Amp too...
I know LJM has a build an amp with very similar design and with similar name. Dont find it in the moment. If it is true that LJM made a mod of the DX amp, dont know. His name was on the back of the pcb.
I also think..dont buy such an amp.
I know LJM has a build an amp with very similar design and with similar name. Dont find it in the moment. If it is true that LJM made a mod of the DX amp, dont know. His name was on the back of the pcb.
I also think..dont buy such an amp.
I cannot locate the DX amp on Aliexpress; do you have a photo that I can use as a reverse image search or reference? I think they’ve changed the names.
I see that you have built a number of amps. Are your recommendations the same today as when you posted above?
Kit or prebuilt is fine.
Finally a thread bump. if there is any other diyaudio or similar forum kits on AE since original post feel free to update.
I cant update anything....
The reason is that i dont buy any amp boards at Aliexpress anymore. Here in the forum there are a few good amps to built. I want to learn some more about designing amps and i have fun using KiCad to make my own pcb's.
Buy the 100 Watt Ultimate Amp at Aliexpress as a kit and use it as parts carrier. Then order the FH9 XRK Mod pcb's and you will get a good sounding amp.
There are a few components to make something better. You can read in the thread of chermann, Chris, about the FH9.
As i wrote...i would buy a GHX amp, if searching for a finished board. The newer ones have a cap parallel to the pot, on my board it is missing. I think it will make the adjusting less sensitiv. A well known from DIY-Hifi-Forum bought the boards and is satisfied with the sound. A blameless amp....
I have searched for the DX Amp, but it seems to be out of stock on Ali, but you can order at Ebay https://www.ebay.com/itm/115902952840.
Greets
Peter
The reason is that i dont buy any amp boards at Aliexpress anymore. Here in the forum there are a few good amps to built. I want to learn some more about designing amps and i have fun using KiCad to make my own pcb's.
Buy the 100 Watt Ultimate Amp at Aliexpress as a kit and use it as parts carrier. Then order the FH9 XRK Mod pcb's and you will get a good sounding amp.
There are a few components to make something better. You can read in the thread of chermann, Chris, about the FH9.
As i wrote...i would buy a GHX amp, if searching for a finished board. The newer ones have a cap parallel to the pot, on my board it is missing. I think it will make the adjusting less sensitiv. A well known from DIY-Hifi-Forum bought the boards and is satisfied with the sound. A blameless amp....
I have searched for the DX Amp, but it seems to be out of stock on Ali, but you can order at Ebay https://www.ebay.com/itm/115902952840.
Greets
Peter
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