Yes indeed!
The PSU has been updated, with another RC filter stage and more local decoupling around the regulators and load, the PCB layout has changed to further isolate the PSU noise from the signal circuit, an optional feedback path has been added to control DC offset if you choose to use BJT output transistors and/or want to try different opamps.
The PSU has been updated, with another RC filter stage and more local decoupling around the regulators and load, the PCB layout has changed to further isolate the PSU noise from the signal circuit, an optional feedback path has been added to control DC offset if you choose to use BJT output transistors and/or want to try different opamps.
Update -
I have the revised PCB and will be working on it soon, once the Jfet matching for the diyAudio store is completed. Hopefully I'll have photos to share in the next couple of days. 🙂
I have the revised PCB and will be working on it soon, once the Jfet matching for the diyAudio store is completed. Hopefully I'll have photos to share in the next couple of days. 🙂
just to stir things up , I have few questions :
-can we use 12V6 Accus ?
-will it drive F4 ?
-is it better than BA3 FE ?
-will it drive F4 ?
-can I use 32R phones ?
-can I use Stax statics ?
-will it drive F4?
no doubt , I'll be back with more ......
I'm not sure if Patrick has developed a sense of humour/sarcasm or he's being his usual diplomatic self.
As always, Zen Mod putting to use his well refined sense of bastardness. 🙂
I just purchased a new set of headphone. Some highly sensitive Magnetic Planar Oppo head phones.
I won't be needing any more than 6dB gain (I'd even be happy with unity gain) but you guys have my full attention.
I'm a sucker for a new project.
I won't be needing any more than 6dB gain (I'd even be happy with unity gain) but you guys have my full attention.
I'm a sucker for a new project.
I haven't read all 15 pages just yet, but I'm begging you to do away with opamps. This is DIY.
Even a baby AlephJ with 2sk2013 output wouldn't be hard to build and appeal to many.
Or headphone version of firstwatt SIT Amp
Even a baby AlephJ with 2sk2013 output wouldn't be hard to build and appeal to many.
Or headphone version of firstwatt SIT Amp
Ok. Read all 15 pages. I'm sure this will be a fine amplifier but what happened to the Zen philosophy of this place.
I learned few things about PL gang in last few yrs :
- never doubt in their capability to make even better (plenty of reasons for present status)
- never doubt in their good intentions
- they're still young , Greenhorns in fact ......... plenty of time to play with real deal ....... toobz
there is no project made for everyone
so - just take it or leave it
I'm sure plenty of Greedy Boyz will buy new cans and enjoy
Yeah Tubes make sense on a headphone amp. I'd be satisfied with something inspired from Zen articles or Sweetspot using Cree Jfet or even 2sk2013 or a lateral or countless other possibilities.
I like to support peoples ideas so I'm tempted to buy in, but really for my specific headphones there are more suitable choices.there is no project made for everyone
so - just take it or leave it
I'm sure plenty of Greedy Boyz will buy new cans and enjoy
It would be nice to see more of this though.
Probably should finish Patricks Jfet headphone amp first.
As mentioned earlier in the thread, you could build a discrete opamp. Papa even has an article on how to do it - https://www.passdiy.com/project/amplifiers/diy-op-amps
You could also bypass the opamp entirely as 6L6 stated in posts 34 & 35.
If you want more of a Zen style, depending on how you want to use the amp I bet it would be a reasonable approach to bypass the op amp to make a unity gain amp, and feed it with a DAC attached to a Zen I/V stage with the gain increased as per the article.
Honestly, we can complain about the fact that there is an op amp in the design until the cows come home, or we can accept Wayne chose the best tool for the job, or we can work around it to acheive what we want. This is DIY after all!
You could also bypass the opamp entirely as 6L6 stated in posts 34 & 35.
If you want more of a Zen style, depending on how you want to use the amp I bet it would be a reasonable approach to bypass the op amp to make a unity gain amp, and feed it with a DAC attached to a Zen I/V stage with the gain increased as per the article.
Honestly, we can complain about the fact that there is an op amp in the design until the cows come home, or we can accept Wayne chose the best tool for the job, or we can work around it to acheive what we want. This is DIY after all!
An externally hosted image should be here but it was not working when we last tested it.
Yeah. Not arguing.
I just got over excited. A bit like when the first prequel to Star Wars was released. Super excited then afterwards, it was like "aah that was ok"
I can build my own design but I'm too lazy to do point to point wiring or make pcbs these days, so tend to support other peoples ideas.
I just got over excited. A bit like when the first prequel to Star Wars was released. Super excited then afterwards, it was like "aah that was ok"
I can build my own design but I'm too lazy to do point to point wiring or make pcbs these days, so tend to support other peoples ideas.
Yes this project does use an opamp. You can put a socket in and swap to your hearts content. Or solder in two fets and drive the output stage or a small board with what ever you want.
I tried to keep it simple because for some people it is difficult to get two transistors biased up.(it was for me at one point) The skill level here is from very basic to very advanced so this is a basic project that should pretty much just work.
I tried to keep it simple because for some people it is difficult to get two transistors biased up.(it was for me at one point) The skill level here is from very basic to very advanced so this is a basic project that should pretty much just work.
Attachments
Thanks for yours and 6L6 work on this.
I'll build it as a reference to compare it to other designs.
I'm looking forward to the flexibility of this design - Want to use Mosfet output? Sure. Bipolar? Sure! Fet-input opamp? Absolutely! Bipolar-input opamp? Of course! All-discrete? Use a discrete opamp! 🙂
And, due to the sonic transparency of a source-follower Class-A output stage, (and directly into headphones...) this should be a fantastic tool to listen to the differences in opamps.
And, due to the sonic transparency of a source-follower Class-A output stage, (and directly into headphones...) this should be a fantastic tool to listen to the differences in opamps.
Can't wait to see the final result 😉 Now I need to return to my scotch directly from the cast, 61%, Aberlour Abun'dha, single malt 😉