Hmm, some people like SRPP, some don't.... this might depend on ears, surrounding equipment, speaker timbre, ..., room, ... not at least cables and the kind of DAC of course.
Personally I have only heard such a circuit with a FET instead of the upper half tube and I liked it very much i a preamp.
So maybe there is not the perfect I/V but a right one for ears, equipment and room.
Enough wisdom 😉
What I read from John (EC Design) his DAC with his I/V stage should offer really really good resolution, stage, details,........just everything...... maybe especially with his most recent DAC MK4. If I'm right, Olivers is more MK2 and I don't remember if Johns stage at this time was the same.
I appreciate Lukasz approach and effort finding the best with his ears and like his entertaining style 😀
John posted that 30 R is max for 1541; Lukasz uses something around 90 R. After John he should gather higher distortion due to that. I haven't tried, but I will.
To find the right I/V stage probably means try and error or try and modify. A simple anode follower stage can sound rather different, depending on kind of biasing (resistors, LED, with or without electrolytics), type of resistors in charge.... In my mind, it shouln'd be too much effort trying different topologies. And one could keep cost low, if used not only Boutique parts for try out stages. Russian tubes are cheap, 2sk170 is still cheap, everything on a wooden board....
I'll try but it will take time, a lot of time.
Btw, the TNT I/V stage should sound very good as well and only cheap parts are used as well.
Hm, some try to implement the new Pass I/V in their 1541. Be quick to get some J74 😉 before you have to buy them in a pharmacy.
And others, all well documented here.....😱
A lot of time but not that much money
Regards Ernst
Personally I have only heard such a circuit with a FET instead of the upper half tube and I liked it very much i a preamp.
So maybe there is not the perfect I/V but a right one for ears, equipment and room.
Enough wisdom 😉
What I read from John (EC Design) his DAC with his I/V stage should offer really really good resolution, stage, details,........just everything...... maybe especially with his most recent DAC MK4. If I'm right, Olivers is more MK2 and I don't remember if Johns stage at this time was the same.
I appreciate Lukasz approach and effort finding the best with his ears and like his entertaining style 😀
John posted that 30 R is max for 1541; Lukasz uses something around 90 R. After John he should gather higher distortion due to that. I haven't tried, but I will.
To find the right I/V stage probably means try and error or try and modify. A simple anode follower stage can sound rather different, depending on kind of biasing (resistors, LED, with or without electrolytics), type of resistors in charge.... In my mind, it shouln'd be too much effort trying different topologies. And one could keep cost low, if used not only Boutique parts for try out stages. Russian tubes are cheap, 2sk170 is still cheap, everything on a wooden board....
I'll try but it will take time, a lot of time.
Btw, the TNT I/V stage should sound very good as well and only cheap parts are used as well.
Hm, some try to implement the new Pass I/V in their 1541. Be quick to get some J74 😉 before you have to buy them in a pharmacy.
And others, all well documented here.....😱
A lot of time but not that much money
Regards Ernst
It's pretty good. It sounds remarkably similar to the creek cd50mk2, which has a CS dac, and is generally rated very good (in its price range).
I hope the tda1541 project will be better though....
Personal announcement
Well my friends it is time to say thanks to all of you, who like and ordered my pcb´s.
Because i am no developer of electronic circuits but have the knowledge to design pcb´s, i wanted to give something back to the community.
Since i started with my 1st pcb, the Optical-Volume-Control on 15th October 2009, a small donation from every sold pcb goes to diyaudio.com
Today i am proud to say that your
cumulated donation achieve
$ 1.500
Keep on having fun with my pcb´s and best regards
Oliver
Because i am no developer of electronic circuits but have the knowledge to design pcb´s, i wanted to give something back to the community.
Since i started with my 1st pcb, the Optical-Volume-Control on 15th October 2009, a small donation from every sold pcb goes to diyaudio.com
Today i am proud to say that your
cumulated donation achieve $ 1.500 Keep on having fun with my pcb´s and best regards
Oliver
All modules are in stock again
Hi Mr. Oliver:
Many congratulations for what you achieved to DIYAUDIO from the sales of your PCB!
Here the modules I want:
+/- Power Supply Module
TDA1541A shunt regulator Module (x2)
Shunt regulator Module for add. +5V line
TDA1541A DAC Module
NL17SZ02 adapter pcb
Cheers,
Antonio
Hi Mr. Oliver:
Many congratulations for what you achieved to DIYAUDIO from the sales of your PCB!
Here the modules I want:
+/- Power Supply Module
TDA1541A shunt regulator Module (x2)
Shunt regulator Module for add. +5V line
TDA1541A DAC Module
NL17SZ02 adapter pcb
Cheers,
Antonio
Oliver, that's awesome! I can't wait to hear this thing.
I have a question. I only have 12 Stealth diodes left. The +5v and -5v shunt supplies to the chip, can they be fed from 4x diodes, like a DC coupled unit, or is there some reason why I should isolate their earths completely and use 4x diodes each side?
Many thanks
I have a question. I only have 12 Stealth diodes left. The +5v and -5v shunt supplies to the chip, can they be fed from 4x diodes, like a DC coupled unit, or is there some reason why I should isolate their earths completely and use 4x diodes each side?
Many thanks
My thoughts were to separate all lines. That includes the rectifier.
If you want, you could change it to a symmetrical design like in the DCB1 😉
I think I have it - I'll steal 4x Stealth diodes back out of the heater unit of the Tube-I-Zator, and put MUR860s in there.
Am I right in thinking that the heater unit of the tube is not the most audio critical part?
Thanks again!
Am I right in thinking that the heater unit of the tube is not the most audio critical part?
Thanks again!
Update On Build
How is everyone getting on with there builds?
I thought i would post an update of my progress...
Here is an overview...looking similar to Oliver's 😉
The +- Power Supplies...just awaiting the stealth diodes
The Salas Shunt Regs...Completed 😎
The master dac board finished. The slave dac board awaiting a Tda1541a, 74HC02 - NL17SZ02 adapter pcb and i will change 8 Oscon Sp for Oscon Sepc 🙂 The Twisted Pair Spdif-I2s Board can be seen behind.
Tube-i-zator board is awaing the Outputcaps(i will use the claritycap MR 2.2uf caps i am using in my current cd player), Also awaiting stealth diodes and Tx2575 Cathode and I/V resistors 😀
I have also ordered the HV Shunt Board...so that needs to be populated...And I have also ordered the C-Core transformer from AE Europe.
Still lots to do...but its getting there. I am also wondering how im gonna get all this into a case!!! Im actually thinking about making one out of wood.
Lets see/hear some updates on how others are getting on?
How is everyone getting on with there builds?
I thought i would post an update of my progress...
Here is an overview...looking similar to Oliver's 😉
An externally hosted image should be here but it was not working when we last tested it.
The +- Power Supplies...just awaiting the stealth diodes
An externally hosted image should be here but it was not working when we last tested it.
The Salas Shunt Regs...Completed 😎
An externally hosted image should be here but it was not working when we last tested it.
The master dac board finished. The slave dac board awaiting a Tda1541a, 74HC02 - NL17SZ02 adapter pcb and i will change 8 Oscon Sp for Oscon Sepc 🙂 The Twisted Pair Spdif-I2s Board can be seen behind.
An externally hosted image should be here but it was not working when we last tested it.
Tube-i-zator board is awaing the Outputcaps(i will use the claritycap MR 2.2uf caps i am using in my current cd player), Also awaiting stealth diodes and Tx2575 Cathode and I/V resistors 😀
An externally hosted image should be here but it was not working when we last tested it.
I have also ordered the HV Shunt Board...so that needs to be populated...And I have also ordered the C-Core transformer from AE Europe.
Still lots to do...but its getting there. I am also wondering how im gonna get all this into a case!!! Im actually thinking about making one out of wood.
Lets see/hear some updates on how others are getting on?
Hi Malka07:
Uauuuu!!! What a gret job! Congratulations!
I hope in the near future to do something like you. For now I´m only collecting the needed PCBs.
Keep us informed about how it sounds when it are ready to sing for you.
Cheers,
Antonio
Uauuuu!!! What a gret job! Congratulations!
I hope in the near future to do something like you. For now I´m only collecting the needed PCBs.
Keep us informed about how it sounds when it are ready to sing for you.
Cheers,
Antonio
Hi Malka,
I have currently got a TDA board and a tube-I-zator board, part populated, but will receive the full set of shunt regs (-15, -5, +5, +5, +150) and a second TDA board this week. The difference with my project is that I'm not doing such massive banks of caps in the power supply. I think Oliver got a bit carried away there 😉 I will use 6x 2,200uF Pannasonic FC caps (13,200uF) per rail which is P-L-E-N-T-Y enough (way more than you see on VERY expensive devices.) I will either point to point them, or make a PCB up.
I have a lot of parts but need to buy a ton of stuff still and am awaiting paypal funds to pay for it all - this project is going to be about £400 when finished I think, and I wasn't expecting that at all.
If the wife finds out, I'm in the sh*t!
I will post pics when I'm done, but in the meantime, I'd love to hear your listening impressions when you're up and running...
I have currently got a TDA board and a tube-I-zator board, part populated, but will receive the full set of shunt regs (-15, -5, +5, +5, +150) and a second TDA board this week. The difference with my project is that I'm not doing such massive banks of caps in the power supply. I think Oliver got a bit carried away there 😉 I will use 6x 2,200uF Pannasonic FC caps (13,200uF) per rail which is P-L-E-N-T-Y enough (way more than you see on VERY expensive devices.) I will either point to point them, or make a PCB up.
I have a lot of parts but need to buy a ton of stuff still and am awaiting paypal funds to pay for it all - this project is going to be about £400 when finished I think, and I wasn't expecting that at all.
If the wife finds out, I'm in the sh*t!
I will post pics when I'm done, but in the meantime, I'd love to hear your listening impressions when you're up and running...
Last edited:
A question - The grey Wago terminal blocks separable? Can they be slid into individual pieces, or adapted from 4 to 3 blocks easily like some other terminal blocks?
Thanks for your comments Antonio and Lucas, i will definitely keep you updated on how it sounds...but that wont be for a while yet!!!
I know what you mean Lucas...these projects always start out cheap..and end up costing a BOMB!!! Hope the wife doesnt find out!!!
Im not sure if i understand what your asking with regards the wago terminal blocks...but they are available in different sized blocks...2's, 3's, 4's etc..
Alon
I know what you mean Lucas...these projects always start out cheap..and end up costing a BOMB!!! Hope the wife doesnt find out!!!
Im not sure if i understand what your asking with regards the wago terminal blocks...but they are available in different sized blocks...2's, 3's, 4's etc..
Alon
I bought 2-blocks only, since Mouser was out of stock. I could indeed build this into a 4-block by ripping off one of the sides (they are separable)
Very cool 
Hi Lucas,
with the big capacitor value of the PSU, i followed a recommendation of Are Waagbø who tested a Borbely Audio Shunt in the audioXpress (February 2008).
Alon,
two things:
1st - don´t forget to make a small brige from the +5V line Analog to the +5V line Digital, otherwise the 74HC02 - NL17SZ02 adapter pcb has no power!
2nd - did you cancel the TB2 bridge on the Tube-I-zator? That´s the disused HV-Line if you use the HV-Shunt Reg. I couldn´t see it correctly on the photo.
I will post my Star-Grounding scheme later to prevent ground loops 😉
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