Thank you Zen Mod. If I use the attached schematic, again do the two 15K resistors also get connected to 0V? I understand that both are effectively at 0V, but not sure what the proper thing to do is here. Do the resistor values look ok? Can I run this up to the CSX2 rail voltages, with the BJT cascode?
Attachments
I think I'm going to just leave a spot for a small daughterboard. I added some SMD bridges just because there was some space. The five-pin regulators can be two of these:
TI TPS7A4700 Ultralow Noise 4?VRMS Low Dropout Linear Regulators 5 3pin Config | eBay
or just two positive fixed voltage regulators. A bit of flexibility.
The relay allows for removing the buffer and there are two jumpers to configure the primaries. I added some zobels on the outputs as well.
Thoughts?
TI TPS7A4700 Ultralow Noise 4?VRMS Low Dropout Linear Regulators 5 3pin Config | eBay
or just two positive fixed voltage regulators. A bit of flexibility.
The relay allows for removing the buffer and there are two jumpers to configure the primaries. I added some zobels on the outputs as well.
Thoughts?
Attachments
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Balanced connection in out for CSX idea?
Dear partners of this Pass Labs threads.
Few months ago I started with the CSX1 project. Then, I got from Acroman several pieces of the pairs 82/28 and with another pieces of another friend and member, jama, we found carefully their curves envelope and matching to obtain four identical pairs.
Then looking for more damping I planned in parallel them.
I tried they and they are matched fine, with a DC of 0.01volt and a difference in the polarization of 0.2volt between the negative and positive rail.
Yesterday I start to think in the project again and trial several drawings of symmetrical connection between the devices, finally I found a schema that I will show with the object of be judged for more experienced members. Please I need your counsel if is possible to make it without troubles.
Best Regards in advance and thank for your opinion.
Dear partners of this Pass Labs threads.
Few months ago I started with the CSX1 project. Then, I got from Acroman several pieces of the pairs 82/28 and with another pieces of another friend and member, jama, we found carefully their curves envelope and matching to obtain four identical pairs.
Then looking for more damping I planned in parallel them.
I tried they and they are matched fine, with a DC of 0.01volt and a difference in the polarization of 0.2volt between the negative and positive rail.
Yesterday I start to think in the project again and trial several drawings of symmetrical connection between the devices, finally I found a schema that I will show with the object of be judged for more experienced members. Please I need your counsel if is possible to make it without troubles.
Best Regards in advance and thank for your opinion.
Attachments
Is a member of Diyaudio. cwtim01
There are a confusion between the Vfet, he tried the 2SK76 and 2SJ26 from Yamaha.
The 2SK70 and 2SJ20 are from NEC and I could see some in the chinnese market.
Take care because there are plenty of fake Vfets, I got 20 pairs of 2SJ18/2SK60 and they was all fakes.
There are a confusion between the Vfet, he tried the 2SK76 and 2SJ26 from Yamaha.
The 2SK70 and 2SJ20 are from NEC and I could see some in the chinnese market.
Take care because there are plenty of fake Vfets, I got 20 pairs of 2SJ18/2SK60 and they was all fakes.
Last edited:
New try today with the symetrical CSX
Yesterday, I tried in the workshop at the basement the voltages and the currents, the DC in the out is more difficult in stabilize, 0,2volt.
This afternoon I put in my living room, I was intrigued and I tried with one channel. The sound, very good. The loudspeakers are full range 15ohm EX4Lowther in a DIY back loaded horn (Mauhorn). I tried with bach solo cello sonata, something with King Crimson, and a little of Mahler with bestial symphonic passage. Suddenly the SMPS died,
But the sound was amazing, coherent and dynamic.
I guess I have to stabilize the DC, put a fan in the SMPS. Anybody of the people here could give an idea about the improvement?
Dear partners of this Pass Labs threads.
Few months ago I started with the CSX1 project. Then, I got from Acroman several pieces of the pairs 82/28 and with another pieces of another friend and member, jama, we found carefully their curves envelope and matching to obtain four identical pairs.
Then looking for more damping I planned in parallel them.
I tried they and they are matched fine, with a DC of 0.01volt and a difference in the polarization of 0.2volt between the negative and positive rail.
Yesterday I start to think in the project again and trial several drawings of symmetrical connection between the devices, finally I found a schema that I will show with the object of be judged for more experienced members. Please I need your counsel if is possible to make it without troubles.
Best Regards in advance and thank for your opinion.
Yesterday, I tried in the workshop at the basement the voltages and the currents, the DC in the out is more difficult in stabilize, 0,2volt.
This afternoon I put in my living room, I was intrigued and I tried with one channel. The sound, very good. The loudspeakers are full range 15ohm EX4Lowther in a DIY back loaded horn (Mauhorn). I tried with bach solo cello sonata, something with King Crimson, and a little of Mahler with bestial symphonic passage. Suddenly the SMPS died,
But the sound was amazing, coherent and dynamic.
I guess I have to stabilize the DC, put a fan in the SMPS. Anybody of the people here could give an idea about the improvement?
Attachments
Today I rise the current until 1.5A with 23,5 Volt.
45ºC, I trying in calculate the input capacitance...
Before I tried with parallel windings on the primary of the transformer with louder sound.
Today I attached and preamp but the windings in series gave better sound.
Exploring one channel with different music today, after 3 hours the DC rise a little, the SMPS with a 12 volt fan working with 4,5 gave enough air for maintain under good temperature.
The clue? somebody can counsel to me. Mr Aleksandar ZEN?
Mr Mode?
Best Regards Gentlemen
45ºC, I trying in calculate the input capacitance...
Before I tried with parallel windings on the primary of the transformer with louder sound.
Today I attached and preamp but the windings in series gave better sound.
Exploring one channel with different music today, after 3 hours the DC rise a little, the SMPS with a 12 volt fan working with 4,5 gave enough air for maintain under good temperature.
The clue? somebody can counsel to me. Mr Aleksandar ZEN?
Mr Mode?
Best Regards Gentlemen
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