Wonderful builds !!!
Just one question: I think I am missing something (I admit, I am not following much lately) but is this regulator floating ?
Thanks,
Davide
Just one question: I think I am missing something (I admit, I am not following much lately) but is this regulator floating ?
Thanks,
Davide
No, it's not floating. It become floating if you don't connect the 0 Volt terminal to the terminal ground of the system. Also a battery can be floating or not, if the 0 Volt is not connected or connected to the ground of the sistem.
Unbalanced-Balanced output
Hello,
Sorry for my stupid question , but i want to connect the Out+ and Out- of the ES9018 to a unbalanced input amplifier. I want to use SEN IV preamplifier , but in this post, it seems everybody use a balanced version of SEN IV, with two board by channel. Can i use SEN IV preamplifier in Unbalanced mode ? If YES , what are the connections between ES9018 outputs , ground and Unbalanced amplifier input.
Thanks for your help.
Br
Jacky
Hello,
Sorry for my stupid question , but i want to connect the Out+ and Out- of the ES9018 to a unbalanced input amplifier. I want to use SEN IV preamplifier , but in this post, it seems everybody use a balanced version of SEN IV, with two board by channel. Can i use SEN IV preamplifier in Unbalanced mode ? If YES , what are the connections between ES9018 outputs , ground and Unbalanced amplifier input.
Thanks for your help.
Br
Jacky
To maximise the benefit of balanced output of the ES9018 (for distortion cancellation), you should really use the 9018 / SEN IV as balanced.
If you wish to feed this to a single ended amplifier, you need a balanced to single-ended converter, such as the XCEN.
http://www.diyaudio.com/forums/analog-line-level/216557-xcen-balanced-single-ended-converter.html
But over here there are a lot of discussions about using a single phase of the 9018.
The art of Sen - pink fish media
I have not been following this for months now, but you might find some interesting information there.
Or join their discussion .... 🙂
Patrick
If you wish to feed this to a single ended amplifier, you need a balanced to single-ended converter, such as the XCEN.
http://www.diyaudio.com/forums/analog-line-level/216557-xcen-balanced-single-ended-converter.html
But over here there are a lot of discussions about using a single phase of the 9018.
The art of Sen - pink fish media
I have not been following this for months now, but you might find some interesting information there.
Or join their discussion .... 🙂
Patrick
I found using a Jensen jt-11p-1 works great for balanced to unbalanced conversion after the I/V stage (I installed it in my amp).
Mains power supply
I've read through most of this thread, and I can't see that anyone has yet built Joachim's proposed power supply (on page 46),
but I see that more recently the Salas shunt reg is recommended.
I do have some Salas PCB's on my shelf (intended for another project) ... but would either of these two eBay mosfet regulators be good enough for the SEN -
High Speed LOW Noise Mosfet Power Supply Regulator KIT | eBay
High Quality Mosfet DC Regulated Power Supply PCB | eBay
The main difference between these eBay regs compared to the Salas is the absence of a CCS front end, am I right?
Is the CCS/shunt aspect critical to keeping the noise low?
I've read through most of this thread, and I can't see that anyone has yet built Joachim's proposed power supply (on page 46),
but I see that more recently the Salas shunt reg is recommended.
I do have some Salas PCB's on my shelf (intended for another project) ... but would either of these two eBay mosfet regulators be good enough for the SEN -
High Speed LOW Noise Mosfet Power Supply Regulator KIT | eBay
High Quality Mosfet DC Regulated Power Supply PCB | eBay
The main difference between these eBay regs compared to the Salas is the absence of a CCS front end, am I right?
Is the CCS/shunt aspect critical to keeping the noise low?
I did the same with Lundahl 1540's at the input of the power amp with very good results. the specs of the Jensen make it look slightly better for the job.
John
...or even better LL1690 Amorphous-core. But in this case i would rather look for the XCEN, since that removes the transformer from the signal path.
I prefer to use a transformer and remove the common 0v connection and get near complete isolation but I can see the attraction of the XCEN. Has anyone compared them subjectively?
Fair call. Actually I don't want to give the impression I'm looking for a cheaper competing product to the Salas units (I'm not) so my query may be best as a separate post in the Power Supplies section.
I'm now keen to buy a SEN v18 kit, and try using DAC+ and A_GROUND of the ES9018 into one half of each SEN board, as unbalanced outputs.
But a question please; it's possible in the ES9018 software-control to invert the phase of the DAC- outputs, and then use these in parallel with the DAC+ outputs.
So instead of having 4 DAC outputs into each input of the SEN, I would have 8 DAC outputs. I understand this will result in twice the current from the DAC, and half the output impedance.
Is such a configuration compatible with the SEN v18?
Thanks.
But a question please; it's possible in the ES9018 software-control to invert the phase of the DAC- outputs, and then use these in parallel with the DAC+ outputs.
So instead of having 4 DAC outputs into each input of the SEN, I would have 8 DAC outputs. I understand this will result in twice the current from the DAC, and half the output impedance.
Is such a configuration compatible with the SEN v18?
Thanks.
As already mentioned in the article, it is recommended to use a bias at least 4x of the current swing.
So if you double the output current, you should also increase the bias accordingly, e.g. by doubling the number of devices.
Patrick
So if you double the output current, you should also increase the bias accordingly, e.g. by doubling the number of devices.
Patrick
The question then becomes is it feasible to use 8x 2SK369V for a single channel on the existing SEN board?
Could I, for example, populate the extra 4x 2SK369V's into the ready-made positions on the unused half of the SEN board, then jumper the relevant points back to the first half of the board?
Also, do these two separate quad groups need to be thermally coupled?
Could I, for example, populate the extra 4x 2SK369V's into the ready-made positions on the unused half of the SEN board, then jumper the relevant points back to the first half of the board?
Also, do these two separate quad groups need to be thermally coupled?
You can solder one group on the top of the PCB, and another group on the bottom.
Then place the PCB vertically for heat dissipation for both groups.
This I prefer to you proposal.
But you probably want to use a special PCB with thicker copper.
Or hand wire them yourself P2P with 0.8mm silver plated copper wire.
For thermal tracking, couple between each quad-set groups will be fine.
No need to couple one group to the other.
Patrick
Then place the PCB vertically for heat dissipation for both groups.
This I prefer to you proposal.
But you probably want to use a special PCB with thicker copper.
Or hand wire them yourself P2P with 0.8mm silver plated copper wire.
For thermal tracking, couple between each quad-set groups will be fine.
No need to couple one group to the other.
Patrick
Sorry for the late reply.
Gogowatch has urgent private matters to handle, and is temporary out of action.
Not sure right now how long. Please be patient.
Thank you for your understanding.
Patrick
Gogowatch has urgent private matters to handle, and is temporary out of action.
Not sure right now how long. Please be patient.
Thank you for your understanding.
Patrick