Salas Reflector D board adjustment for 4 pole capacitor (Mundorf M-Lytic AG+)
Step one:
Look at the salas_top.jpg
You will need to drill four holes (1,5mm diameter).
Keep in mind that:
- Mundorf 4 pole has 35mm diameter and Salas board accepts caps up to 30mm diameter.
- four legs of this cap (Vin +/- and Vout +/-) do not form perfect square as seen in the picture. Do not change the layout of hole since they assure proper
adjustment between Vin +/- an Vout +/- cap and salas board.
You have to drill those holes precisely to fit the cap on the board between: RR, J1, D1 and place for board screw.
Step two:
Look at the salas_bottom.jpg
Yellow lines are the ones where you need to cut traces (or part of traces around pin 2) on the board.
Blue ones mean wire connections between cap leg and copper trace on the board.
Be careful with pin 2 - it should not have connection with the trace on which the hole is drilled and the trace should not be totally cut at the same time.
4 pole caps have lower ESR and better HF filtering than 2 pole caps, which among other parameters is something that we all crave for in audio circuits.
Salas and Tea-Bag you might consider adjusting your board for four pin cap. Doing so you will increase flexibility of the board by adding one more option into it, saving current footprint at the same time.
Step one:
Look at the salas_top.jpg
An externally hosted image should be here but it was not working when we last tested it.
You will need to drill four holes (1,5mm diameter).
Keep in mind that:
- Mundorf 4 pole has 35mm diameter and Salas board accepts caps up to 30mm diameter.
- four legs of this cap (Vin +/- and Vout +/-) do not form perfect square as seen in the picture. Do not change the layout of hole since they assure proper
adjustment between Vin +/- an Vout +/- cap and salas board.
You have to drill those holes precisely to fit the cap on the board between: RR, J1, D1 and place for board screw.
Step two:
Look at the salas_bottom.jpg
An externally hosted image should be here but it was not working when we last tested it.
Yellow lines are the ones where you need to cut traces (or part of traces around pin 2) on the board.
Blue ones mean wire connections between cap leg and copper trace on the board.
Be careful with pin 2 - it should not have connection with the trace on which the hole is drilled and the trace should not be totally cut at the same time.
4 pole caps have lower ESR and better HF filtering than 2 pole caps, which among other parameters is something that we all crave for in audio circuits.
Salas and Tea-Bag you might consider adjusting your board for four pin cap. Doing so you will increase flexibility of the board by adding one more option into it, saving current footprint at the same time.
Thank you TioFrancotirador
For the great explanation!
It is not so complicated, but it is very delicate...
I wish boards were prepared to 4 poles.
For the great explanation!
It is not so complicated, but it is very delicate...
I wish boards were prepared to 4 poles.
Very few use such parts but I note it to see what I can do when time for PCB works comes again across the projects. If its not too complicated or changing the size of the board maybe it will squeeze in along the classic snap-in lytic pads. If they combine. How much such a 4 pole M-Lytic costs?
Expensive, but some want to make Ref-D Rolex grade builds for all components, I understand that facet of the hobby will never stop to tease curiosity. Problem is it would probably ask for alternative jumpers between 4pole & 2pole. Complicated, and can confuse some builders. Will see when a rework opportunity comes along.
Oooops!!
You don't have to buy it in France...
I also live in France, but delivery from parts connection or hificollective
takes the same time.
Same as many other suppliers.
(AG+070) - 10000uF 80V Mundorf MLytic AG+ Electrolytic Capacitor | Hifi Collective
You don't have to buy it in France...
I also live in France, but delivery from parts connection or hificollective
takes the same time.
Same as many other suppliers.
(AG+070) - 10000uF 80V Mundorf MLytic AG+ Electrolytic Capacitor | Hifi Collective
Salas Reflector D or Salas SSLV1.1 BIB to power AVDD of DAC chip.
AVDD in my ak4495 dac is powered by Salas Reflector D directly now. Among many other regulators I have tried so far (Placid HD 2.1, Burson, Bellson super reg, Teddy Padro, audio-gd shunt, TPS7A4700, ADM7150ARDZ) salas is simply the best.
I knew powering AVDD is critical, just did realized it is that much. It seems like AVDD should be treated more like analog that digital in terms of powering.
I want to make further steps here and power left (AVDDL) and right (AVDDR) channel separately. Since ak4495 accepts up to 7.2V I could use either two Salas Reflector D or Dual + Salas SSLV1.1 BiB shunt reg running at 7V.
My question here is: which of both designs (assuming using same quality parts) would be better in terms of sound quality? Or, at least theoretically, Which of both would have better specs that counts for audio: lower noise, lower impedance @ audio bandwidth frequencies, flatten frequency response, any other parameter that matter here?
Salas can you help here. Thanks.
AVDD in my ak4495 dac is powered by Salas Reflector D directly now. Among many other regulators I have tried so far (Placid HD 2.1, Burson, Bellson super reg, Teddy Padro, audio-gd shunt, TPS7A4700, ADM7150ARDZ) salas is simply the best.
I knew powering AVDD is critical, just did realized it is that much. It seems like AVDD should be treated more like analog that digital in terms of powering.
I want to make further steps here and power left (AVDDL) and right (AVDDR) channel separately. Since ak4495 accepts up to 7.2V I could use either two Salas Reflector D or Dual + Salas SSLV1.1 BiB shunt reg running at 7V.
My question here is: which of both designs (assuming using same quality parts) would be better in terms of sound quality? Or, at least theoretically, Which of both would have better specs that counts for audio: lower noise, lower impedance @ audio bandwidth frequencies, flatten frequency response, any other parameter that matter here?
Salas can you help here. Thanks.
Use the Ref-D since its a chip circuit you are feeding. Try the R6 VAR vs R6=K117GR mod sometime also to see what you prefer (post#151 & 152).
Thanks Salas. I surely will. Seems like all elements around vref circuit has sound quality impact. I recently changed C2 from Elna Silmic II to Sanyo Os-Con 1000uf. Gave it some time to burn. Polymer seems to be more precise and much better on heights resolution. However Elna has much more natural and real tone for me, which is more of my taste.
I think that sometimes, in some situations, Os Con impress with a very "clean" sound, but after a while one gets a bit tired...It cleans to much🙂, giving a feeling of lack of body.
Just my experience and taste.
Just my experience and taste.
Hello Salas
can you help me here as well ...
Please take look at the picture I attached.
I want to power this Dac board ak4490 with to separate Salas Reflector D for left and right channels.
To simplify explanation lets take powering only one channel into consideration.
It has AVDD pin (where C14 is located) and VREF (where C20 is located).
Both pins AVDDL and VREFL will be powered by one Salas Ref-D running at ~7V.
My first question is:
1. Does the C14 electrolitic 100uF is necessary when shunt regulator is used @ AVDDL?
C20 is used to achieve high voltage stability @ VREFL pin, the bigger the cap here, the less distortions is introduced to the bass (this is what documentation of the dac states).
AVDDL draws current, VREFL sense the voltage.
Now since Salas Ref-D has remote sensing I want to get rid of the electrolytes (C14,C20) and place salas sensing wires 0S+ in place of C14 (close to AVDDL to sense drawing current best) and force wires 0F+ in place of C20 (close to VREFL to have most stable voltage here).
Does it make sense in your opinion?
can you help me here as well ...
Please take look at the picture I attached.
I want to power this Dac board ak4490 with to separate Salas Reflector D for left and right channels.
To simplify explanation lets take powering only one channel into consideration.
It has AVDD pin (where C14 is located) and VREF (where C20 is located).
Both pins AVDDL and VREFL will be powered by one Salas Ref-D running at ~7V.
My first question is:
1. Does the C14 electrolitic 100uF is necessary when shunt regulator is used @ AVDDL?
C20 is used to achieve high voltage stability @ VREFL pin, the bigger the cap here, the less distortions is introduced to the bass (this is what documentation of the dac states).
AVDDL draws current, VREFL sense the voltage.
Now since Salas Ref-D has remote sensing I want to get rid of the electrolytes (C14,C20) and place salas sensing wires 0S+ in place of C14 (close to AVDDL to sense drawing current best) and force wires 0F+ in place of C20 (close to VREFL to have most stable voltage here).
Does it make sense in your opinion?
An externally hosted image should be here but it was not working when we last tested it.
This is a very theoretical question since such chips usually have peculiar layout and local decoupling demands. In your shoes I would just remove those carefully, so to do the experiment, to can put them back if the result without them got worse.
decoupling is critical to fast changing signal handling circuits.
Don't change the local decoupling unless you are capable of measuring the before and after performance and how the digital signals are read and processed.
What do you think modifications performed here
Google Translate
there multiple page on Reflektor,
Salas you know This paper?.
Google Translate
there multiple page on Reflektor,
Salas you know This paper?.
Its Kazuo Ozawa's page from Sapporo Japan. A dedicated Reflektor fan, an experimenter and gentleman that we had many exchanges in the simplistic Mosfet regulators thread. I also mention him in the thanks section in the pdf guide.
There are many ways to revolve around the core circuit that bring pros and cons. So many in fact that the simplest golden section one had to be chosen for a PCB GB. I did that after much thought and evaluations. The only drastic simple alternative I recommend is the K117GR instead of R6 simple mod personal evaluation. All other things will perplex and are only recommended for the perfboard and oscilloscope experimenter Reflektor fan in the general thread discussions as we did with Kazuo San.
There are many ways to revolve around the core circuit that bring pros and cons. So many in fact that the simplest golden section one had to be chosen for a PCB GB. I did that after much thought and evaluations. The only drastic simple alternative I recommend is the K117GR instead of R6 simple mod personal evaluation. All other things will perplex and are only recommended for the perfboard and oscilloscope experimenter Reflektor fan in the general thread discussions as we did with Kazuo San.