Hallo Hans,
It is just an rc filter 4E7 and the 47µf cap ( c1)
It reduces the ripple before ging into the regulator.
It also gives a voltage drop that might be needed to let the 7810 work without overheating because there is no heatsink used.
8 decks with transformer output?
What about your power supply? Chokes?
Greetings, Eduard
It is just an rc filter 4E7 and the 47µf cap ( c1)
It reduces the ripple before ging into the regulator.
It also gives a voltage drop that might be needed to let the 7810 work without overheating because there is no heatsink used.
8 decks with transformer output?
What about your power supply? Chokes?
Greetings, Eduard
Hi Eduard,
Thanks for your reply.
But I think it's not ment as RC filter. I think it has something to do to with decoupling the deck's from each other.
Voltagedrop is about 0,2 volt and not notable.
and yes:
-transormer output
-custom UI-transformer wit seperate primairy and secundary coils for better filtering
-pi-filter with MKP/oil and one (or two) chokes. No electrolytic capacitors.
bye, Hans
Thanks for your reply.
But I think it's not ment as RC filter. I think it has something to do to with decoupling the deck's from each other.
Voltagedrop is about 0,2 volt and not notable.
and yes:
-transormer output
-custom UI-transformer wit seperate primairy and secundary coils for better filtering
-pi-filter with MKP/oil and one (or two) chokes. No electrolytic capacitors.
bye, Hans
Correct... By doing this I decouple the DECs for higher frequencies somewhat.
Also, a small fail-safe when something goes wrong. better smoke this one as something else (happened at shortcut between decks of Plus and GND)
The values are very arbitrary and I went lower to make sure the 7810 has enough headroom. dropout should be 500mV for a working DAC with the TENT shunts.
do never test the dac modules on their own by the way!!! They can blow up without any signal attached and now bias applied (through the mainboard)
Hi Eduard,
I think, I don't need much uF in my un-regulated PSU. Don't forget there is allready 2200uF on the boards (8-deck).
I think 400 uF will be enough. But we'll see.
And yes, I love the UI-transformers. They have excellent filtering capacities and that's what you want in digital powersupplies.
bye, Hans.
Hello Bastian,
I did use Silmics too but the 25 volt one.
Maybe you could use the 16 volts after the 7810 regulator.
If you are going to use a CLC or LCLC instead of the standard power supply i would surely use 25 volt for all the caps outside the boards.
The 25 volts silmics are smaller in diameter than the caps provided in the kit.
Hans i think lot of the advantages of using non electrolytic caps outside the board are not so useful if the last cap will be electrolytic.
Do you have low voltage paper in oil? With all the high voltage supplies i built so far the first cap behind the recifier better be paper in oil. I mean that is what i liked the most.
In the past devices did use lots of Henry for chokes and low µF caps because thery were expensive. But then current drawn was low not like a DDDAC with 8 boards. But you can always try.
I will try to find info how to connect the caps. I remember reading info about how to connect multiple caps in parallel. I know it is in my library somewqhere.
Greetings, Eduard
I did use Silmics too but the 25 volt one.
Maybe you could use the 16 volts after the 7810 regulator.
If you are going to use a CLC or LCLC instead of the standard power supply i would surely use 25 volt for all the caps outside the boards.
The 25 volts silmics are smaller in diameter than the caps provided in the kit.
Hans i think lot of the advantages of using non electrolytic caps outside the board are not so useful if the last cap will be electrolytic.
Do you have low voltage paper in oil? With all the high voltage supplies i built so far the first cap behind the recifier better be paper in oil. I mean that is what i liked the most.
In the past devices did use lots of Henry for chokes and low µF caps because thery were expensive. But then current drawn was low not like a DDDAC with 8 boards. But you can always try.
I will try to find info how to connect the caps. I remember reading info about how to connect multiple caps in parallel. I know it is in my library somewqhere.
Greetings, Eduard
Connecting caps
Hello,
Found the info about how to connect the caps in a power supply.
This is about the hiraga power amp. It is a symmetrical power supply with high current running because it a class A design.
The drawing on top is the original set up.
The one below the modified which gave better results. It is in French but even if you cannot read it it still can be understood.
The caps are back and are interconnected by thick copper bars. The two drawings use the same copper bars. The only difference is the exact location where the circuits are connected and we're the final caps are "" reloaded"" by the first cap after the rectifier.
You see it is not only the "" star ground"" which is important.
Greetings, eduard
Hello,
Found the info about how to connect the caps in a power supply.
This is about the hiraga power amp. It is a symmetrical power supply with high current running because it a class A design.
The drawing on top is the original set up.
The one below the modified which gave better results. It is in French but even if you cannot read it it still can be understood.
The caps are back and are interconnected by thick copper bars. The two drawings use the same copper bars. The only difference is the exact location where the circuits are connected and we're the final caps are "" reloaded"" by the first cap after the rectifier.
You see it is not only the "" star ground"" which is important.
Greetings, eduard
Attachments
one dac dack = ~210mA Mainboard is like 80mA I believe, so irrelevant
roughly 1,7 A in total....
Yes... I noticed. I was afraid something was wrong.
Why twice the older DDDAC ? Same DAC, still?
Is it the effect of the Tent-shunt ?
And the standard 12V DDDAC PSU will not work. I will inform Marco about this, so they can correct the text on the website.
Thanks, Hans
Hello Hans,
Yes it is the shunts that are to blame for the extra current being drawn.
I thought you did '' design '' your own power supply?
It is easy to make a simple CLC or LCLC that can deilver the current you need and a voltage between 12,5 and 13 volt with the right load.
What kind of non electrolytic caps are you going to use?
Greetings, Eduard
Yes it is the shunts that are to blame for the extra current being drawn.
I thought you did '' design '' your own power supply?
It is easy to make a simple CLC or LCLC that can deilver the current you need and a voltage between 12,5 and 13 volt with the right load.
What kind of non electrolytic caps are you going to use?
Greetings, Eduard
Hi Eduard,
Yes, I do design my own non-regulated PSU. And I wind my own UI-transformers. But I wanted to test the 8-deck with my 'old' 12V DDDAC PSU.
Now I need to recalculate my PSU and I think it's gonna be a double pi filter (double chokes). But I let you know.
And I use 'Anhui' MKP/oil caps. They are non-magnetic, regenerating foil and vegetabale oil. By far the best sounding caps. I tested all kind of caps and these sound the best.
So, if you're interested in all kind of caps; I've got it all : Aerovox, TCC, Siemens, GE, Obligato etc.
And, of course, the Anhui MKP/oil caps.
bye, Hans.
Yes, I do design my own non-regulated PSU. And I wind my own UI-transformers. But I wanted to test the 8-deck with my 'old' 12V DDDAC PSU.
Now I need to recalculate my PSU and I think it's gonna be a double pi filter (double chokes). But I let you know.
And I use 'Anhui' MKP/oil caps. They are non-magnetic, regenerating foil and vegetabale oil. By far the best sounding caps. I tested all kind of caps and these sound the best.
So, if you're interested in all kind of caps; I've got it all : Aerovox, TCC, Siemens, GE, Obligato etc.
And, of course, the Anhui MKP/oil caps.
bye, Hans.
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1.Shunts take extra current to make it work as shunt ...
2.It IS a 100% identical Tent Shunt. It is under licence and embedded on the Board
3. It will do for 4 Decks. Any thing else needs a bigger transformer and bigger heatsink. The rest of circuit on the dddac power supply is up to it
thanks for mentioning it to Marco
