snubber
Hello,
Does your R core have a static screen?
If you turn the chokes with the mounting place ( 4 threaded holes) facing the longest side of the transformer it will pick up less '' garbage '' from the power transformer.
Sometimes snubbers are used across in and output of the chokes as well.
Greetings, Eduard
Hello,
Does your R core have a static screen?
If you turn the chokes with the mounting place ( 4 threaded holes) facing the longest side of the transformer it will pick up less '' garbage '' from the power transformer.
Sometimes snubbers are used across in and output of the chokes as well.
Greetings, Eduard
Hello,
I did do some more '' measurements '' using the ll2733 ( similar to ll1694). There were only tiny voltage differences depending on the way you connect the two coils together. Only like 10/20 millivolt. The lundahl chokes have higher inductance and higher serie resistance. The chokes i tested before were R core so the two coils sharing the same core. Lundahl also share the same core. They are much more compact.
It could be nice to try the R core when put in serie connection you will have 40mH with very low voltage drop . Less than 40 mv for a current higher than 1A.
Did finish '' drowning'' my R core deeper down in the polyurethane resin. Like i told you had to add some metal '' parts '' to the resin to make the level rise.
I ended up with a total weight above 13 kilogrammes.
Happily i did not start constructing my stainless steel mainframe for my dac. I already have some ideas. Wanna make in such a way that modifications can be done without taking most of the things apart.
Wanna mount the motherboard in vertikal direction on a metal plate with a bend corner trhat can be attached to the bottom plate. Maybe mount the wave io on the other side of the plate
In some designs here there are circuit boards everywhere. Mountings them all horizontally will take a lot of space. Usually only the mainboard with a few dac boards will go up. The rest has low profile just occupies a lot of space on the bottom.
Greetings, Eduard
p.s the thread is a bit silent. A pity i dont have the boards
Twisted Pear have finally launched their reclocking solution.
Is there any of the aficionados here that can teach us what to order and how to properly use it with our beloved DDDAC ?
Is there any of the aficionados here that can teach us what to order and how to properly use it with our beloved DDDAC ?
I have one on order. Until they release a few more details it won't be clear exactly what we need, but we will likely want a DDDAC i2s input adapter with u.Fl connectors on. Nothing too complicated. Depending on whether they have an Isolator on the output or not will dictate whether we also want a v+ available on that adapter to power one side of an Isolator.
Once we know for sure, we should get some little adapter boards made up as a group buy.
one more board
Hello,
Looks like there will another board which has to be added. Next week when i start making my '' Dac mainframe" i must take care that it must be possible to position or reposition boards every few months. This can be done by using some smaller aluminium plates that can easily be replaced by one that has 4 holes with identical mounting holes to attach it to the chassis but another pattern to mount the circuit board.
Drilling holes in a chassis heavily populated by boards and their attached cables is really tricky and is certainly not good for your solder joints.
Most of the power supply i have in stock so i can start there.
Sowthers output transformers will be ordered soon. Audio creative did tell me they never did sell them. Doede did say the logistic part will be done by audio creative. So it is a bit confusing.
Will post pictures of my mainframe when it is ready.
Greetings, eduard
Hello,
Looks like there will another board which has to be added. Next week when i start making my '' Dac mainframe" i must take care that it must be possible to position or reposition boards every few months. This can be done by using some smaller aluminium plates that can easily be replaced by one that has 4 holes with identical mounting holes to attach it to the chassis but another pattern to mount the circuit board.
Drilling holes in a chassis heavily populated by boards and their attached cables is really tricky and is certainly not good for your solder joints.
Most of the power supply i have in stock so i can start there.
Sowthers output transformers will be ordered soon. Audio creative did tell me they never did sell them. Doede did say the logistic part will be done by audio creative. So it is a bit confusing.
Will post pictures of my mainframe when it is ready.
Greetings, eduard
I see Supersurfer also placed an order with TPA. So I am looking forward to seeing how you implemented Cronus, guys.
some pics
Hello,
Here my potted transformer and an '' array '' of chokes.
And a pictures of an old mainframe . The ones i will make next week will have similar side panels but they will not be joined by L profiles in each corner but 3 stainless bar at the bottom side which will have welded nuts to mount several panels (which could have identical pattern of holes to mount them onto the bars) but different patterns depending on the parts that they will support. In such a way that replacing a circuit board would just meaning getting a new panel or adding a few holes in the existing panels. They could be 2 or 3 mm alu.
That is all for today.
greetings, eduard
Hello,
Here my potted transformer and an '' array '' of chokes.
And a pictures of an old mainframe . The ones i will make next week will have similar side panels but they will not be joined by L profiles in each corner but 3 stainless bar at the bottom side which will have welded nuts to mount several panels (which could have identical pattern of holes to mount them onto the bars) but different patterns depending on the parts that they will support. In such a way that replacing a circuit board would just meaning getting a new panel or adding a few holes in the existing panels. They could be 2 or 3 mm alu.
That is all for today.
greetings, eduard
Attachments
Yes, I also ordered the cronus/hermes boards, shipping is from 13 April so my patience is put to the test a bit longer........
I expect it will be better than running asynchronous pi with acko reclocker, but I am curious as to what level.
I expect it will be better than running asynchronous pi with acko reclocker, but I am curious as to what level.
Edward,
What is that big red box? Also, I see three Lundalh Chokes and why?
Stefan,
BBB can run as Sync to S03. Have you tried this? Of course, I have been followed TP on this subject Cronus/Hermes very closely. Haven't yet place an order but likely will.
Sent from my iPhone using Tapatalk
What is that big red box? Also, I see three Lundalh Chokes and why?
Stefan,
BBB can run as Sync to S03. Have you tried this? Of course, I have been followed TP on this subject Cronus/Hermes very closely. Haven't yet place an order but likely will.
Sent from my iPhone using Tapatalk
red box
Hello Chanh,
The red box ( inspired by a song title from Simply Red) is the polyurethane encapsuled R core 500Va transformer.
The array of chokes was just a set up to do some measurements. For the 12 volts there will be 2 like the one on the left. For the 5 volt powersupply there will be one of equal seize like the one on the left.
Lundahl has the LL1638 with 3 different air gap . Coils put in parallel one will be 2000mH 400mA and the other one will be 1000mH 800mA.
The wave IO will take 380mA. Because of the low dc voltage and the high inductance the bleeder current to assure proper choke input function need only be a few mA so the 2000mH will do. However if i will use the Salas which is a shunt i think i will need the other one if i am right but i have to ask Stefan.
Over the top? I did remember reading that Doede and some other people did compare some power supplies where a big German power supply ( Germans are usually big) did win for the 12 volt. Adding a similar supply for the 5 volt was considered an improvement as well.
This choke is only 100 euro. You know the same transformer can deliver about 30% more current when used with choke input compared to cap input because there are no charging pulses just a steady flow. 100 euro is the price of one dac board . Reading about one dac board with shunts surpassing 4 dac boards without shunts i think that choke could be a good thing.
For the 5 volt i will get another r core. BUT it will be smaller. My dac will be at at great '' height'' about 170cm so i must be able to lift it that high. So maximum weight should be 25/30 kilogrammes.
I wanna get my Sowter output transformers soon. Doede did tell me that Audio Creative will take part of the logistics but they did tell me they never sold a pair?
By the way the panels on the right side are the covers which will be bolted to the transformer housing and the 6 holes will be used to secure it to the bottom panel which will be secured to three stainless steel bars that will join the 2 side panels. Because of the sturdy '' mainframe '' the actual panel supporting all the stuff inside dont need to be thick. 2 mm alu could be perfect maybe brass or copper.
Greetings, Eduard
p.s with all these additional things added to the boards things are getting confusing that is why i concentrate on the power supply and probably just throw in some new boards once they are there.
Hello Chanh,
The red box ( inspired by a song title from Simply Red) is the polyurethane encapsuled R core 500Va transformer.
The array of chokes was just a set up to do some measurements. For the 12 volts there will be 2 like the one on the left. For the 5 volt powersupply there will be one of equal seize like the one on the left.
Lundahl has the LL1638 with 3 different air gap . Coils put in parallel one will be 2000mH 400mA and the other one will be 1000mH 800mA.
The wave IO will take 380mA. Because of the low dc voltage and the high inductance the bleeder current to assure proper choke input function need only be a few mA so the 2000mH will do. However if i will use the Salas which is a shunt i think i will need the other one if i am right but i have to ask Stefan.
Over the top? I did remember reading that Doede and some other people did compare some power supplies where a big German power supply ( Germans are usually big) did win for the 12 volt. Adding a similar supply for the 5 volt was considered an improvement as well.
This choke is only 100 euro. You know the same transformer can deliver about 30% more current when used with choke input compared to cap input because there are no charging pulses just a steady flow. 100 euro is the price of one dac board . Reading about one dac board with shunts surpassing 4 dac boards without shunts i think that choke could be a good thing.
For the 5 volt i will get another r core. BUT it will be smaller. My dac will be at at great '' height'' about 170cm so i must be able to lift it that high. So maximum weight should be 25/30 kilogrammes.
I wanna get my Sowter output transformers soon. Doede did tell me that Audio Creative will take part of the logistics but they did tell me they never sold a pair?
By the way the panels on the right side are the covers which will be bolted to the transformer housing and the 6 holes will be used to secure it to the bottom panel which will be secured to three stainless steel bars that will join the 2 side panels. Because of the sturdy '' mainframe '' the actual panel supporting all the stuff inside dont need to be thick. 2 mm alu could be perfect maybe brass or copper.
Greetings, Eduard
p.s with all these additional things added to the boards things are getting confusing that is why i concentrate on the power supply and probably just throw in some new boards once they are there.
we need red bull
Hello,
Being diabetic i am not a big consumer of red bull just use it when to crank up when my sugars are way down.
This thread seems to go down in participation ( what we really need is audience paticipation the late Frank zappa) so we might need the audio equivalent of red bull. A group buy?
I have a free vintage 100mH 1,3A choke for the first one who comes up with usefull ideas.
Greetings, Eduard
Hello,
Being diabetic i am not a big consumer of red bull just use it when to crank up when my sugars are way down.
This thread seems to go down in participation ( what we really need is audience paticipation the late Frank zappa) so we might need the audio equivalent of red bull. A group buy?
I have a free vintage 100mH 1,3A choke for the first one who comes up with usefull ideas.
Greetings, Eduard
Hi Chanh,
I have not run bbb in sync with S03, mine is build with one 100mhz clock. I have compared my rpi-S03 build with Stijns synced bbb-S03 though. We did not find a worthwile difference.
The cronus/hermes is a different build than S03 so there will be other differences. And according to Russ (although he might be biased 😉 ) synced is definitely better than async.
Theory is nice but reality is better; so I will compare both myself............
Thanks Stefan!
Keen to hear your recommendations on the fitted Clocks with this Cronus?
My thoughts were getting the Pulsar XO, however, seems a little excessive. 🙂
So looking forward to the upcoming DDDSD! 😉
Sent from my iPhone using Tapatalk
Keen to hear your recommendations on the fitted Clocks with this Cronus?
My thoughts were getting the Pulsar XO, however, seems a little excessive. 🙂
So looking forward to the upcoming DDDSD! 😉
Sent from my iPhone using Tapatalk
ccs
I seem to recall one of the forum members posted instructions for adjusting the trimmers of all eight CCSs of a four board dddac, but I can't find them. Can somebody help? Installing and adjusting the CCSs on a single board dddac wasn't a problem, but I don't know how to go about this job.
Jan
I seem to recall one of the forum members posted instructions for adjusting the trimmers of all eight CCSs of a four board dddac, but I can't find them. Can somebody help? Installing and adjusting the CCSs on a single board dddac wasn't a problem, but I don't know how to go about this job.
Jan
What's the reason why you can't set them to 400uA off the boards, install them and leave them?
ccs
I don't know how to set the current. On my single board dddac I adjusted the trimmers until I had 2.7V on the main board output.
I don't know how to set the current. On my single board dddac I adjusted the trimmers until I had 2.7V on the main board output.
Jan,
dwjames is right.
You should trim each CCS BEFORE to install them in the DAC circuit and that's all.
Regards,
Enrico