For a sensitive front end I would adopt an interwinding screen and an IEC mains filter.
If the transformer is a toroid that is very close to the front end, or an EI inside the same box, then a belly band around the transformer will help reduce interference.
For sizing, adopt a VA that ensures it does not run continuously at more than 50% of rating for a capacitor input filter.
If the transformer is a toroid that is very close to the front end, or an EI inside the same box, then a belly band around the transformer will help reduce interference.
For sizing, adopt a VA that ensures it does not run continuously at more than 50% of rating for a capacitor input filter.
No question those folks make excellent toroids.
But no matter what you do you still face the problem of AC noise with any toroid. Their measures minimize radiated noise but other than a really good filter or an EI isolation transformer it will still come in.
The Rcores are very fashionable these days but whether you can find one that meets the requirements can be a challenge.
I have used the LUNDAHL C cores and like everything they make they are well made and a good value considering their construction quality but the distributor in the US does not carry any that would be appropriate for the SALAS. You may be lucky being in Europe - they might be available there. That would be my first choice.
The split bobbin EIs are very good. There is a UK company that makes really good ones and I think I have heard they will make a custom. This company is recommended by Ron Coleman whose advice is always good. 1 PH Trans
I would use these folks but the freight would be too much!
Hope this is of use.
But no matter what you do you still face the problem of AC noise with any toroid. Their measures minimize radiated noise but other than a really good filter or an EI isolation transformer it will still come in.
The Rcores are very fashionable these days but whether you can find one that meets the requirements can be a challenge.
I have used the LUNDAHL C cores and like everything they make they are well made and a good value considering their construction quality but the distributor in the US does not carry any that would be appropriate for the SALAS. You may be lucky being in Europe - they might be available there. That would be my first choice.
The split bobbin EIs are very good. There is a UK company that makes really good ones and I think I have heard they will make a custom. This company is recommended by Ron Coleman whose advice is always good. 1 PH Trans
I would use these folks but the freight would be too much!
Hope this is of use.
Hi Salas Hope I have done this right came to diyaudio late in life so don't know a lot ,as per pic ,fitted 470 ohm resistors as dummy load and dc is now 46 so do I need to fit any resistors to rd/link ,,,,,,,, john
Attachments
No you don't need to fit anything, obviously those transformers being small are showing a large difference between loaded and unloaded. They must have gone near nominal secondary AC values now because they are designed for UK mains. Measure AC voltage input while loaded to double check.
*We are many non EE hobbyists here, we started with very little knowledge just like you so don't worry we are here to help, we have been through all possible silly blunders already with still many more to come our way
*We are many non EE hobbyists here, we started with very little knowledge just like you so don't worry we are here to help, we have been through all possible silly blunders already with still many more to come our way
*We are many non EE hobbyists here, we started with very little knowledge just like you so don't worry we are here to help, we have been through all possible silly blunders already with still many more to come our way
Me 1 non EE!!!!!!!!!!!
Thank you ,, I have made a mistake Salas I had power coming in via my safety lamp forgot all about it,,,,
In that case you must fit RD yes. Do you have any 10 Ohm 2-5W in hand?
They have 230VAC primary printed on their label but they tend to be stronger like those who were designed for the 220VAC older mains level. You will probably need RD (drop resistor) between bridge and filter cap like Lucylu, but no big deal. Makes an EMI filter for the diodes noise too. Good transformers in general.
Transformer
Ah ok. Stupid of me to think the French would tell the truth Just kidding ofcourse. I love the French
We will see what comes out of them. I will probably have to wait a few weeks for the thing to arrive.
Yesterday night I finished soldering the boards! A bit faster than I anticipated. I had some spare time on my hands.
I do own a lab power supply so I will start with testing this weekend!
Cheers!
Ah ok. Stupid of me to think the French would tell the truth
Just kidding ofcourse. I love the French We will see what comes out of them. I will probably have to wait a few weeks for the thing to arrive.
Yesterday night I finished soldering the boards! A bit faster than I anticipated. I had some spare time on my hands.
I do own a lab power supply so I will start with testing this weekend!
Cheers!
It's good to have both the 0.01% and people with common sense here to stop us from burning it all down
. Do proceed slowly when on for you uncharted waters. Ask and ask again until it is clear how to proceed!Regards
Maybe in full VA loading they would drop to nominal. But its very difficult to get them hot or dropping while loaded lower. In our level of use they behave like nothing happens versus various others toroid and EI that I had.Ah ok. Stupid of me to think the French would tell the truth
We will see what comes out of them. I will probably have to wait a few weeks for the thing to arrive.
Yesterday night I finished soldering the boards! A bit faster than I anticipated. I had some spare time on my hands.
I do own a lab power supply so I will start with testing this weekend!
Cheers!
Set the Lab PSU for 150mA CC mode per phono channel. It should read about 100mA current draw per channel on CV mode and not go to CC limit mode if all is well. That is when feeding at the regulators inputs. Good luck testing.
I can tell you that us "non EE" guys really appreciate all the effort you tech guys put into this community. I do for sure! Because of all the help my house did not burn down(yet) and my stereo set-up sounds sweet!
As we say in Holland: 3 x hoera!!! Hoera, Hoera, Hoera
That was for you tech guys(and girls of course)
As we say in Holland: 3 x hoera!!! Hoera, Hoera, Hoera
That was for you tech guys(and girls of course)
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