ESP is a fantastic resource so I don't like complaining about the quality of a tiny portion of it. But sometimes I think he makes it up. (maybe we all fall into that trap occasionally?)
I can't see why an extra half ohm of primary resistance can suddenly remove mechanical humming. i.e. I see no reason that a properly designed and manufacturered pair of 300VA and 500VA toroid transformers should not be mechanically as silent as each other.
I have to say, I'm not actually sure the transformer has loose windings. I'm wondering if it's the steel sheet it's bolted to and the field is interacting with it. Of course the transformer itself could be vibrating it could be acting as a sound board. I should really add some mild damping underneath it.
PCB come with both completely independent channel, instead feeding one channel for each side. Just use one bank of power supply for both L+R channel for power amp.
Not necessarily, it depends on if your PSU is bipolar or single ended.
Again, what are you building?
Again, what are you building?
I am building the f6 amp and using the v3 psu. my psu will use the antek a5-3218 (300va and18v secondaries) I chose the diodes on the BOM fep30dp-e3/45gi-nd these are 15amp 200v. reading thru the thread a second time it calls for 30amp diodes. will 15amp diodes work
started loading the board and I am having trouble getting solder to flow. tried another iron with the same result. I have not had this problem before but the traces in the board are large could this act like a heat sink
I found that. Sometimes it helps to make sure you have a small amount of excess solder on the bit when heating as it helps make thermal contact.
I find that when trying to solder to a big area plane where the pad is not fitted with thermal relief slots, that turning the temp control up from 290 C to 340 C and loading the tip with a big blob of molten solder and adding a bit of extra flux to the pad is necessary to get the plane up to temp and for the solder to flow.
Then attach the component leg.
Long term plane heating with the component leg touching will probably damage the component.
Then attach the component leg.
Long term plane heating with the component leg touching will probably damage the component.
Correct wiring for rectifier bridge for PSU v3 board?
I have read and re-read this (entire) forum, but cannot definitively tell exactly how to connect the 18V AC leads from my transformer to the PSUv3 board using the diode rectifier bridge. I've posted a photo of my current build below -- and indicted what I *think* I understand about how this should be connected to the 18V AC input. I know this is a trivial question and one I should be able to figure out (or infer) but I simply don't feel confident that I'm understanding this correctly. Thank you in advance!
I have read and re-read this (entire) forum, but cannot definitively tell exactly how to connect the 18V AC leads from my transformer to the PSUv3 board using the diode rectifier bridge. I've posted a photo of my current build below -- and indicted what I *think* I understand about how this should be connected to the 18V AC input. I know this is a trivial question and one I should be able to figure out (or infer) but I simply don't feel confident that I'm understanding this correctly. Thank you in advance!
Attachments
What's a good target for ripple on ~22 volt rails? Is 17 millivolts reasonable or should I be trying to improve that?
Moved OT conversation about F5T gain and preamp choices to it's own thread -
http://www.diyaudio.com/forums/pass-labs/304826-f5t-gain-structure-preamp-choice.html
Moved OT conversation about F5T gain and preamp choices to it's own thread -
http://www.diyaudio.com/forums/pass-labs/304826-f5t-gain-structure-preamp-choice.html
You're right. Thank you.
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I realised this 6L6...I had a power supply board with 8 X 4700uF caps, that does not trip my MCB's, but when I use the ones with 8 X 15000uF 63V caps, my 10A MCB's trip on restart...I am going to use CL-60's as per your suggestion, but not sure how far they can help me...I am sure they will get very hot very soon and may not support me on a restart.. Any calculations how this inrush current increases with Caps sizes!!