Under normal operation C9 won't have any DC across it. It's only during fault conditions, like if the outputs are stuck to one of the rails C9 will see the full rail voltage. So technically the voltage rating of the cap should be the same as the rail voltage or higher. Or just use a lower voltage cap and replace it if that scenario happens. Or put anti parallel diodes across the cap to protect it from excessive voltage. On power up there might be a little voltage across C9 until the circuit stabilizes.
Jeremy
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Thanks Stuart,
Only the Q105 and Q106 must be matched?
what about the other KSC3503/KSA1381 ?
Yes only Q105 / Q106 should be matched. A close match is also good. Better that a D & E combination. The other KSC3503/KSA1381 on the boards don't need to be matched but if you can get your hands on KSC3503E use them.
^ I'm assuming you're posting this b/c of your post #1957 => your link to sell parts. If not, please ignore.
Pics of your parts being offered along with a data sheet matching the form factor and parts markings would be very helpful along with provenance.
No disrespect meant, but in the days of so easily re-etching / screen printing parts markings themselves... a printed parts bag label as evidence of parts authenticity does not pass muster (for me).
Documented provenance from origin and/or spec sheets and measurements are what counts (to me).
Pics of your parts being offered along with a data sheet matching the form factor and parts markings would be very helpful along with provenance.
No disrespect meant, but in the days of so easily re-etching / screen printing parts markings themselves... a printed parts bag label as evidence of parts authenticity does not pass muster (for me).
Documented provenance from origin and/or spec sheets and measurements are what counts (to me).
Anything speaking against using 3503E/1381E as pre-drivers, 4883A/1859A as drivers and 3263Y/1294Y as outputs (4 pair) using 57V-Rails and 4 Ohms load? I've some great hfe-matching 4883/1859 in my stash. As well as some tightly N/P-matching C3423/A1360. Is it possible to use them in the VAS? Or should the specified KSC/KSA semis be used?
Why were 680u caps chosen as the local decoupling? I've seen some "High-End"-amps using some 22-100u at this point. Is it about the ripple aviability? Would it hurt going lower cause saying I have some 330u in my stash?
Why were 680u caps chosen as the local decoupling? I've seen some "High-End"-amps using some 22-100u at this point. Is it about the ripple aviability? Would it hurt going lower cause saying I have some 330u in my stash?
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For your selection of transistors and rail voltage, everything is good. Definitely use the Sanken Y grade outputs with those drivers. As far as the C3423/A1360 I haven't used those but after looking at the datasheet they should be acceptable.
Regarding the local decoupling cap the 680uF value is not super critical it's more the ripple current rating.
Jeremy
I agree with your concern. Just wanted to show the Onsemi logo printed on the bag. These are Not toshiba or Sanyo.
I think it's best that questions regarding components etc should be posted in the build thread and not scattered over various threads.
https://www.diyaudio.com/community/...erine-build-thread.385920/page-7#post-7029955
https://www.diyaudio.com/community/...erine-build-thread.385920/page-7#post-7029955
There is a link to the Poll for another group buy of PCBs at the end of the video - hope this helpsAre there boards for sale (or the plans to get boards made at a jlpcb or others)? I was about to put an order for a Badger set of PCBs when I saw this new project, and I'd love to give it a go
Thank you!!!!
- Dan
We... The Wolverine build team would also like to know how OS is as well, but we haven't heard from him since his last post over a year ago now.
I have sent him pm's and I have his personal email address.
I have received no response from either.
Does someone of us know where he actually lives now? I remember that just a little before he stopped posting, he said that he was busy with a move from one place to another... Can someone of you US guys reach him somehow or speak to people who know him directly?