Mine is slightly different. His doesn't have the transformer snubbers and I'm not sure of the purpose of the bypass caps on the output.
I put snubbers on the transformer, per the Quasimodo thread: Simple, no-math transformer snubber using Quasimodo test-jig
I've got a few boards, you can PM me if you're interested.
I put snubbers on the transformer, per the Quasimodo thread: Simple, no-math transformer snubber using Quasimodo test-jig
I've got a few boards, you can PM me if you're interested.
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Hi,
I got 2 questions:
- Is it ok to put 3300/25V caps instead of 35V on the phono board ? 7924/7824 are for +/-24Vdc, so I think some very good and long life 25Vdc Panasonic FR would be fine.
- Is it ok to use a 22µF/25V silmic 2 or bipolar Nichicon Muse ES with R14 to stabilize offset ? I got some in stock.
Thanks
Damien
I got 2 questions:
- Is it ok to put 3300/25V caps instead of 35V on the phono board ? 7924/7824 are for +/-24Vdc, so I think some very good and long life 25Vdc Panasonic FR would be fine.
- Is it ok to use a 22µF/25V silmic 2 or bipolar Nichicon Muse ES with R14 to stabilize offset ? I got some in stock.
Thanks
Damien
And can you confirm that if offset is stabilized with this cap with R14, I don't have to put C13 ?
Damien
Damien
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C13 can safely be omitted after adding the new cap between R14 and ground. I did this be adding a jumper across C8, effectively shorting the larger cap. No problems at all since I made this change years ago.
Two boards with matching JFETs on their way !
Question : with the improved SMPS technology of now and the SMPS DC Filter P089ZB Kit, is there a way to use an SMPS ?
Question : with the improved SMPS technology of now and the SMPS DC Filter P089ZB Kit, is there a way to use an SMPS ?
Working on designing boards to accommodate some capacitor changes on it. I needed to do this since the caps I want to use are too different in physical dimensions to work on my boards I picked up when they first hit the streets.
I have never used any schematic software before, so I am still getting used to it, but I do like this KiCad program. Furthermore, I have attached a few screenshots of where I am now. I still have some things to do as can be seen. I also need to see where TP1 ties in. I believe it is from the output of R17 to the wiper of P1, but I need to verify that.
I have never used any schematic software before, so I am still getting used to it, but I do like this KiCad program. Furthermore, I have attached a few screenshots of where I am now. I still have some things to do as can be seen. I also need to see where TP1 ties in. I believe it is from the output of R17 to the wiper of P1, but I need to verify that.
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Get the power supply components off the board.
Tighten the layout to keep ground connections compact.
Thank you for your thoughts.
There are no power supply parts in there; basically I have Wayne's schematic and layout open in another window and laying out everything as he had them; so no PS parts.
Why I have you; do you feel the uTracer3+ would be a good enough device for someone using it for the tubes they own and then maybe a few more down the road or maybe wait for the 6? Thanks.
There are no power supply parts in there; basically I have Wayne's schematic and layout open in another window and laying out everything as he had them; so no PS parts.
Why I have you; do you feel the uTracer3+ would be a good enough device for someone using it for the tubes they own and then maybe a few more down the road or maybe wait for the 6? Thanks.
Ahh, could be. Just keep in mind I am just redoing the original design except for some cap changes. And those screenshots I posted are not of the finished version.
After going through everything again it does not seem to hard to take those regulator section’s off the Pearl board and place them on their own board. Include them on a PS board so all of those components are together. Has anyone done this before?
Thanks, James
Thanks, James
@exojam
As an exercise (so far) I've taken a couple of circuits (not this one) and made layouts that separated signal circuitry from PSU distribution circuitry. The intent was to get a compact and straightforward signal layout without having to use unnecessarily-long traces to accommodate components. I did the layouts for stacked boards interconnected with short wire links or resistor links. Indeed, with one phono circuit I separated the passive components from the active ones from the PSU distribution.
I haven't implemented these yet... I'm trying to work up the courage to use a computer layout programme.
It wasn't the inspiration, but after the fact I realized that the Lyra Connoisseur Phono preamp was executed in a similar vein.
As an exercise (so far) I've taken a couple of circuits (not this one) and made layouts that separated signal circuitry from PSU distribution circuitry. The intent was to get a compact and straightforward signal layout without having to use unnecessarily-long traces to accommodate components. I did the layouts for stacked boards interconnected with short wire links or resistor links. Indeed, with one phono circuit I separated the passive components from the active ones from the PSU distribution.
I haven't implemented these yet... I'm trying to work up the courage to use a computer layout programme.
It wasn't the inspiration, but after the fact I realized that the Lyra Connoisseur Phono preamp was executed in a similar vein.
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Download KiCad and have some fun!
I had never used a PCB program myself until a few weeks ago. I wanted to change up a few things on the Pearl, so I said what the hell. It is a free program that works on Windows and Linux. Documentation is very good, active forum and lots of YouTube videos to help.
I only have about 10 hours on it, and I was able to put what I posted above together. Now with the suggestions from the gentleman above I am removing the voltage regulators and associated parts and making another board. The new board will hold those parts along with a power supply section. It is fun if you enjoy this type of stuff.
I had never used a PCB program myself until a few weeks ago. I wanted to change up a few things on the Pearl, so I said what the hell. It is a free program that works on Windows and Linux. Documentation is very good, active forum and lots of YouTube videos to help.
I only have about 10 hours on it, and I was able to put what I posted above together. Now with the suggestions from the gentleman above I am removing the voltage regulators and associated parts and making another board. The new board will hold those parts along with a power supply section. It is fun if you enjoy this type of stuff.
I do enjoy figuring out the layouts. I loved sticking down those GC donuts and Letraline on mylar to formalize my hand-drawn layouts (usually after many iterations). Making the boards was not a reliable process for me... part of why I guess I'll have to learn one of these programs so that I can get someone to make the boards.
I don't enjoy a computer program telling me how to do 'em or getting in the way of how I want to work. I had enough of that at work with AutoCad and Microsoft (anything).
I don't enjoy a computer program telling me how to do 'em or getting in the way of how I want to work. I had enough of that at work with AutoCad and Microsoft (anything).