Wow, 56uH inductor. What is the Self Resonant Frequency of that inductor?
The inductance drops to 23.9uH temperature rises 30C at rated 9.8A current.
2200LL-560-H-RC
Does someone have some excess PCBs which could be posted from within Germany? Would love to try out!
I know I am overenthousiastic about you product, Mark, sometimes probably upsetting you, and I understand nothing has been validated / released now... and may never be.
Nevertheless, I hope you won't take offense if I again I applaud your progress on this... and other projects (4 front ends for Sony V-FET amps!). A lot of work with a lot of care. Regarding this latest SMPS filter, IF and WHEN the time is right, I shall be delighted to give it a try.
Out of curiousity, with today's knowledge and if that has been projected, in the case of the Sony V-FET amps, is that SMPS filter a replacement of the existing one or would it come after / before as addition to it?
Again, well done and thanks for all this
Claude
Nevertheless, I hope you won't take offense if I again I applaud your progress on this... and other projects (4 front ends for Sony V-FET amps!). A lot of work with a lot of care. Regarding this latest SMPS filter, IF and WHEN the time is right, I shall be delighted to give it a try.
Out of curiousity, with today's knowledge and if that has been projected, in the case of the Sony V-FET amps, is that SMPS filter a replacement of the existing one or would it come after / before as addition to it?
Again, well done and thanks for all this
Claude
Hallo devize,
I would have a couple spare PCBs as well ... have also the inductors, resistors and capacitors from the original BOM and could send you a "kit" or two 🙂
Best regards, Claas
I would have a couple spare PCBs as well ... have also the inductors, resistors and capacitors from the original BOM and could send you a "kit" or two 🙂
Best regards, Claas
I'm working on a high current version and it MAY go into the new Pass VFET amplifier but no decisions will be made until we know whether it works at all, and how well it filters noise.
Thanks Mark
All the best for this development and all others, thanks again for all this fascinating stuff!
Claude
All the best for this development and all others, thanks again for all this fascinating stuff!
Claude
PO89ZB for a new Hagerman Bugle 2 phonostage // opinion ???
I received this note in a private message. However, because I believe that 250,000 heads are better than one, I am copying it here so the entire membership of diyAudio can share their knowledge, opinions, and personal experiences. Please read and reply if you have a contribution to make or a thought to share.
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I received this note in a private message. However, because I believe that 250,000 heads are better than one, I am copying it here so the entire membership of diyAudio can share their knowledge, opinions, and personal experiences. Please read and reply if you have a contribution to make or a thought to share.
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Probably not line-induced noise
It sounds like a ground loop-related issue. Turntables and phono cartridge grounding, in my experience, are very poorly thought out and hum and ground loops are easy to create. Plus, it may be that the Bugle 2 board's installation into the writer's system has caused the ground loop issue.
Very difficult to tease out. Best advice would be to tell the writer, to make sure the turntable is itself grounded to the pre-amp. and to ask if the RCA jacks are isolated from the the chassis, which helps to reduce possible ground loops IMO.
It sounds like a ground loop-related issue. Turntables and phono cartridge grounding, in my experience, are very poorly thought out and hum and ground loops are easy to create. Plus, it may be that the Bugle 2 board's installation into the writer's system has caused the ground loop issue.
Very difficult to tease out. Best advice would be to tell the writer, to make sure the turntable is itself grounded to the pre-amp. and to ask if the RCA jacks are isolated from the the chassis, which helps to reduce possible ground loops IMO.
PO89ZB kits! In the diyAudio Store! Kits, I tell you: kits
I hope everyone saw Tom's message but in case not, here it is again, in bold italics.
I hope everyone saw Tom's message but in case not, here it is again, in bold italics.
Check for ground loops how the turntable is grounded and phone preamp is grounded. Also the shield for the wires should not be used to carry signal (single end connection for the shield or to the chassis only).
Here are some pretty good articles on the subject: Jensen Transformers Application Notes | Jensen Transformers
AN003 Interconnection of Balanced and Unbalanced Equipment
AN004 Hum & Buzz in Unbalanced Interconnect Systems
AN006 Jensen System Troubleshooting Guide
AN007 Generic Student Seminar Handout
AN009 Ground Loops – The Rest of the Story
Wow. I wonder if one can buy just the boards. I've built two of these, just mounted one in my B1 Korg, and have a full set of parts for two more.
Hi Mark, does this filter fit in front of the Chromecast Audio and Topping E30 power supply?
Thanks and congratulations
Thanks and congratulations
PCB size is found in post #514
DIY builders' photographs of mounting arrangements are attached to posts number
1 , 90 , 168 , 264 , 270 , 275 , 327 , 329 , 444 , 550
DIY builders' photographs of mounting arrangements are attached to posts number
1 , 90 , 168 , 264 , 270 , 275 , 327 , 329 , 444 , 550
sorry maybe I wrote wrong, this filter works well in front of the power supply of the Chromecast Audio and Topping E30?
Thank you
From the very first post in this thread...
"With this PCB and these components, the design limits are 48 volts maximum and 3 amperes maximum. You shouldn't exceed 48V, no matter what the current. And you also shouldn't exceed 3A, no matter what the voltage."
See the specs for your two devices. If they are within those parameters, you should be just fine.
"With this PCB and these components, the design limits are 48 volts maximum and 3 amperes maximum. You shouldn't exceed 48V, no matter what the current. And you also shouldn't exceed 3A, no matter what the voltage."
See the specs for your two devices. If they are within those parameters, you should be just fine.
I received this note in a private message. However, because I believe that 250,000 heads are better than one, I am copying it here so the entire membership of diyAudio can share their knowledge, opinions, and personal experiences. Please read and reply if you have a contribution to make or a thought to share.
In the EE curriculum when I was at university, we only used "polarity dots" when drawing schematics that have two (or more) mutually coupled inductors. Those dots indicated which end of each inductive winding have in-phase outputs, and we called them "phase dots". We never put those dots on individual inductors. Only on transformers and loosely coupled inductors like electromagnetic actuators. So I myself have no idea what the question even means. If you do, please speak up.
In the EE curriculum when I was at university, we only used "polarity dots" when drawing schematics that have two (or more) mutually coupled inductors. Those dots indicated which end of each inductive winding have in-phase outputs, and we called them "phase dots". We never put those dots on individual inductors. Only on transformers and loosely coupled inductors like electromagnetic actuators. So I myself have no idea what the question even means. If you do, please speak up.
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