16V - I am using a lab supply with adjustable current limit for safety.
I actually did find the time to assemble the transformer cradle, rectifiers etc. last night so I will be using this soon.
Did you happen to find a suitable inrush current limiter thermistor at Digikey?
I actually did find the time to assemble the transformer cradle, rectifiers etc. last night so I will be using this soon.
Did you happen to find a suitable inrush current limiter thermistor at Digikey?
> Simply like this?
NO.
Turn round 90°. And remove all the jumpers to Gnd, without saying.
And read F5X Preamp Basic Circuit Topology carefully (P.2 of the article).
🙂
Patrick
NO.
Turn round 90°. And remove all the jumpers to Gnd, without saying.
And read F5X Preamp Basic Circuit Topology carefully (P.2 of the article).
🙂
Patrick
> Did you happen to find a suitable inrush current limiter thermistor at Digikey?
The one we proposed is available from DK or Mouser, not ?
Patrick
The one we proposed is available from DK or Mouser, not ?
Patrick
>NO.
Turn round 90°. And remove all the jumpers to Gnd, without saying.
Difficult to remove jumpers from a photo, but of course no connections to Gnd🙂
I actually had it turned around 90˚ first as this made more sense to me. However, electrically I cannot see the difference between these and the X (see drawing below)😕
>And read F5X Preamp Basic Circuit Topology carefully (P.2 of the article).
I guess I should read it better🙂
Turn round 90°. And remove all the jumpers to Gnd, without saying.
Difficult to remove jumpers from a photo, but of course no connections to Gnd🙂
I actually had it turned around 90˚ first as this made more sense to me. However, electrically I cannot see the difference between these and the X (see drawing below)😕
>And read F5X Preamp Basic Circuit Topology carefully (P.2 of the article).
I guess I should read it better🙂
Attachments
>The one we proposed is available from DK or Mouser, not ?
Yes you did, but as I am about to place a Digikey order I was just probing Davide.
Yes you did, but as I am about to place a Digikey order I was just probing Davide.
I just realized that heinz1 (in his unofficial BOM) had actually found them (or similar) on Digikey:
50R 6A 570-1109-ND
75R 4A 570-1011-ND
I guess I will take one of each and decide later which to use🙂
You are right.
Any of the above would have been electrically identical.
All the intersections require soldering / electrical connections, without saying.
🙂
P.
Any of the above would have been electrically identical.
All the intersections require soldering / electrical connections, without saying.
🙂
P.
One of the thermistors originally suggested by Patrick (Ametherm MS32 50006L) is not available at DK.
MS32 50006 is a non-stock item; minimum order 25: 570-1020-ND
That's why I proposed AS32 50006: 570-1109-ND
MS32 50006 is a non-stock item; minimum order 25: 570-1020-ND
That's why I proposed AS32 50006: 570-1109-ND
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Just try.
They don't cost that much.
I also cannot say anthing about those I have not tried.
And you can read datasheet as well as I do.
🙂
Patrick
They don't cost that much.
I also cannot say anthing about those I have not tried.
And you can read datasheet as well as I do.
🙂
Patrick
Test it with 2x 4ohm 100W resistor (one per rail) after the CRC boards, before you test it with the amp.
You can use the scope in ac coupling to check the ripples.
And check the DC voltages at various stages of the PSU.
Patrick
Patrick
You can use the scope in ac coupling to check the ripples.
And check the DC voltages at various stages of the PSU.
Patrick
Patrick
In the BOM for the power supply, it was listed per channel:
D8-D11, - 4 Diode, - 20A Ultra Fast, - STMicroelectronics, - STTH2002D, -
497-5276-5-ND
1) I see 16 nos here and I only have 8 from the GB.
2) Why wasn't a board done for these instead of hand wiring them?
3) It's difficult to see which wire goes into which leg of the diodes. Could Nic be kind enough to sketch out a diagram?
Thanks.
D8-D11, - 4 Diode, - 20A Ultra Fast, - STMicroelectronics, - STTH2002D, -
497-5276-5-ND
1) I see 16 nos here and I only have 8 from the GB.
2) Why wasn't a board done for these instead of hand wiring them?
3) It's difficult to see which wire goes into which leg of the diodes. Could Nic be kind enough to sketch out a diagram?
Thanks.
> 1) I see 16 nos here and I only have 8 from the GB.
There was an error in the BOM and ashaw did not notice it. Therefore you are missing 8 diodes. You have only paid for the 8 you have.
> 3) It's difficult to see which wire goes into which leg of the diodes. Could Nic be kind enough to sketch out a diagram?
See attachment.
There was an error in the BOM and ashaw did not notice it. Therefore you are missing 8 diodes. You have only paid for the 8 you have.
> 3) It's difficult to see which wire goes into which leg of the diodes. Could Nic be kind enough to sketch out a diagram?
See attachment.
Attachments
There are also some drawings in the .pdf file compiled by Mark Lai called "Xen Audio F5X Amplifier Case Assembly Notes" which was sent to case subscribers.
Thanks for the progress photos.
I'm still a bit surprised that a little rectifier board wasn't part of the project, considering all the attention paid to the other details of the amp. In the end its not that important, but it certainly would clean up things a bit under the PS heatsink.
I'm sure that a small PCB will be part of Patrick's final solution for the regulated supply once this is ready.
I actually learned a bit about P2P wiring having to do this and in the end it results very reliable and is invisible being located below the heatsink.
I actually learned a bit about P2P wiring having to do this and in the end it results very reliable and is invisible being located below the heatsink.
At the time we did this years ago, there was no rectifier board. I used P2P myself.
Also it has been a DIY project, with a lot of your own participation, and not a finished commercial product from me.
Anyway, there is one (PCB) now.
If you want to get organised, WK will get them made and send to the distributors, as before.
You can do direct paypal this time for the small sum.
But don't ask him to send to 30 addresses.
He has already way too much work ....
OK ?
Patrick
Also it has been a DIY project, with a lot of your own participation, and not a finished commercial product from me.
Anyway, there is one (PCB) now.
If you want to get organised, WK will get them made and send to the distributors, as before.
You can do direct paypal this time for the small sum.
But don't ask him to send to 30 addresses.
He has already way too much work ....
OK ?
Patrick
So we checked PCB prices.
70µm copper, double sided, blue mask, white silk screen.
4 pieces per amplifier, 80 HKD (~10 USD) all inclusive (Paypal, registered post, etc.)
Please post at one of the GB threads, and leave this for technical things.
Patrick
70µm copper, double sided, blue mask, white silk screen.
4 pieces per amplifier, 80 HKD (~10 USD) all inclusive (Paypal, registered post, etc.)
Please post at one of the GB threads, and leave this for technical things.
Patrick
Thanks Patrick. By no means was I being critical at all. I was just stating my surprise considering the amazing amount of attention to detail you have put into the project as a whole.
For those who are interested, I started Rectifier Board GB interest thread here.
For those who are interested, I started Rectifier Board GB interest thread here.