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diyAudio Power Supply Circuit Board v3 illustrated build guide
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Old 18th November 2019, 07:56 PM   #1051
Ben Mah is offline Ben Mah  Canada
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diyAudio Power Supply Circuit Board v3 illustrated build guide
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Originally Posted by ItsAllInMyHead View Post
.........
I've since read a few threads, found the power supply simulation software (a bit over my head for the moment), and read Nelson Pass's ideas on certain power supply designs. ............

It seems that adding inductance could be a potential way to improve power supply performance. Even it it's not strictly necessary, where could I learn whether adding inductance (and how to do it) would benefit my power supplies? .............
Power supply simulation is a great way to evaluate different power supply setups. I don't know which software you have tried but http://www.duncanamps.com/psud2/ is the one that I use. You can easily add/delete/change configurations and then check the resultant ripple at the supply output. By trying different types (CRC, CRCRC, CLC, etc) and varying values you can get an idea of what affects ripple the most.
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Old 18th November 2019, 09:29 PM   #1052
Extreme_Boky is offline Extreme_Boky
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A conventional bridge rectifier block (likes of KBPC2510...) vs. fast switching/soft recovery diodes... there's no rule... try both and let your ears decide. In general, with nice filtering that addresses high frequencies as well (>100kHz), the simple rectifier block sounds great.

Fast switching soft recovery diodes (switching at 100/120Hz in our case, which is nothing...), will have different sound; not better, not worse, but different. The dual diodes in a single package ones, give you two diodes in parallel, instead of one; a lot of current can go through those on a power-up, so another thing to consider... together with the ripple abilities of the smoothing caps used. Also, the wiring, in this case, is quite short... no inductance to the rescue to dampen anything...

It all goes together... the filtering, the snubbing, the length/type of wiring used, terminations to each PCB.

Build a power supply with fast switching/soft recovery diodes (short wiring!), and then play with snubbers - the type (polyester, polystyrene, electrolytes, polypropylene, brands) of capacitors used can fine-tune the sound to suit the rest of your system and your preferences.

Then, just try the rectifier blocks, and see the difference for yourself... this is a highly subjective thing.
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Old 18th November 2019, 10:02 PM   #1053
ItsAllInMyHead is offline ItsAllInMyHead  United States
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Thanks very much for the ideas Ben and Extreme_Boky. First I'll start with trying out the simulation. Yes, Dennis, that was the simulator I found. It seems well regarded. My first endeavor will be to model my existing supply. I'll give it a go.

Regarding trying other diodes etc. At this particular point, I'd prefer not to swap out diodes. My goal is currently to see if adding inductance may not help my current supply. De-soldering heatsinks and replacing diodes or building a different type of supplies can come later.
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Old 30th November 2019, 10:52 PM   #1054
rsaumure is offline rsaumure  United States
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Its been a while since i posted anything in the forums - life just seems to get in the way. Anyway I have dusted off the projects I planned to start last year and am going back over the forums trying to re-edumacate myself. Believe me I have a long way to go. I am currently working on the F-5 and the power supply in particular. I am using the Amtek 4218 and plan on using the onboard rectifier circuits vs bridge rectifiers mounted to the chassis. And I am stuck on what components to use for the snubbers (input and output).

My understanding is that with the Antek 4218 the Cx is 3.3nF, Cs is 470nF and Rs is 16.9 ohms.

The parts I am considering for the input snubbers are (Mouser):

594-H332K39X7RL63J5R Ceramic Disc Capacitors .2LS 3300PF 500V 10%
81-RDEC71E476MWK1H3B Multilayer Ceramic Capacitor 47uF (but only rated to 25V - concerns me)
279-H416R9BZA Metal Film Resistors - Through Hole H4 16R9 0.1%

Do these look OK? These are not like the easiest components to find - unless its just do to my lack of experience.

For the output snubber, I understand that these may not be necessary would 605-RWHSE07TQ001R0FS Wirewound Resistors - Through Hole 1Ohms 3W 1% WW Axial be an appropriate choice coupled with a.1uF capacitor like 80-R82DC3100AA50J Film Capacitors Film Capacitors 63V 0.1uF 5% LS=5mm AEC-Q200?

Thanks for all your help - reading these forums and gleaning the amount of knowledge that is concentrated in one place is truely a humbling experience. Best regards.
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Old 2nd December 2019, 04:04 AM   #1055
Ben Mah is offline Ben Mah  Canada
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diyAudio Power Supply Circuit Board v3 illustrated build guide
Input and output snubbers - do you mean snubbers between the rectifiers and the first capacitors and snubbers after the final capacitors? If yes, then most diyAudio First Watt amplifier builders do not put them in their supplies. Note that the typical First Watt power supply does not include those snubbers.

As for the Quasimodo derived snubber between the transformer secondary and rectifiers, many builders, me included, do put those in. The values that you noted agree with the values shown here Quasimodo results (ONLY) in post #17. Mark Johnson recommends Epcos B32529 series metallized film capacitors and 0.5W metal film resistors.

B32529C0474J289 EPCOS / TDK | Mouser Canada

B32529C0332K189 EPCOS / TDK | Mouser Canada

For AC input safety capacitor:

ECQ-U2A332KL Panasonic | Mouser Canada
Attached Images
File Type: jpg F5PSUschematic.jpg (87.1 KB, 188 views)

Last edited by Ben Mah; 2nd December 2019 at 04:24 AM.
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Old 2nd December 2019, 03:11 PM   #1056
chuckd is offline chuckd  United States
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what grease is that and what is its purpose (i.e. "a little grease is helpful on the full pack devices" for the PSU - from Post #1)? thanks
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Old 2nd December 2019, 03:20 PM   #1057
rsaumure is offline rsaumure  United States
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Quote:
Originally Posted by Ben Mah View Post
Input and output snubbers - do you mean snubbers between the rectifiers and the first capacitors and snubbers after the final capacitors? If yes, then most diyAudio First Watt amplifier builders do not put them in their supplies. Note that the typical First Watt power supply does not include those snubbers.

As for the Quasimodo derived snubber between the transformer secondary and rectifiers, many builders, me included, do put those in. The values that you noted agree with the values shown here Quasimodo results (ONLY) in post #17. Mark Johnson recommends Epcos B32529 series metallized film capacitors and 0.5W metal film resistors.

B32529C0474J289 EPCOS / TDK | Mouser Canada

B32529C0332K189 EPCOS / TDK | Mouser Canada

For AC input safety capacitor:

ECQ-U2A332KL Panasonic | Mouser Canada
Ben,

Much thanks for your help on the snubber values and part numbers. I had literally stayed up all night reading and researching that information. There are lots of threads and I have only scratched the surface. That schematic is very helpful as well especially as I was trying to understand the placement of the cl60s as well.

Kudos!
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Old 2nd December 2019, 03:41 PM   #1058
rsaumure is offline rsaumure  United States
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Quote:
Originally Posted by Ben Mah View Post
Input and output snubbers - do you mean snubbers between the rectifiers and the first capacitors and snubbers after the final capacitors? If yes, then most diyAudio First Watt amplifier builders do not put them in their supplies. Note that the typical First Watt power supply does not include those snubbers.

As for the Quasimodo derived snubber between the transformer secondary and rectifiers, many builders, me included, do put those in. The values that you noted agree with the values shown here Quasimodo results (ONLY) in post #17. Mark Johnson recommends Epcos B32529 series metallized film capacitors and 0.5W metal film resistors.

B32529C0474J289 EPCOS / TDK | Mouser Canada

B32529C0332K189 EPCOS / TDK | Mouser Canada

For AC input safety capacitor:

ECQ-U2A332KL Panasonic | Mouser Canada
LOL - Just going back through my notes and at some point in the middle of the night I had found and printed that schematic - thinking "that would be really helpful". Oh well sometimes you have to walk away and clear your head. Thanks again!
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Old 2nd December 2019, 03:43 PM   #1059
JeffYoung is offline JeffYoung  Ireland
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diyAudio Power Supply Circuit Board v3 illustrated build guide
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Originally Posted by chuckd View Post
what grease is that and what is its purpose (i.e. "a little grease is helpful on the full pack devices" for the PSU - from Post #1)? thanks
The grease is a thermally conductive compound for filling any air gaps between the heatsink and the device. While they should both the dead-flat, they will still have microscopic roughness which would otherwise trap insulating air.
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Old 2nd December 2019, 03:43 PM   #1060
6L6 is offline 6L6  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
https://www.amazon.com/heaven2017-Co...PJNB78WPQFV2WD

That will last you forever. Use as little as possible.
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