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diyAudio Power Supply Circuit Board v3 illustrated build guide
diyAudio Power Supply Circuit Board v3 illustrated build guide
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Old 19th October 2017, 09:03 AM   #611
mrdave45 is offline mrdave45  United Kingdom
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Location: Kent
I'm scratching my head a bit here. If my cap has an esr of 22mohm, does that really mean that with a 24v rail it will try to draw at 1091A until its charged? Presumably here, the dc resistance of the secondary would actually limit this. I suspect that this is actually quite a complex thing to work out as there's so much changing at power up.
What happens on the secondary as you turn on and get the massive current on the primary before the fields have stabilised?
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Old 19th October 2017, 09:07 AM   #612
AndrewT is offline AndrewT  Scotland
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10ohms of soft start has very little effect on a 240Vac mains supply.
The peak starting current could be as high as 240Vac/10ohms = 24Aac or 340Vpk/10ohms = 34Apk
The CL60 works well for 110/120Vac mains supplies, but expect at least double that for the harmonised mains supplies on this side of the Atlantic.
I typically use between 30ohms (1000VA) and 140ohms (160VA) as soft start depending on transformer VA & type.
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Old 19th October 2017, 09:11 AM   #613
AndrewT is offline AndrewT  Scotland
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The Power Thermistor manufacturers publish application notes describing the method of determining the Thermistor resistance value and Power rating for combinations of voltage and capacitance. All of these slow charging Power Thermistors are in the capacitor circuit.
I don't believe that placing the Power thermistor on the primary side with the capacitance on the secondary side behaves as required by the manufacturers' method.

I have never seen a app note example for a slow charge circuit separated from it's capacitance by a mains transformer. I too am not man enough to think through the modelling required to predict how this behaves.
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Old 9th November 2017, 07:08 AM   #614
reddish75 is offline reddish75  United Kingdom
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Could anyone tell me the lengthy of the capacitor part to the pcb without the rectifier part?

Thanks
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Old 9th November 2017, 12:35 PM   #615
reedcat is offline reedcat  United States
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Quote:
Originally Posted by reddish75 View Post
Could anyone tell me the lengthy of the capacitor part to the pcb without the rectifier part?
Capacitor PCB sections are 119mm x 78mm, rectifier PCB are 52mm by 78mm each. All dimensions are here
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Old 25th November 2017, 02:31 PM   #616
rock12 is offline rock12  United States
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Building the honey badger amp with this power supply any suggestions on parts
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Old 9th January 2018, 07:13 PM   #617
Zapped is offline Zapped
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Join Date: Jul 2002
Location: Seattle
I have a bunch of these AC interference caps, but their capacitance is a bit higher than the .0033 microfarad units recommended for the general power supply, and they are polypropylene instead of ceramic. Can I use them in the 110 volt power supply for my F5? These X2 units are rated at 275 vac

https://www.conrad.com/medias/global...B.EPS_1000.jpg


Thank you for any guidance you can give.

Larry Wright
"Zapped" (but looking to avoid the situation in the future)

(I tried to directly post the photo here but it did not seem to paste in properly. Maybe too high a resolution of the photo. Dunno)
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Old 10th January 2018, 08:27 AM   #618
AndrewT is offline AndrewT  Scotland
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X2 capacitors are suitable for direct connection from Live to Neutral of mains supplies upto 250Vac.

Check the pixel size and the file size/type.
If needed crop the pic to show what we NEED to see. If needed resize to a resolution that we NEED to see the detail required. I use Irfanview.
Attach pics using the Forum's procedure.
How to attach images to your posts.
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Old 10th January 2018, 07:52 PM   #619
Zapped is offline Zapped
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Thank you very much for the information, Andrew.

Larry Wright
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Old 30th January 2018, 02:32 AM   #620
Roo2 is offline Roo2  Australia
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Hi all. I've one of these excellent looking PCB's coming my way with a set of AlephJ class A amplifier PCBs and matched mosfets, jfets.
This will be my first amplifier build. I'm a mech eng with only a bit of electrical/electronics knowledge so need a bit of your practical advice wrt parts selection. I'm trying to learn more so if you can provide a bit more than yes/no answers to my questions below that will be really appreciated.
I'd like to be a bit future proof with my PSU. Build it so I can try different class A amplifier cards down the track (around the same 25W rating).
1. Is there any benefit or need for me to add some of the optional 0.47R PI resistors for the AlephJ?
2. Based on my reading through this thread so far, input and output snubbers appear unnecessary for a class A amp in the first instance. I assume this could be added later if noise becomes apparent?
3. I'd like some capacitor make/model recommendations please... I realise this question is a bit of a can of worms I think using 8 x 15kuF caps will be more than I'm likely to need? Will 25V rating cover me or should I go for 50V caps to cover other ~25W Pass amp options? Happy to pay a small premium for longer life. Happy to pay a small premium for "better sounding" audio grade but I'm not sure if I'll be able to hear the differences. ie. Looking for good sound, good life, good value.
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