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Power Supply Soft Start Board (V3)
Power Supply Soft Start Board (V3)
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Old 14th February 2019, 07:03 PM   #301
astromo is offline astromo  Australia
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Join Date: Nov 2017
Location: BFN
Quote:
Originally Posted by kevinr View Post
Thanks for your post astromo .
I did read through those posts and links; but hobby wise at this stage I'm pretty much just a "parts changer" as they say.


Is a SMPS an option to power the Soft Start board ?

If you're a "parts changer" then it sounds like a ready made power supply would be more appropriate for you. To reiterate, this board is powered directly from the AC mains and is relevant to a transformer of a size of your choosing (subject to the guidance previously referred to) that is located downstream of the board.


If you opt for an SMPS, then inrush should be effectively dealt with and this board would be unnecessary (happy to be corrected by those with more knowledge). That's one of the reasons I'd expect that an SMPS PSU philosophy was chosen by Nelson Pass for the ACA. It avoids a lot of issues there by making it simple and easy AND because it supplies 19/24 VDC, the safety concerns of an AC mains is largely designed out.


I'm not sure you've got the fundamentals of this piece of kit bedded down (not that I think I have totally myself but I'm sure I'll give it another read or two before I do the final wire up). The write up in the guide that I linked to above provides a well reasoned and explained narrative. Very helpful and worthwhile.
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Old 14th February 2019, 08:50 PM   #302
kevinr is offline kevinr  United States
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Join Date: Jun 2009
Quote:
this board is powered directly from the AC mains
Okay , I understand now astromo . Can't put the soft start board after the amplifier .
Initially when I read ( i.e. googled ) about speaker protection for my high efficiency full range speakers I was thinking of using a fuse. Then search results said fuses are used for tweeters .
So that's when the diyaudio store page with the soft start pcb appeared in my search results . I thought it might be an option.
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Old 14th February 2019, 09:11 PM   #303
astromo is offline astromo  Australia
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Join Date: Nov 2017
Location: BFN
No worries.

You were sent to the right place on the store. The thing is that, that one page covers two separate boards.

One for AC in-rush, i.e. soft start, and the other for speaker protection.

You've simply picked the wrong thread.

Take a closer look and it should self reveal.

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Old 14th February 2019, 09:28 PM   #304
mrdave45 is offline mrdave45  United Kingdom
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Join Date: Oct 2010
Location: Kent
I think its also worth noting the speaker protect board can be powered from the +24v rail from the standard diyaudio psu
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Old 15th February 2019, 01:10 PM   #305
kevinr is offline kevinr  United States
diyAudio Member
 
Join Date: Jun 2009
Quote:
You were sent to the right place on the store. The thing is that, that one page covers two separate boards.

One for AC in-rush, i.e. soft start, and the other for speaker protection.

You've simply picked the wrong thread.

Take a closer look and it should self reveal.
Many thanks astromo, and apologies to the moderator
I have vision issues using a 9 inch tablet and type font size 1 with tri-focals..... Well , that and a need to read more carefully .
My Windows machine retired itself and the family are usually streaming movies on my Mac.

I needed to scroll down the screen page all the way , I was focusing on the Ver 1 2 and 3 links .
On the proper speaker protection circuit thread a poster lists a transformer part number at Mouser for the PCB on the last page.
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