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Old 27th February 2004, 08:51 AM   #1
Electrons are yellow and more is better!
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Default Sjöström Soft Start group buy

I have made my old (1989) soft starter in a updated version using LTSpice and this time Spice was very useful and accurate!

This soft start pcb isn't very advanced. It uses only common parts and no IC's but it has worked very good powering on a 600 VA /88000 uF PS since 1989, every day!

Wiki page here
http://www.diyaudio.com/wiki/index.p...F6m+Soft+Start

Click the image to open in full size.
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Old 27th February 2004, 06:46 PM   #2
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Default I'm in for three

I've used boards from Per-Anders before - top quality stuff.

Paul
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Old 27th February 2004, 07:29 PM   #3
cowanrg is offline cowanrg  United States
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i love the caution warning on the board, "do not touch anything"

makes it kinda hard to use eh?
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Old 27th February 2004, 07:53 PM   #4
hifi is offline hifi  Sweden
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yeah..it should read "bite me"
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Old 27th February 2004, 08:53 PM   #5
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Will this soft start be sufficient for a Aleph-x
500VA transformers/3x68000uF caps 21V
or will I have to use 2 (1 for each channel)

Ralph
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Old 28th February 2004, 08:04 AM   #6
Electrons are yellow and more is better!
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Quote:
Originally posted by cowanrg
i love the caution warning on the board, "do not touch anything"
.... when the power is switched on.

I'll guess you will learn that rather quickly

The main purpose of the circuit is to save the fuses in the house. As I wrote above, 600 VA have I used for years and started with a 5 watt resistor. A trick is not to have to long delay. It just warms up the resistor.
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Old 28th February 2004, 08:06 AM   #7
Electrons are yellow and more is better!
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Quote:
Originally posted by rwagter
Will this soft start be sufficient for a Aleph-x
500VA transformers/3x68000uF caps 21V
or will I have to use 2 (1 for each channel)
You will probably need only one but let me also say that if you don't have any problems with your fuses in the house you don't need this thing.
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Old 28th February 2004, 08:38 AM   #8
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Peranders,

How many orders will it take to get the price down below 30SEK?
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Old 28th February 2004, 12:24 PM   #9
Electrons are yellow and more is better!
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Quote:
Originally posted by roddyama
Peranders,

How many orders will it take to get the price down below 30SEK?
I think I must order > 150-200 boards but I haven't negotiated yet. I don't think it's impossible to get near 30 SEK. At the moment we have only 36 boards which aren't so much especially when they are so small.
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