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Old 31st December 2013, 02:27 PM   #11
clucka is offline clucka  United States
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Hi,
Will there be a build guide for V3? I have the boards and will be ordering parts. Would like to be aware of best practices around hooking up and turning on.

Thanks,
Curt
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Old 31st December 2013, 03:04 PM   #12
6L6 is offline 6L6  United States
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Yes, there will be a guide. I have the PCB, but haven't yet ordered parts. (I'm currently out of town, and in your neck of the woods for a few more days...)
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Old 3rd January 2014, 02:01 AM   #13
BigE is offline BigE  Canada
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Can this be converted to a slow cap charge circuit? or is that simpler? ie, an RC network with time constant selected to ensure that the relay's pull in voltage is created at a delayed time?
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Old 3rd January 2014, 03:37 AM   #14
6L6 is offline 6L6  United States
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That is the operation of the circuit.
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Old 4th January 2014, 11:44 AM   #15
BigE is offline BigE  Canada
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Thanks! It looks to me like one would change R19 and C10 for adjusting relay operation time, as well as R15-R18 to adjust power requirements.

Last edited by BigE; 4th January 2014 at 11:47 AM.
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Old 4th January 2014, 10:09 PM   #16
BigE is offline BigE  Canada
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Oops, not R19, R14! Must try LTspice....
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Old 7th January 2014, 03:51 PM   #17
BigE is offline BigE  Canada
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What is the maximum size toroid that can be started with this soft-start? I am a novice, looking at the relay spec sheet, trying to understand what are the limiting values....

http://www.components.omron.com/comp...5LA_E_0911.pdf

Any help is very appreciated, as I will need a soft-start for my toroid and also need speaker protection due to DC couple pre and amp.

Thanks!
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Old 7th January 2014, 04:07 PM   #18
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I have been running a 1kva toroid with a combined filter capacitance of about 160kuf for about 3 years now. All with the supplied values in the BOM.

Have you read the build guide? It should help you in fine tuning the soft start if needed.
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Old 7th January 2014, 04:21 PM   #19
BigE is offline BigE  Canada
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Yes, I have read the build guide, and it does say you can have some big toroids.

My toroid is a universal 2.4 kVA, with 5 60-0-60 outputs that can be wired to provide between 36 and 30 volts volts -- for a max of about 1.5 to 1.2 kVA.

This is going into a high bias F5T with 4 pairs of outputs per channel at about 45 volt rails. The bias current is limited by the heatsinking, which should manage around 3 amps per channel.

Yes, this toroid is stupidly oversized, but it is not great sounding as a balanced power source -- which was it's original purpose, and I want to reuse it... or sell it....

THANK YOU!!!
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Old 7th January 2014, 04:55 PM   #20
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Well I think for amp builders there is no such thing as oversized.

Iirc, the largest load I had used the parts values in the BOM is for a two-toroid setup that has a combined rating of about 2kva only. I never actually worried too much about the relay since once the caps have their initial charge, shorting out the limiting resistors wasn't much of a problem.

Loading lots of capacitance and the extra load of the amp may need you to adjust the values of the limiting resistors so they don't get too hot during power ups.

Fwiw, my CNC's motor psu also uses the same soft starat. With 3 hungry Kelling stepper motors that each draws out about 4A during hold modes also uses the same relay in the BOM.
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