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Power Supply Soft Start Board (V3)
Power Supply Soft Start Board (V3)
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Old 14th June 2020, 01:38 PM   #381
turion64 is offline turion64  United States
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Join Date: Mar 2019
Location: Trenton, NJ
Power Supply Soft Start Board (V3)
Quote:
Originally Posted by Dirk1 View Post
Hello everybody,
I have built the Soft Start Board for 230V.
Tested with 25V light bulb, did not light up.
C2 0.330F
C3 1500 F
R3-6 36 ohm for 200VA transformer
Relay does not pick up, LED does not light up.
Issue 8.89V Ac.
Relay coil 5V av 0V dc
Since I have a power switch before this board, I brought my mains directly into SW2 and Neutral. C1 becomes superfluous. Try mains directly into SW2 see what happens. Obviously have a fuse on the mains IEC before the circuit.
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Old 14th June 2020, 02:40 PM   #382
Dirk1 is offline Dirk1  Germany
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Join Date: Feb 2013
Location: Kassel
Thanks turion 64.
SW2 connected everything works.
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Old 14th June 2020, 03:06 PM   #383
turion64 is offline turion64  United States
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Join Date: Mar 2019
Location: Trenton, NJ
Power Supply Soft Start Board (V3)
Dirk: you needed to have a SPST switch in between SW1 & SW2. See page 13. It’s the older board but you can figure out the switch wiring onto the new board.

If you intend to go directly into SW2 remove C1 so there’s nothing flowing back into Live/SW1.

Pete

https://www.diyaudio.com/media/build...guide-v1.0.pdf
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Old 15th June 2020, 06:25 AM   #384
Dirk1 is offline Dirk1  Germany
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Hello Pete,
Thanks for the hint, use SW2 directly and remove C1.
At the weekend I will connect my PSU from the new BA3 Balanced and test it under load.
Dirk
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Old 27th June 2020, 06:07 PM   #385
alexya is offline alexya
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Join Date: Dec 2012
I saw that they are bigger projects, than I ask, for a simple amplifier, so I did it myself
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Old 25th July 2020, 10:02 PM   #386
booja30 is offline booja30  Spain
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Join Date: Feb 2020
Location: Valencia
I use this soft start in my F5 build, and I also have caps across the power switch terminals to extend the switch life (arc prevention).

Are these caps are still useful if using soft start? If not it would simplify the wiring quite a bit. If it's still recommended I'll leave it in.
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Old 20th October 2020, 10:47 AM   #387
myleftear is online now myleftear  Switzerland
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Power Supply Soft Start Board (V3)
Sorry, ignore
__________________
dobedobedo...
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Old 25th October 2020, 09:45 PM   #388
myleftear is online now myleftear  Switzerland
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Power Supply Soft Start Board (V3)
Default questions arise...

Hiya!
I was looking around for information about rectifiers (prasi!), softstart (Mark!) and did some research this weekend (surfing diyaudio instead of soldering, that is). Questions arose:

1) Should the capacitor-loading be specially addressed?
2) Bleeder resistors add hum? (*)

and, since I haven't yet digested all that,
3) Are these questions senseless?


*) I found an old thread, "Soft start circuit design and other psu issues", where AndrewT made a startling statement: Ouch.

Are them R9 R10? Is this something to take into consideration? (If a very slow cap-bleed after shutdown was acceptable...)
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Old 26th October 2020, 10:18 PM   #389
northox is offline northox
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Join Date: Jul 2020
Default 5W - Hot as hell

Hello guys, I built this circuit validated my wiring but the 5W resistors are becoming crazy hot . I made sure I have the right ones (5w wirewound 180R - white rectangle). I'm connected directly to SW2 so I removed C1. Other than this, it's all standard. The light comes on. The system works but it gets so hot I saw smoke coming out of those resistors.



Any idea what could be wrong?
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Old 27th October 2020, 06:57 AM   #390
mstomaso is offline mstomaso  United States
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This may have been covered before, if so I apologize.

Mouser says the relay 653-G5LA-14-CF-DC24 is discontinued. Is there a cross-referenced part?
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