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Old 17th June 2003, 11:07 AM   #11
trwh is offline trwh  United Kingdom
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Diode,

http://sound.westhost.com/project39.htm
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Old 17th June 2003, 11:10 AM   #12
trwh is offline trwh  United Kingdom
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You can see my implementation of this circuit here:

http://www.diyaudio.com/forums/showt...0187#post50187

Works well so far. I second EchoWars' recommendation to use a power resistor in stead of a MOV.

See ya,
Tim
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Old 17th June 2003, 11:15 AM   #13
trwh is offline trwh  United Kingdom
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Echowars,

Quote:
Huh? And the spike is smaller with no soft-start?? This sentence makes no sense...perhaps you would care to elaborate...
What Peranders said made sense to me. He is saying that the circuit that you posted will take an appreciable time to reset itself when the mains is disconnected. This delay means that in the event of a momentary mains power failure, the circuit may fail to reset and the soft start action would not be present. Other, more involved (active) circuits may have quicker reset times and hence avoid this problem.

Tim.
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Old 17th June 2003, 11:20 AM   #14
HighTec is offline HighTec  Croatia
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Yep,that's right trwh.
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Old 17th June 2003, 08:59 PM   #15
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Diode posted:
Quote:
I'm looking for a simple circuit that is reliable and places to get parts.
Emphasis mine. I tried to provide exactly what he asked for. Start planning for all contingencies and suddenly simplicity is out the window.

trwh, I like that circuit, and I may well use it on another project. But it is not exactly simple (but it is well done).

Edit: Certainly the power switch and bridge ought to be decent enough to be able to handle turn-on without the soft start, otherwise it is simply poor design. An occasional power dip resulting in the loss of mains voltage requiring the recharging of the bridge and filter caps should not be a problem, and if this is a frequent occurance, then you've got more problems than the need for a soft-start circuit...
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Old 18th June 2003, 12:52 AM   #16
Diode is offline Diode  United States
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WOW!

Thanks all for the information. I had seen the ESP design but wanted to see others and get different opinions. Yes, I have also seen to add a seperate power supply for the relay ckt. I will have a 12V PS for my speaker protector already so that's good!
The reason I mentioned MOVs was I worked for a power supply manufacturer and they used MOVs with a relay for their inrush ckt. Also Peavey uses MOVs on a big amp of theirs as well. I just haven't studied the circuit yet.

So many choices!!!! Jeez, next, I want to build a variable limiter.... I can't imagine how many different circuits there will be...

Keep the ideas coming if you wish. I use 120VAC in America though.........

Thanks to you all!

Chris
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Old 18th June 2003, 01:03 AM   #17
jleaman is offline jleaman  Belgium
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Who designed this.?
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Old 18th June 2003, 01:50 AM   #18
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matth,

can I use the Elektor soft start for 220VAC?

jojo
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Old 14th January 2013, 07:22 PM   #19
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Quote:
Originally Posted by HighTec View Post
And the PCB.

Bottom layer:
Wow, dangerous pcb. Creepage distance almost zero.
Old thread, I know.
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Old 14th January 2013, 07:38 PM   #20
HighTec is offline HighTec  Croatia
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Did you first remove the dust from this thread in order to post? Ok, that PCB was designed back in 2001. Anyways, if you apply the soldermask then there is no fear of jumping sparks between the copper traces. Well, I'm more mature now and my PCBs are more mature now as well.

Edit: the distance between traces was 30 mils. Maybe the low picture resolution makes it look closer.

Last edited by HighTec; 14th January 2013 at 07:42 PM.
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