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star A.C. Devices
star A.C. EMI Filter
star A.C. Spectrum
star Digital Oscilloscope
star Flat Top A.C.
star Isolation Transformer - Safer Power Supply ?
star Isolation Transformer
star MCB - For Testing
star Relay - Power Failure Manual Reconnection System
star Soft Start Circuit
star Soft Start Circuit 2
star Tube Amplifier
5Z3P, 6N9P, EL34
 

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star AWG Vs mm
 

My AV System

star System Info.
star Testing Result 2016-5-14
star Testing Result 2014-7-27
   

Case Opening

star Cambridge Audio
CA 351C
star KEF Q300 Speaker
   

Unboxing

star 5z3p 6n9p EL34
Tube Amplifier DIY kit
star AudioQuest USB A-B Forest 1.5m
star B&W 685 S2 speaker
star WireWorld RCA Luna 7 1m
   

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star Medeco Lock Replacement
   

 

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Soft Start Circuit

Soft start circuit board
Soft Start Circuit

RMB $60

http://item.taobao.com/item.htm?spm=a1z09.2.9.327.YUdq10&id=13046387336&_u=qran1oof9f6

First the current will go through the capacitors on the lower right corner.

At last, the current will only pass through the biggest Blue Relay.

The Soft Start Circuit Board can reduce the starting current of the Inductor, Motor, Transformer which the initial resistances are very small. A small resistance causes large current (Inrush Current) and causes problems -

  • MCB trips when start up

  • Reduce the life of switch

  • EMI comes out

The following demonstration is very dangerous because of LIVE electricity !!!

output of soft start circuit The output of the Soft Start Circuit Board BEFORE plugging into the 13A socket ... ... strange !!!
The output of the Soft Start Circuit Board AFTER plugging into the 13A socket BUT the 13A socket is not switched on.
The output of the Soft Start Circuit Board AFTER plugging into the 13A socket and the 13A socket is switched on. BUT the Soft Start Circuit Board is not switched on.
The Soft Start Circuit Board is switched on
I found that the Soft Start Circuit Board may be interfered by the AC and the capacitors stored energy; therefore, there is output signal even the power is not switched on.