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Old 17th October 2011, 12:34 PM   #2021
AndrewT is offline AndrewT  Scotland
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post reported.

Alex, the schematic you have posted cannot possibly be built as you have shown.
There is some serious error in the schematic, that you appear to be unaware of.
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Old 17th October 2011, 12:39 PM   #2022
Alexontherocks is offline Alexontherocks  Italy
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OK so it should not work and it is unsafe.


Interestingly enough I was provided with the bare PCB of this finished product

Link to softstart board removed by moderation

Built 4, tested them with all sorts of toroid combinations and have worked fine ever since.
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Old 17th October 2011, 12:58 PM   #2023
Alexontherocks is offline Alexontherocks  Italy
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and by the way....regarding the problems you pointed out:

Sure the pcb is not isolated but it is possibile to obtain a DC tension without a transformer as long as the current absorbed is small. The pcb uses reactive capacitance to create the DC current.

the IDEC RU2S-A220 suggested for the build and visibile in the photographs is a relay driven with 220v.

The IDEC Ru2s-D24 is the second relay suggested and both offer interesting features such as a built in LED, a test function and are best mounted using a specific socket which helps in case of failures.

In regards to the NTC thermistors. I honestly don't seen a problem. IF two NTC 10D-20 are adequate for inrush currents to the toroid then what might happen with 2 groups in parallel would be for either one or the other to drop resistance and channel the surge current (thus leaving one group non functional given the resistance differential). If continuity across one branch is lost then the second would work as a failsafe.

If you see anything wrong with all of this please tell me.

Last edited by Alexontherocks; 17th October 2011 at 01:17 PM.
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Old 17th October 2011, 01:03 PM   #2024
Pano is offline Pano  United States
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Post your Solid State pics here.
Alex, is this circuit followed or proceeded by a transformer? It's not shown in the schematic.
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Old 17th October 2011, 01:17 PM   #2025
Alexontherocks is offline Alexontherocks  Italy
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No transformer.
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Old 17th October 2011, 01:23 PM   #2026
SY is offline SY  United States
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Post your Solid State pics here.
Quote:
Originally Posted by Alexontherocks View Post
No transformer.
That's VERY unsafe. So unsafe that we have only ONE rule regarding technical censorship on this forum: NO direct mains-powered circuits.

Use an isolation transformer and make sure that your chassis is tightly connected to earth ground. Otherwise, you're risking your own life and that of innocent family, friends, and kids who could get electrocuted from a simple fault that (in a safe build) would blow fuses.
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Old 17th October 2011, 01:24 PM   #2027
Alexontherocks is offline Alexontherocks  Italy
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However setting AndrewT's bashing aside....the circuit does contain a mistake. Infact 2x 0,33f MKP 275 entrance capacitors are missing... I will post the correct schematic in a moment..
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Old 17th October 2011, 01:26 PM   #2028
Alexontherocks is offline Alexontherocks  Italy
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Quote:
Originally Posted by SY View Post
That's VERY unsafe. So unsafe that we have only ONE rule regarding technical censorship on this forum: NO direct mains-powered circuits.

Use an isolation transformer and make sure that your chassis is tightly connected to earth ground. Otherwise, you're risking your own life and that of innocent family, friends, and kids who could get electrocuted from a simple fault that (in a safe build) would blow fuses.

I understand....then please delete my posts
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Old 17th October 2011, 01:49 PM   #2029
dadod is online now dadod  Croatia
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Quote:
Originally Posted by Alexontherocks View Post
No transformer.
Of cource there is a transformer connected to J4.
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Old 17th October 2011, 03:41 PM   #2030
FastEddy is offline FastEddy  United States
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Quote:
Originally Posted by SY View Post
That's VERY unsafe. So unsafe that we have only ONE rule regarding technical censorship on this forum: NO direct mains-powered circuits.

Use an isolation transformer and make sure that your chassis is tightly connected to earth ground. Otherwise, you're risking your own life and that of innocent family, friends, and kids who could get electrocuted from a simple fault that (in a safe build) would blow fuses.
Yes! ... So unsafe that insurance companies have been able to block payments for fire liability, in many states ... If you burn your own house down, insurance companies may not be obligated to pay. If you burn your apartment building down, you could go to jail and be liable for all of the damage and injury.
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