Post your Solid State pics here. - Page 203 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th October 2011, 12:34 PM   #2021
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
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.
__________________
regards Andrew T.
  Reply With Quote
Old 17th October 2011, 12:39 PM   #2022
Account disabled at member's request
 
Join Date: Jul 2009




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.
  Reply With Quote
Old 17th October 2011, 12:58 PM   #2023
Account disabled at member's request
 
Join Date: Jul 2009
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.
  Reply With Quote
Old 17th October 2011, 01:03 PM   #2024
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Alex, is this circuit followed or proceeded by a transformer? It's not shown in the schematic.
  Reply With Quote
Old 17th October 2011, 01:17 PM   #2025
Account disabled at member's request
 
Join Date: Jul 2009
No transformer.
  Reply With Quote
Old 17th October 2011, 01:23 PM   #2026
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
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.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 17th October 2011, 01:24 PM   #2027
Account disabled at member's request
 
Join Date: Jul 2009
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..
  Reply With Quote
Old 17th October 2011, 01:26 PM   #2028
Account disabled at member's request
 
Join Date: Jul 2009
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
  Reply With Quote
Old 17th October 2011, 01:49 PM   #2029
dadod is online now dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Quote:
Originally Posted by Alexontherocks View Post
No transformer.
Of cource there is a transformer connected to J4.
  Reply With Quote
Old 17th October 2011, 03:41 PM   #2030
diyAudio Member
 
FastEddy's Avatar
 
Join Date: Jun 2006
Location: North Californie
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.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 11:10 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2