Is this an unrealistic choice to power an ESL? - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

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 23rd July 2011, 01:46 AM   #1
diyAudio Member
 
Join Date: Sep 2010
Default Is this an unrealistic choice to power an ESL?

EMCO seems to have seveal possibilities which may be an ideal compact power supply...they seem to have a new small power supply that is tiny however, I dont know if it is capible of withstanding 2kv for several hours. Is there a min or max ma bias current that is ideal?

I know CharlieM mentioned the G model but, If i could get away with this tiny model........

http://emcohighvoltage.com/pdfs/aseries.pdf

Thanks,
Jerry
  Reply With Quote
Old 23rd July 2011, 04:37 AM   #2
diyAudio Member
 
Join Date: Feb 2008
Location: Jackson,michigan
I had been looking at those for quite some time,But someone had mentioned that they are very costly and it is hard to find a vender,
It would defintely work though,I think think they have a model that is variable as well,which was the one I was looking at like 0v to 5kv or 6kv.
It has been awhile since I have seen any recent data sheets.


jer
  Reply With Quote
Old 23rd July 2011, 08:36 AM   #3
Calvin is offline Calvin  Germany
diyAudio Member
 
Calvin's Avatar
 
Join Date: Nov 2004
Location: close to Basel
Hi,

while I had some good experiences with larger EMCO models, I found them quite expensive and not easy to source.
With the A-series I fear that they will be very costly because of their tiny size, not because of their performance. They should generally be usable in this application, but Id worry about their low regulation factor. A 100% to 200% difference between no-load and full-load condition will become problematic, since small differences in leakage of the panels may lead to widely varying membrane bias voltage. Itll also be a bit more difficult to find the right bias point, since the supply tends to run away. Id rather look for a dc-dc-converter with better output regulation.
I use supplies similar to the G30 in a shielded version with a load regulation of <10% (similar as G30) and just 10% of the specced ripple of the G.

jauu
Calvin
  Reply With Quote
Old 23rd July 2011, 10:12 AM   #4
diyAudio Member
 
alexberg's Avatar
 
Join Date: Oct 2009
Taking into account time and money involved into ESL I would look for noting less than PMT HV power supply.
Matsuada, Spellman, Hammamatsu to name a few...
  Reply With Quote
Old 25th July 2011, 06:11 PM   #5
diyAudio Member
 
bolserst's Avatar
 
Join Date: Jun 2005
Location: Fort Worth, Texas
Quote:
Originally Posted by Calvin View Post
while I had some good experiences with larger EMCO models, I found them quite expensive and not easy to source.
With the A-series I fear that they will be very costly because of their tiny size, not because of their performance. They should generally be usable in this application, but Id worry about their low regulation factor. A 100% to 200% difference between no-load and full-load condition will become problematic, since small differences in leakage of the panels may lead to widely varying membrane bias voltage. Itll also be a bit more difficult to find the right bias point, since the supply tends to run away. Id rather look for a dc-dc-converter with better output regulation.
I use supplies similar to the G30 in a shielded version with a load regulation of <10% (similar as G30) and just 10% of the specced ripple of the G.
Hello Calvin,

I agree that the EMCO products are quite costly compared to a typical DIY HV supply made using a 60Hz voltage multiplier.

Can you describe what you mean by the supply tending to "run away"?
Makes it sound like the HV keeps floating up higher and higher if minimal current is being drawn. Is this the case? Do they need a minimum load being drawn to supply a stable voltage like older switch mode computer power supplies?


Concerning Load Regulation:
Obviously it would be nice to have a solid load regulated HV source, but it may not be as advantageous as one might think for ESLs.

Most people run their ESLs in constant charge mode and connect the HV to the diaphragm thru a large series resistance typically of 50Mohm or larger. This being the case, wouldn't the load regulation of the supply be secondary to the voltage drop across the series resistance if some leakage developed in a panel? For example, with only 50uA of leakage, a 50Mohm resistor would drop the HV reaching the panel by 2.5kV.

Basically, the large series resistance keeps you from being able to take full advantage of a load regulated supply.
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Core choice for power transformer Joshua_G Power Supplies 15 23rd December 2010 09:19 AM
Power XFMR Choice sherpa Tubelab 3 18th October 2010 10:05 AM
Is it the good choice - power supply johnny52 Solid State 3 10th January 2008 12:22 AM
Best choice for Adcom Power Amp? GCD750 Solid State 1 21st June 2007 07:34 PM


New To Site? Need Help?

All times are GMT. The time now is 03:28 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