Help with HV DC Power Supply - 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 1st February 2006, 04:29 PM   #1
furly is offline furly  Canada
diyAudio Member
 
Join Date: Jul 2005
Location: Calgary, AB.
Send a message via MSN to furly
Default Help with HV DC Power Supply

Does anyone know anything about these photocopier HV power supplies? Has anyone successfully used one?

I have 2 on hand a pin out for only 1 of them. I tried to get it working using a simple voltage divider to measure its ouput, but i could not get it working. I am thinking it may need a certain load to operate correctly.

They both take a 24V DC input and have several outputs including 6.3KV, but they do not say wether or not this output is AC or DC. Not hard to figure out using a scope but i can't get anything out of the one i tried to use.

I also have a simple power supply that outputs 300V DC but stepping it up seems to be more trouble then its worth.

Any thoughts?

thanks,
furly
  Reply With Quote
Old 1st February 2006, 10:49 PM   #2
diyAudio Member
 
I_Forgot's Avatar
 
Join Date: Jan 2005
Location: Phoenix, Az.
They are usually DC. Pinouts are all proprietary- i.e. there is no standard.

Those supplies are usually only good for a few tens to hundreds uA out. Your resistive divider may be killing the output. You need a very high resistance divider. Try a 10M and a 1M resistor in series. When you measure the voltage don't forget to factor your meter's resistance in Total R = 1M (resistor) || 10M (typical meter) + 10M (resistor)

Expect >600V, so if your meter can't handle it, use 20M in series with 1M to drop the voltage. You should probably try to use HV resistors, but if you don't have them (who does?), off the shelf parts should work get you results that are close enough.

I_F
  Reply With Quote
Old 1st February 2006, 11:15 PM   #3
furly is offline furly  Canada
diyAudio Member
 
Join Date: Jul 2005
Location: Calgary, AB.
Send a message via MSN to furly
Yeah this supply is rated at 800uA max at 6.3 KV.

I was using lower values in my divider (100K & 100), so yes, I guess it could not supply enough current. When I hooked it up to the scope, the signal was all noise which shows something like this was probably the case.

I will give the higher resistors a try and hopefully that will solve the problem. I don't have any HV resistors but given the low amount of current it should be ok, at least for a test run.

Also, interesting point on the meter. I have never considered taking into account its resistance even though it will be practically negligible.
  Reply With Quote
Old 2nd February 2006, 12:04 PM   #4
diyAudio Member
 
I_Forgot's Avatar
 
Join Date: Jan 2005
Location: Phoenix, Az.
The meter resistance is usually negligible, but when measuring very high resistance sources you have to consider it.

If you measure voltage across a 1K resistor, the total resistance becomes 1K||10M which is essentially 1K. Measure voltage across a 10M resistor with a 10M meter and the resistance becomes 10M||10M= 5M. Your measurement will be off quite a bit if you don't take the meter resistance into account.

I_F
  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
Split Voltage Switching Power Supply for Power Amp vectorplane Swap Meet 2 23rd April 2011 11:48 PM
LTspice tool for power amp power supply component evaluation andy_c Software Tools 2 23rd August 2009 05:10 PM
Can i use a computer power supply to power audio amplifiers? destroyer X Solid State 91 25th September 2006 04:36 AM
selling high current power supply for power amps. ericpeters Swap Meet 0 14th January 2005 02:21 PM
heater supply (xformer specs are 6.3V 2.5A) as supply for a power LED? jarthel Tubes / Valves 10 21st July 2003 01:30 PM


New To Site? Need Help?

All times are GMT. The time now is 11:29 PM.


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