1200V amplifier - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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 September 2005, 12:09 PM   #1
diyAudio Member
 
Join Date: Sep 2005
Send a message via AIM to Nightvision Send a message via MSN to Nightvision Send a message via Yahoo to Nightvision
Arrow 1200V amplifier

People,

I want to build a sor of amplifier which can make 0 to 1200V output out of 0 to 5V input (may also be inverted).

It has to be a lineair control. It also has to be in SMD. Many transistors or FETs can't go further than Vce and Vbe of 200/300V, so I have to make something which can handle the 1200V.

Anyone has an idea?! Thanks!

Martijn
  Reply With Quote
Old 1st September 2005, 12:33 PM   #2
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
good luck finding SMD resistors for KV operations. KV transformers are also special beasts -- once you go over 600V the wire and between-layer insulation becomes quite specialized and expensive. I don't know what the situation is on that side of the Atlantic, over here HV transformers are relatively easy to obtain from military surplus outlets and ham radio flea-markets.

in fact, one of the easiest ways of implementing this design is to regulate the primary side of a transformer, picking up the error signal from the secondary side -- think of it as a linear supply using switching power control loop principles. instead of controlling the duty cycle of a switch, control the amplitude of a primary side amplifier -- you can opto-couple the feedback control just as in a SMPS.
  Reply With Quote
Old 1st September 2005, 12:38 PM   #3
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
What power and bandwidth are you looking at ? Is it for driving a large ESL, a small piezo actuator, ..... ?

Regards

Charles
  Reply With Quote
Old 1st September 2005, 12:54 PM   #4
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally posted by jackinnj
good luck finding SMD resistors for KV operations. KV transformers are also special beasts -- once you go over 600V the wire and between-layer insulation becomes quite specialized and expensive. I don't know what the situation is on that side of the Atlantic, over here HV transformers are relatively easy to obtain from military surplus outlets and ham radio flea-markets.

in fact, one of the easiest ways of implementing this design is to regulate the primary side of a transformer, picking up the error signal from the secondary side -- think of it as a linear supply using switching power control loop principles. instead of controlling the duty cycle of a switch, control the amplitude of a primary side amplifier -- you can opto-couple the feedback control just as in a SMPS.


An easy way would be using a standard audio power amp and have it drive a step-up transformer that can handle the voltage levels. That gives you galvanic isolation, low price (an LM3886 would be great for this) and level control.

Jan Didden
__________________
I won't make the tactical error to try to dislodge with rational arguments a conviction that is beyond reason - Daniel Dennett
Check out Linear Audio Vol 7!
  Reply With Quote
Old 1st September 2005, 02:17 PM   #5
diyAudio Member
 
Hanzwillem's Avatar
 
Join Date: Nov 2002
Location: Hengelo, The Netherlands
Also, check out Apex microtech
http://eportal.apexmicrotech.com/mainsite/index.asp

They have some piezo drivers and stuff. Also some usefull articles on precautions using high voltage opamps.

succes.
__________________
They must have been holy chips or something - Pedro
  Reply With Quote
Old 1st September 2005, 02:23 PM   #6
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Just thought of something: this 1200V is that peak-to-peak or RMS or what? if it is p-p and balanced you can use a tube power amp and take the output from the primary of the output xformer.

Jan Didden
__________________
I won't make the tactical error to try to dislodge with rational arguments a conviction that is beyond reason - Daniel Dennett
Check out Linear Audio Vol 7!
  Reply With Quote
Old 1st September 2005, 02:29 PM   #7
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Quote:
Originally posted by janneman
Just thought of something: this 1200V is that peak-to-peak or RMS or what? if it is p-p and balanced you can use a tube power amp and take the output from the primary of the output xformer.

Jan Didden
that's what we used "in my youth" when doing Electron Spin Resonance experiments -- seems like a shame to have used a McIntosh amplifier, but what the heck, the U.S. Navy was paying for it.
  Reply With Quote
Old 1st September 2005, 03:21 PM   #8
EC8010 is offline EC8010  United Kingdom
diyAudio Moderator Emeritus
 
EC8010's Avatar
 
Join Date: Jan 2003
Location: Near London. UK
Quote:
Originally posted by jackinnj
that's what we used "in my youth" when doing Electron Spin Resonance experiments -- seems like a shame to have used a McIntosh amplifier, but what the heck, the U.S. Navy was paying for it.
Surely the amplifier found other uses when it was "off-duty"?
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
  Reply With Quote
Old 1st September 2005, 05:33 PM   #9
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally posted by jackinnj


that's what we used "in my youth" when doing Electron Spin Resonance experiments -- seems like a shame to have used a McIntosh amplifier, but what the heck, the U.S. Navy was paying for it.
My dissertation work involved the use of B&K 4003s to measure infrared spectra. For some reason or other, those mikes never seemd to be around unless I was physically in the lab.

Why was the Navy doing ESR?
__________________
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 1st September 2005, 06:28 PM   #10
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Quote:
Originally posted by SY
Why was the Navy doing ESR?
Re-run of the Philadelphia Experiment?
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  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
wtd: 2 x 1200v hexfreds or similar (UK) adamus Swap Meet 0 27th November 2008 06:17 PM
FS: Used Pair of 3.3uf/1200V Mundorf Silver in Oil capacitors nycavsr2000 Swap Meet 1 15th September 2007 01:47 AM
CREE 1200V 5A SiC diodes 5u4 Swap Meet 5 6th January 2007 08:13 PM
Wanted: DIY amplifier builder with experience. I need a 0.7 ohm stable amplifier Audiophilenoob Swap Meet 34 16th May 2005 11:58 PM
Who knows where to get 1200v Silicon Carbide Schottkys ? TugaTweaker Tubes / Valves 30 2nd September 2003 10:21 PM


New To Site? Need Help?

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