Power amp with current output, F1 competitor (kidding) - 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 25th September 2007, 08:09 AM   #1
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Default Power amp with current output, F1 competitor (kidding)

Guys,

I have taken note of the F1 popularity. If anyone of you wanted to play with current output amplifier, here is the circuit hint. It is up to you to calculate part values .

Best,
Pavel
Attached Images
File Type: gif f1compet.gif (9.9 KB, 628 views)
  Reply With Quote
Old 25th September 2007, 08:17 AM   #2
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default I have tried once...but i had problems with off set.


Please, instruct us how to control the off set and suggest some values to this schematic.

Was one schematic that our forum friend Ostry provided me and i could not control the off set...not exactly this one you suggest..but alike related the topology.

regards,

Carlos
__________________
This Sunday assemble a toy amplifier....a good fun to your weekend; https://www.youtube.com/watch?v=yk0qvkwsAOY
  Reply With Quote
Old 25th September 2007, 08:20 AM   #3
Vix is offline Vix  Yugoslavia
diyAudio Member
 
Vix's Avatar
 
Join Date: Nov 2003
Location: Somewhere on Planet Earth
And where is the nice paper, with all the explanations?
  Reply With Quote
Old 25th September 2007, 08:30 AM   #4
Ipanema is offline Ipanema  Malaysia
diyAudio Member
 
Ipanema's Avatar
 
Join Date: Jun 2004
Location: KL
Quote:
control the off set
You might want to use a DC servo.
  Reply With Quote
Old 25th September 2007, 09:06 AM   #5
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Hi Carlos,

yes, the DC offset depends on sameness of N and P halves. It is not that bad, though, even with change of

temperature. In case you disconnect the load, the DC increases substantially. Also, for higher ohm load the DC

increases. And gain increases with load, this is a current output amplifier.

The DC servo injecting current into input node would be the cure, as Ipanema has mentioned

Best,
Pavel
  Reply With Quote
Old 25th September 2007, 10:36 AM   #6
DarkOne is offline DarkOne  Slovakia
diyAudio Member
 
DarkOne's Avatar
 
Join Date: Oct 2001
Location: Bratislava
You should also move resistors from drain of output transistors to their source to improve linearity.
__________________
Regards
Robo
  Reply With Quote
Old 25th September 2007, 10:42 AM   #7
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
No, unless you want the amplifier to blow.

And distortion s HIGHER with resistors moved into sources!!
  Reply With Quote
Old 25th September 2007, 11:48 AM   #8
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Hereby something with component values. Iddle current is 1.5A. Transadmitance is about 0.725A output current to 1V input voltage difference (0.725A/V).
Attached Images
File Type: gif f1compet_val1.gif (14.2 KB, 514 views)
  Reply With Quote
Old 25th September 2007, 12:16 PM   #9
PMA is offline PMA  Europe
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
+ DC offset compensation
Attached Images
File Type: gif f1compet_val2.gif (14.8 KB, 496 views)
  Reply With Quote
Old 25th September 2007, 01:58 PM   #10
diyAudio Moderator Emeritus
 
lumanauw's Avatar
 
Join Date: Oct 2002
Location: Bandung
Send a message via Yahoo to lumanauw
Quote:
No, unless you want the amplifier to blow.
Why is that?
  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
Output transformer current and power ratings boywonder Tubes / Valves 3 29th April 2009 09:00 PM
Fullrange, are you guys kidding yourselves? cirrus18 Full Range 290 30th December 2008 06:07 AM
Is this a competitor? dshoaf Pass Labs 13 29th May 2005 08:32 PM


New To Site? Need Help?

All times are GMT. The time now is 12:24 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