Help the Apex 550W Class-B?! - 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 9th July 2011, 06:09 AM   #1
radio is offline radio  Macedonia
Banned
 
Join Date: Oct 2009
Location: Bitola MACEDONIA
Default Help the Apex 550W Class-B?!

Hello all!
I want this amplifier 550W class-B to be processed into kalass-AB, and instead of diodes D3 (1N4148) and D4 (1N4148) for the bias, to put the transistor for bias, ... such as BD139 or similar?
That's why people help you do that changes the pattern of this amplifier?
thanks
Attached Files
File Type: pdf Apex 550W class-B.pdf (169.3 KB, 352 views)

Last edited by radio; 9th July 2011 at 06:13 AM.
  Reply With Quote
Old 9th July 2011, 11:33 AM   #2
NMOS is offline NMOS  Germany
diyAudio Member
 
NMOS's Avatar
 
Join Date: Dec 2010
Location: Frankfurt
Quote:
Originally Posted by radio View Post
Hello all!
I want this amplifier 550W class-B to be processed into kalass-AB, and instead of diodes D3 (1N4148) and D4 (1N4148) for the bias, to put the transistor for bias, ... such as BD139 or similar?
That's why people help you do that changes the pattern of this amplifier?
thanks
please check amplifier basics knowledge....

this amp is working in class AB

but you can add class AB +B for more output power
  Reply With Quote
Old 9th July 2011, 01:44 PM   #3
Banned
 
Join Date: Jan 2005
Just replace the diodes with a VBE multipler, its really that simple.
  Reply With Quote
Old 9th July 2011, 05:07 PM   #4
radio is offline radio  Macedonia
Banned
 
Join Date: Oct 2009
Location: Bitola MACEDONIA
Quote:
Originally Posted by NMOS View Post
please check amplifier basics knowledge....

this amp is working in class AB

but you can add class AB +B for more output power
Mr. Mile Slavković said two diodes (2x1N4148) the amplifier operates in class-B (see the schematic as written on the top left?)
Cheers
  Reply With Quote
Old 9th July 2011, 05:09 PM   #5
radio is offline radio  Macedonia
Banned
 
Join Date: Oct 2009
Location: Bitola MACEDONIA
Quote:
Originally Posted by Tekko View Post
Just replace the diodes with a VBE multipler, its really that simple.
He prayed to the school to circuit (schematic)!
thanks
  Reply With Quote
Old 9th July 2011, 07:27 PM   #6
Banned
 
Join Date: Jan 2005
its simple, a resistor from C to B about 1k and a 1k pot in series with a 220-500 ohm resistor between B and E. and a cap between C and E.

Adjust pot for around 50-75mA per output pair.
  Reply With Quote
Old 9th July 2011, 07:59 PM   #7
radio is offline radio  Macedonia
Banned
 
Join Date: Oct 2009
Location: Bitola MACEDONIA
Quote:
Originally Posted by Tekko View Post
its simple, a resistor from C to B about 1k and a 1k pot in series with a 220-500 ohm resistor between B and E. and a cap between C and E.

Adjust pot for around 50-75mA per output pair.
Thanks and cheers !!
  Reply With Quote
Old 10th July 2011, 01:43 PM   #8
radio is offline radio  Macedonia
Banned
 
Join Date: Oct 2009
Location: Bitola MACEDONIA
Quote:
Originally Posted by Tekko View Post
its simple, a resistor from C to B about 1k and a 1k pot in series with a 220-500 ohm resistor between B and E. and a cap between C and E.

Adjust pot for around 50-75mA per output pair.
Here's eating shematic (Figure 1) and thus it must be connected transistor BD139!
thanks
Attached Files
File Type: pdf Figure 1 (klass-AB 500W Amplifier).pdf (70.0 KB, 210 views)
  Reply With Quote
Old 10th July 2011, 02:15 PM   #9
Banned
 
Join Date: Jan 2005
Yeh thats it, just needs atleast 5 pairs of outputs and around 55-75V rails for 500 watts in 4 ohms.
  Reply With Quote
Old 12th July 2011, 09:06 AM   #10
radio is offline radio  Macedonia
Banned
 
Join Date: Oct 2009
Location: Bitola MACEDONIA
OK! Tekko

Hello all!
I need a PCB for this circuit? (500W class-AB audio amplifier!!!)
thanks

Last edited by radio; 12th July 2011 at 09:09 AM.
  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
which apex 550w pcb layout is better? wattaniya Solid State 1 12th December 2010 01:19 PM
Some thing to look over Apex 45 w Class AB colin.hepburn2 Solid State 0 7th November 2004 11:54 PM
apex opamps tubedude63 Chip Amps 3 19th February 2004 05:09 AM
Apex Cascode Class a Amp Cd colin.hepburn2 Solid State 0 19th May 2003 02:25 AM


New To Site? Need Help?

All times are GMT. The time now is 09:07 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