Zca ....turbo - 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 10th April 2010, 01:33 PM   #1
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
Default Zca ....turbo

here we go ...

what is going to happen if we make a ZCA as seen from mark houston but instead one transitor make three for example very carefully matched and three load resistors or othetr type of load and increase the rail voltage ????

probably that will increase the power

what about the rest ???

something like that
Attached Images
File Type: png ZCA TURBO !!!.PNG (6.4 KB, 145 views)
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 10th April 2010, 01:41 PM   #2
diyAudio Member
 
event horizon's Avatar
 
Join Date: Feb 2008
Location: East Midlands, England
The important thing to do would be fit low value source resistors so that the fets are not left to there own devices, this will force them to match much like emitter resistors would on a transistor.

You'd not need precisely 3 load resistors but a serious increase in power dissipation from the upper load resistor (though 3 in parallel does make some sense ).
__________________
"Never let your morals prevent you from doing what is right!" Salvor Hardin
  Reply With Quote
Old 10th April 2010, 01:51 PM   #3
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
ha ha ha ...ok points taken

probably with this to produce 2x15W you will toast arround 150 per chanel ... not very echo ...the question is theoretical ...

then the question is if worth listening to
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 10th April 2010, 01:59 PM   #4
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
There s no way producing 15W of audio power from a
24V supply, unless the load is low impedance, but then,
there will be incredibly high thermal dissipation,
not counting a huge THD ratio, since these kind
of amps should rather be called Turbo Distorsion..
  Reply With Quote
Old 10th April 2010, 02:02 PM   #5
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
HMMM this is what i thought also .... but as i said this is all hypothetical ... i listen music atleast 15 hours a day so there is no question running an amp of this consumption for all day use ....

hei wahab !!! thanks for join in ... ( by the way very nice music !!!!! ) well done !!! i took a look at your web
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 10th April 2010, 02:29 PM   #6
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by sakis View Post
HMMM this is what i thought also .... but as i said this is all hypothetical ... i listen music atleast 15 hours a day so there is no question running an amp of this consumption for all day use ....

hei wahab !!! thanks for join in ... ( by the way very nice music !!!!! ) well done !!! i took a look at your web
Thank you, Sakis,

I also run an amp all day long, if not 24/7, it s low voltage, about +-12V,
so even with a quiescent current of 200mA, it consume just a handful watts;

A circuit is added to reduce the iddle current to 20mA when the output
level is just reaching the amp s noise ,with of course a delay of about 1 minute.

That way, mean comsumation is reduced to very low value...
  Reply With Quote
Old 10th April 2010, 02:32 PM   #7
diyAudio Member
 
event horizon's Avatar
 
Join Date: Feb 2008
Location: East Midlands, England
If you want to improve the amplifiers effeciency, throw the power resistors away on the drains & make a constant current source You'd again need to set the bias point at whatever current to half the rail voltage.

Or if you can get hold of a large high current (say 100mH or greater) choke & this would make the thing even more efficient (approaching 45% at a guess).You'd not need to bias for half the rail voltage, just enough current for pure class A operation. The amp would then swing nearly double the rail voltage because of the choke.
__________________
"Never let your morals prevent you from doing what is right!" Salvor Hardin
  Reply With Quote
Old 10th April 2010, 03:14 PM   #8
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default This is nice to play with..... i have simulated the previous one

Distorts a lot...but will assemble this one as i have a bunch of unused Fets.

Have you made it Sakis?.... have pictures?

I am thinking..this may be good to keep my coffee hot for all day.

It seems we can use transistors in the place of these expensive resistances.

Picture have Greek imported Olive oil, and some glues to fix boards into metalic enclosures, tape to help to insulate (provisory) something and new batteries for my multimeters..i use to replace each year..exausted or not.

regards,

Carlos
Attached Images
File Type: jpg Buld some amplifiers folks.jpg (476.6 KB, 118 views)
__________________
Instantaneous pcboard copper corrosion; https://www.youtube.com/watch?v=WED3Bvmxepk

Last edited by destroyer X; 10th April 2010 at 03:20 PM.
  Reply With Quote
Old 10th April 2010, 03:18 PM   #9
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
no Uncle Charly it was just one idea

i had very hot chilly supper last night and that results weird dreams in my sleep ha ha ha
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 10th April 2010, 04:49 PM   #10
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Oh!...this burns the exaust tubes dear Sakis

what a pain.

regards,

Carlos
__________________
Instantaneous pcboard copper corrosion; https://www.youtube.com/watch?v=WED3Bvmxepk
  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
ZCA 5 watt mosfet amp Efren Noble Solid State 54 19th September 2013 02:05 PM
B1-Turbo on a Chip EUVL Pass Labs 128 8th November 2012 03:03 AM
Ortofon MC 3 Turbo quality. GeirW Analogue Source 6 13th March 2012 06:24 AM
Mark Houstons ZCA Efren Noble Solid State 1 12th April 2009 06:03 PM
1987 Buick Regal Turbo T eds65gto Swap Meet 0 18th June 2005 08:53 PM


New To Site? Need Help?

All times are GMT. The time now is 10:05 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