a wonderfull sziklai - Page 20 - 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 24th January 2012, 09:30 AM   #191
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Do you realise that all the BC transistors are shown upside down?
__________________
regards Andrew T.
  Reply With Quote
Old 24th January 2012, 09:56 AM   #192
Account disabled at member's request
 
Join Date: May 2006
500 watt from 2 pairs of output transistors, 700 watt in 4 ohms ?? I hope the designer has more common sense than that and or is a good liar and looking to make a quick few bucks.
  Reply With Quote
Old 24th January 2012, 10:16 AM   #193
catalin is offline catalin  Romania
diyAudio Member
 
Join Date: Jun 2007
I am agree ,it a lie that this can handle 500w/4ohms.It can reach to 500 w but for short term because the output transistor can't handle such power.
You can mod it by putting in paralel 4 transistor (2npn + 2pnp )on each channel
__________________
"please try to listen to some music through the amplifier instead. Life is so short ..."
  Reply With Quote
Old 24th January 2012, 10:19 AM   #194
alex mm is offline alex mm  Europe
diyAudio Member
 
alex mm's Avatar
 
Join Date: Mar 2006
Location: ROMANIA ,
Quote:
Originally Posted by boyet0173 View Post
Thank you alexmm for the pcb design. Can you post the pcb layout for etching? Thanks in adavance.

Regards,
Boyet
..... you will find in attachment PCB in pdf.
Regards Alex.
Attached Files
File Type: pdf PCB JOY V4.7 B&W.pdf (36.1 KB, 223 views)
File Type: pdf PCB JOY V 4.7 ALL.pdf (127.0 KB, 230 views)
  Reply With Quote
Old 24th January 2012, 10:21 AM   #195
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Homemodder's concerns are confirmed by the first page specification.
500W into 8r0 and 700W into 4r0 indicate that the output voltage has started to collapse trying to drive a 4r0 resistor. (-1.55dBV ref. 8r0)
This tells me and should alert everyone else reading, that the amplifier is not capable of driving a 4r0 load.
That leads to the conclusion that the amplifier is not capable of driving an 8ohms speaker.

Would it drive a 16ohms speaker? The output power is likely to be ~280W into 16r0.

Using that bit of implied Power we can then go forward and determine a suitable output stage.
For FETs use 4times 280W of output devices. A 2pair output stage using 250W devices is probably close enough to work well.
For BJTs use 5 to 6times 280W of output devices, i.e. about 1400W to 1700W of output devices.

This results in a 4pair of 200W devices run on that +-90Vdc for 280W into 16ohms speakers.

I cannot see how any designer can claim 1000W unless he only expects car audio as his audience.
__________________
regards Andrew T.

Last edited by AndrewT; 24th January 2012 at 10:27 AM.
  Reply With Quote
Old 24th January 2012, 01:12 PM   #196
diyAudio Member
 
JOHN BALI's Avatar
 
Join Date: Jun 2010
Location: Near the Mountain
Quote:
Originally Posted by catalin View Post
I am agree ,it a lie that this can handle 500w/4ohms.It can reach to 500 w but for short term because the output transistor can't handle such power.
You can mod it by putting in paralel 4 transistor (2npn + 2pnp )on each channel
I'm a little confuse about it, putting in pararel "more" 4 transistors?
this kit already have 4 transistors per channel.
Maybe you mean add another 4 transistors, total 8 transistors per channel to get
500 w @ 4 ohm & supply +-70VDC, right? just to make sure...

Then after I do add 2 pair transistors or maybe 3 pair for more safety?
this will be 500 w + 500 w stereo amp.

That picture was from stereo kit that why write 1000 watt, who write is a liar
so many lies here where I live .
Thanks to you all to tell me the truth

Anyway I'm not go for 500w @ 4 ohm yet,
maybe better for me to try this 2 pairs @ lower voltage
for only 2 pair I guess +-56 volt is maximum.

& better is someone can tell me
any way to make this amp sounds more "soft"
where is the key?
I want to try mod some resistor maybe 470R/5w (post #163 & #164)
but don't know if that safe or not to do.
or better just leave it,
this amp just can't be help this just old design not so good.

Regards
__________________
Thank you, I wish you happy
peace & G B U
  Reply With Quote
Old 24th January 2012, 03:18 PM   #197
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
You will get ~+-57Vdc from a 40+40Vac transformer.
or
~+-50Vdc from a 35+35Vac transformer.
Both of these will be far more likely to suit that design than 50Vac or 60Vac transformers.
__________________
regards Andrew T.
  Reply With Quote
Old 25th January 2012, 03:57 PM   #198
Account disabled at member's request
 
Join Date: May 2006
Sakis is this design another that you have found to be good sounding and so asking for it to be simmed. Im just curious as I find the compensation used interesting, miller is accross beta enhancer and then lag compensation is used on the vas.
  Reply With Quote
Old 25th January 2012, 09:29 PM   #199
Stee is offline Stee  Italy
diyAudio Member
 
Stee's Avatar
 
Join Date: Jul 2005
Location: milan
Default I don't like current mirror input

see my adjustment
it's much better have feedback by resistor
Attached Images
File Type: jpg TOROAMP5.jpg (86.6 KB, 403 views)
__________________
Please download my best audio idea https://www.facebook.com/DiyAudioHiEnd
  Reply With Quote
Old 17th May 2012, 01:15 PM   #200
diyAudio Member
 
Join Date: May 2012
hy sakis...for 4 pairs 2sc5200 how many watt output?
  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
Sziklai output Moby Solid State 68 27th January 2011 10:39 AM
Hybrid Sziklai CFP Stee Solid State 0 27th December 2008 10:53 AM
ccs-loaded sziklai ionomolo Solid State 132 30th June 2008 06:39 AM
My DIY project - Wonderfull Loudspeakers ! Emeric Multi-Way 6 9th May 2008 02:38 AM


New To Site? Need Help?

All times are GMT. The time now is 05:33 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