SYMEF amplifier - Page 13 - 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 19th November 2011, 04:38 PM   #121
diyAudio Member
 
Join Date: Oct 2011
Quote:
Originally Posted by drowranger View Post
I have check the supplier the smallest casing is 26mm x 13mm it takes up the space of the whole input filter circuit.capacitor is metallised polypropylene is there any other way for this?

p.s. can i use metallised polyester or uncoated MKTpolyester capacitor and rating is 63volts?
regards,
joel
Hi Joel,

C8 Could be 4.7uF 16V NP . C6 100 uF 6.3V NP (you can get rid of the diode) unless there are any objections

kind regards
  Reply With Quote
Old 19th November 2011, 04:45 PM   #122
diyAudio Member
 
Join Date: Oct 2011
Quote:
Originally Posted by drowranger View Post
pin configuration of bc 556 is cbe while mpsa92 is ebc.im planning to use 2n5401 and compatible to the board i have design.is this fine also?
Hi Joel,

Your progress and work is looking soo beautiful . You can use the 2N5401, however what you are creating looks promising that is why I even suggest using KSA992 if you can lay your hands on it

kind regards
  Reply With Quote
Old 19th November 2011, 04:49 PM   #123
diyAudio Member
 
Join Date: Oct 2011
Quote:
Originally Posted by OnAudio View Post
Hi Joel,

Your progress and work is looking soo beautiful . You can use the 2N5401, however what you are creating looks promising that is why I even suggest using KSA992 if you can lay your hands on it

kind regards
This suggestion is for Q4, Q3 on your schematic
  Reply With Quote
Old 19th November 2011, 05:16 PM   #124
diyAudio Member
 
Join Date: Oct 2011
Hi Joel,

Some suggested voltages

C1 200V
C2 100V
C3 100V
C4 100V
C5 6.3V
C6 6.3V
C7 35V
C8 16V
C10 63V
C11 63V

kind regards
  Reply With Quote
Old 19th November 2011, 05:19 PM   #125
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by drowranger View Post
can i use metallised polyester or uncoated MKTpolyester capacitor and rating is 63volts?
50V or 63V or 100V polyester or terephthalate or mylar. any of these will be far better than any electrolytic. All will be smaller than MKP, all will be cheaper than MKP.

You could go down to 2u2F or 3u3F.
2u2F gives up 2octaves of sub-bass. Might be worth trying that. You like the result.
__________________
regards Andrew T.
  Reply With Quote
Old 20th November 2011, 09:49 AM   #126
diyAudio Member
 
Join Date: Aug 2009
Default c6 to 100uf

I retain the diode just in case it will be needed.I found 4.7uf metallised polypropylene rated 250 volts for c8 this is the lowest voltage rating.Also change the layout.check again if this is final.
Attached Images
File Type: jpg symef top view.jpg (283.0 KB, 720 views)
Attached Files
File Type: pdf foil pattern symef.pdf (45.4 KB, 112 views)
File Type: pdf schematic.pdf (24.1 KB, 148 views)
File Type: pdf symef top view.pdf (85.1 KB, 126 views)
  Reply With Quote
Old 21st November 2011, 03:03 AM   #127
diyAudio Member
 
Join Date: Oct 2011
Quote:
Originally Posted by drowranger View Post
I retain the diode just in case it will be needed.I found 4.7uf metallised polypropylene rated 250 volts for c8 this is the lowest voltage rating.Also change the layout.check again if this is final.
Hi Joel,

Checked the schematic, looks OK.

Cheers
  Reply With Quote
Old 21st November 2011, 04:35 AM   #128
diyAudio Member
 
Join Date: Aug 2009
Default using ksa992 and bc556b

Quote:
Originally Posted by OnAudio View Post
Hi Joel,

Your progress and work is looking soo beautiful . You can use the 2N5401, however what you are creating looks promising that is why I even suggest using KSA992 if you can lay your hands on it

kind regards
I change pcb layout for ksa992 and for bc556b.does bc556b superior than 2n5401.it looks like ksa992 is hard to find but will try to get it.

regards,
joel

p.s. now I can start for the pcb.
Attached Images
File Type: jpg symmef using bc556.jpg (282.5 KB, 650 views)
File Type: jpg symmef using ksa992.jpg (282.8 KB, 615 views)
  Reply With Quote
Old 21st November 2011, 11:22 AM   #129
diyAudio Member
 
Join Date: Oct 2007
Joel, very PCB designs are really nice.
Can I suggest you add pins to allow mounting this style of
multiturn trimpots too for more flexibility?

Click the image to open in full size.
  Reply With Quote
Old 21st November 2011, 11:32 AM   #130
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
That pic shows 3 inline pins.
Add a 4th hole/pad for the offset pin version.
This can be important when one wants the trim rotation direction to achieve the expected effect.
__________________
regards Andrew T.
  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
Wanted: DIY amplifier builder with experience. I need a 0.7 ohm stable amplifier Audiophilenoob Swap Meet 34 16th May 2005 11:58 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier. novtango Pass Labs 2 21st October 2002 01:50 AM


New To Site? Need Help?

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