Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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 22nd April 2011, 10:47 AM   #1
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Default TO-3 SYMASYM

Some time ago my friend Joe asked me, if I would like and design an AMP with 2 pairs of TO-3 output transistors.

Both, Joe and I, have a couple of MJ2119x transistors at hand, which are worth to be used.

I studied some of the DIY - AMPs in this forum and felt, that Michael Bittner's SYMASYM would be the best match to do the job.

I transferred his SYMASYM version 5.3 into EAGLE, did not change anything in the frontend, but added the pairs of TO-3 in the backend.
DADOD (thank you very much!) simulated the resulting AMP in LTSpice: the results look perfect!

I have attached the schematics as a PDF-file.

After finishing the layout, I had some space left on the bottom right and left side of the PCB and implemented a standard capacitor-multiplier
for the frontend there.

This is the resulting layout:

Click the image to open in full size.

The red lines indicate tracks, that are running on the top side.
The TO-3s will be mounted on ALU-brackets.
The size of the PCB is 150 x 100mm.

Joe and I want the PCBs to be etched professionally, having the same quality as the PCBs, that I offered in my group-buys
for Carlos Mergulhao's DX Blame (see the picture below).

Click the image to open in full size.

Since the SYMASYM, the backend and the capacitor-multipliers are proven circuits, we won't do prototyping.

In order to get a decent (about 13€ per PCB) price from the etching company, I must order at least 10 PCBs.

Maybe some of you like this design (SYMASYM with TO-3) and join the party.
I am sure, it will give you a big bang for your bucks.
Take a careful look at the schematics then and tell me, if I shall change anything.

Best regards - Rudi_Ratlos
Attached Files
File Type: pdf Symasym.pdf (38.3 KB, 1572 views)

Last edited by Rudi_Ratlos; 22nd April 2011 at 10:52 AM.
  Reply With Quote
Old 22nd April 2011, 10:52 AM   #2
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Nice project! However, the combination of rounded and angled traces does jar a little.
__________________
Al
I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort
  Reply With Quote
Old 22nd April 2011, 10:57 AM   #3
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
I will do some final cosmetics to the layout, be sure!

Best regards - Rudi_Ratlos
  Reply With Quote
Old 22nd April 2011, 11:01 AM   #4
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Yeah, I know. I frequently spend longer tidying up cosmetic stuff than working out the actual layout.
__________________
Al
I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort
  Reply With Quote
Old 22nd April 2011, 04:29 PM   #5
diyAudio Member
 
metal's Avatar
 
Join Date: Jan 2004
Thanks to Rudi who created the asc file and sent the other models included in his asc file.
Attached Images
File Type: gif rudi_symasym.gif (60.2 KB, 4180 views)
Attached Files
File Type: pdf simasym.pdf (51.9 KB, 573 views)
File Type: txt simasym.txt (2.9 KB, 281 views)

Last edited by metal; 22nd April 2011 at 04:49 PM.
  Reply With Quote
Old 1st May 2011, 10:53 AM   #6
diyAudio Member
 
Join Date: Oct 2004
Location: Aalborg, Denmark
Nice layout.

Last edited by Neutrality; 1st May 2011 at 11:00 AM.
  Reply With Quote
Old 11th May 2011, 10:19 AM   #7
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
I have just finished the "cosmetic improvements" of the layout and the silkscreen of the TO-3 SYMASYM - PCB.
Here it is:

Click the image to open in full size.

Since there is some interest in the PCB in the German Analog-Forum, I will be able to order the minimum amount of PCBs.

Rich: are you still interested?

Best regards - Rudi_Ratlos
  Reply With Quote
Old 13th May 2011, 08:25 AM   #8
diyAudio Member
 
Join Date: May 2005
Hi

I'm also in for a couple of PCB's

Thanks
  Reply With Quote
Old 13th May 2011, 08:45 AM   #9
diyAudio Member
 
digits's Avatar
 
Join Date: Apr 2011
Rudi, I see you moved the traces there around the top left TO-3, I didn't like the first one, and the second one you got almost right. I see you now allowed space for the mounting screw, but if possible I suggest you bring the left trace back out to the side to reduce capacitance between the two traces, unless of coarse you think a little in that position is benneficial, other wise nice work. I know Carlos would drive you mad to get all those TO92 transistors in a row
  Reply With Quote
Old 13th May 2011, 10:36 AM   #10
Luke352 is offline Luke352  Australia
diyAudio Member
 
Join Date: Jul 2006
Send a message via MSN to Luke352
Do you have an idea on what postage would cost for a pair of boards to Australia? I may be interested in a pair.
  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
Symasym PCB Khron Solid State 58 17th May 2012 07:18 AM
Troubleshooting your Symasym anatech Solid State 235 22nd September 2011 09:40 PM
Help with Symasym jandr49 Solid State 6 18th September 2011 12:13 PM
Symasym 5.3 jandr49 Solid State 2 16th April 2010 03:03 PM


New To Site? Need Help?

All times are GMT. The time now is 03:43 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