TO-3 SYMASYM - Page 22 - diyAudio
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 31st January 2012, 05:26 PM   #211
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Gentlemen,

the PCBs are due to arrive the week of Feb. 8th.

I will ship them out immediately after their arrival.
The letters are already prepared.

Sorry for the delay. It has been due to "New Year's Holiday" in China.

I will send to you all the "TO-264 Builder's Manual" in a minute.

Best regards - Rudi_Ratlos
  Reply With Quote
Old 31st January 2012, 05:39 PM   #212
diyAudio Member
 
meanman1964's Avatar
 
Join Date: Oct 2006
Location: Belgium the land of chocolate
Rudi,
Great news!!
  Reply With Quote
Old 31st January 2012, 06:02 PM   #213
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Patrick,

there is nothing "great" about this news.

It simply says: "Gentlemen, don't get impatient please! You will receive the PCBs of a very, very good sounding amplifier in a week or two".

I am sorry for the delay.

Best regards - Rudi
  Reply With Quote
Old 7th February 2012, 08:19 PM   #214
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Gentlemen,

I am happy to tell you that the PCBs have been etched today and are already on their way to me.

Here is the URL of the tracking ID:

DHL | Tracking | English

if you like to follow their way.

Best regards - Rudi
  Reply With Quote
Old 10th February 2012, 02:13 PM   #215
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Gentlemen,

I received the PCBs today:

Click the image to open in full size.

http://www.abload.de/img/joe019mluo6.jpg

(they are flawless as usual)

and will dispatch them tomorrow.

You all will have them in your hands in the course of next week.

I wish you a nice build and a nice sound!

Best regards - Rudi_Ratlos
  Reply With Quote
Old 19th February 2012, 11:21 PM   #216
Vigier is offline Vigier  Netherlands
diyAudio Member
 
Join Date: Nov 2002
Location: Netherlands
I received my PCB's! Thank you for the great service and good packaging.
Kind regards, Vigier
  Reply With Quote
Old 20th February 2012, 07:23 PM   #217
diyAudio Member
 
Join Date: Feb 2008
So did I, very good quality!!!

Should we make a new thread for these boards? I will start building a Symasym and I have some questions I would like to ask, have lots of compatible parts and I would like to hear other opinions regarding them. Also I was wondering if it's possible to use higher voltage rails and what components need to be upgraded...?
  Reply With Quote
Old 20th February 2012, 08:03 PM   #218
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Butch,

I do not think that it is necessary to open an extra builder's thread.
Since the group-buy is closed, you can use this thread to post your thoughts / questions in here.

Yes: you can of course raise the rail-voltages! You are even welcome to do this!
EVETTE did this as well and is absolutely content with the results.

Be aware of the value of the rail-capacitors C16 and C17 then!
And do not forget and activate the cap-multiplier with the ZENER.

Best regards - Rudi

Last edited by Rudi_Ratlos; 20th February 2012 at 08:06 PM.
  Reply With Quote
Old 20th February 2012, 08:32 PM   #219
diyAudio Member
 
Join Date: Feb 2008
Thanks Rudi, I'll examine the schematics and see what can be easily upgraded.
Can you tell me what was the max voltage for Symasym, that worked stable?
I am fimiliar with Rod's capacitance multiplier but I have no idea what you mean by "activate the cap multiplier with the zenner". I feel a bit rusty now, need to do some reading to remember few things.
My main question is about the LEDs present on the PCB, not sure what are they for.

Cheers,
Vlad
  Reply With Quote
Old 20th February 2012, 10:27 PM   #220
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Vlad,

the LEDs simply reflect the status of the power rails.
If they burn, it means: power rail voltage is present. So the LEDs should burn all the time.

I have added a jumper (two jumpers) on the PCB to bypass or not the cap-multipliers for the positive and negative rail.

If the jumper is set (activated), the cap-multiplier will be bypassed and the frontend will be powered by the backend PSU (voltage).
But take care then: if you drive the AMP from a 30 VAC PSU (f.e.), this may blow the sensitive input transistors!

If the jumper is not set, the cap-multiplier is activated.
It includes a ZENER diode to limit the voltage for the frontend to a value that is convenient (f.e. 39V) and will prevent any harm
to the input transistors, even if you drive the backend with a higher voltage.


Best regards - Rudi
  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 08:18 AM
Troubleshooting your Symasym anatech Solid State 235 22nd September 2011 10:40 PM
Help with Symasym jandr49 Solid State 6 18th September 2011 01:13 PM
Symasym 5.3 jandr49 Solid State 2 16th April 2010 04:03 PM


New To Site? Need Help?

All times are GMT. The time now is 01:47 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