TO-3 SYMASYM - Page 7

PeterH · 5th September 2011, 11:06 PM

Hi Rudi,

i would also like to join the group buy with

4 SYMASYM Boards
4 PSU PCBs
8 LS protect Boards

Hope it is not too late! Thank you!

Best regards,
Peter

Leatherface · 6th September 2011, 07:41 AM

Hi Rudi,

thanks for the infos to the Soft Power On Circuit. I'll give it a try. Please add also 7 PCBs for the Soft Power On for me.

Thanks and regards,

Chris

andreas w. · 6th September 2011, 07:42 AM

Hello Rudi,

please add for me further PCB's:

2 Symasym boards
2 PSU PCB's

Thank you for sending the manual.

Best regards
Andreas

Rudi_Ratlos · 6th September 2011, 09:06 AM

This group-buy will be closed on Friday, 9th of September.

Best regards - Rudi_Ratlos

AndrewT · 6th September 2011, 11:39 AM

post58 schematic:

I don't recognise what LSP1 & LSP2 means. Are these the mains Live and Neutral connections/feeds?

The terminals labeled 220V Back is actually the mains return lead. Usually labeled Neutral. But why does it go through the Primary of the 12Vac transformer before tapping into the Mains Neutral?

Rudi_Ratlos · 6th September 2011, 12:54 PM

Andrew,

mains return = mains neutral in my glossary.

LSP1 and LSP2 is the EAGLE name for a solder point.
(I will change the layout to show a 2-pole PCB connector there.)

You have to connect an on-/off - switch to this connector / to these solder points.

The switch connects the small transformer on the left side to the mains hot lead.
When the switch is turned on, the mains voltage is applied to the transformer, the 7812 will generate 12 VDC, the upper relay K1 is closed
and current will flow through K1 and the thermistors, being delimited by the value of the thermistors.
When the LM555 timer triggers and closes K2, the mains current will flow "unhindered".

So this circuit delimits the inrush current for a short period of time (determined by R1/C1).

I hope this explanation was helpful.

Best regards - Rudi_Ratlos

tome · 7th September 2011, 06:25 AM

Hi Rudi
You also have output tranzistors, are they matched ?
Put me on list for 2 sets (8 pcs.) if they are matched.
Best regards
tomas

AndrewT · 7th September 2011, 09:57 AM

Rudi,
I still don't understand why the mains return from the big transformer has to pass through the small 12Vac transformer Primary.
The schematic has lost me !

Rudi_Ratlos · 7th September 2011, 12:22 PM

http://www.abload.de/img/andrewk8th.png

Best regards - Rudi_Ratlos

AndrewT · 7th September 2011, 01:45 PM

Now I see and understand.
What a confusing way to draw that original diagram.

7th September 2011, 12:22 PM	#69
Rudi_Ratlos diyAudio Member Join Date: Jun 2009 Location: Hamburg / Germany	A picture will tell you more than a 1000 words ... http://www.abload.de/img/andrewk8th.png Best regards - Rudi_Ratlos

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5th September 2011, 11:06 PM	#61
PeterH diyAudio Member Join Date: Sep 2004 Location: Planet Earth	Hi Rudi, i would also like to join the group buy with 4 SYMASYM Boards 4 PSU PCBs 8 LS protect Boards Hope it is not too late! Thank you! Best regards, Peter

6th September 2011, 07:41 AM	#62
Leatherface diyAudio Member Join Date: Aug 2011	Hi Rudi, thanks for the infos to the Soft Power On Circuit. I'll give it a try. Please add also 7 PCBs for the Soft Power On for me. Thanks and regards, Chris

6th September 2011, 07:42 AM	#63
andreas w. diyAudio Member Join Date: May 2008 Location: NRW	Hello Rudi, please add for me further PCB's: 2 Symasym boards 2 PSU PCB's Thank you for sending the manual. Best regards Andreas

6th September 2011, 09:06 AM	#64
Rudi_Ratlos diyAudio Member Join Date: Jun 2009 Location: Hamburg / Germany	This group-buy will be closed on Friday, 9th of September. Best regards - Rudi_Ratlos

6th September 2011, 11:39 AM	#65
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	post58 schematic: I don't recognise what LSP1 & LSP2 means. Are these the mains Live and Neutral connections/feeds? The terminals labeled 220V Back is actually the mains return lead. Usually labeled Neutral. But why does it go through the Primary of the 12Vac transformer before tapping into the Mains Neutral?

6th September 2011, 12:54 PM	#66
Rudi_Ratlos diyAudio Member Join Date: Jun 2009 Location: Hamburg / Germany	Andrew, mains return = mains neutral in my glossary. LSP1 and LSP2 is the EAGLE name for a solder point. (I will change the layout to show a 2-pole PCB connector there.) You have to connect an on-/off - switch to this connector / to these solder points. The switch connects the small transformer on the left side to the mains hot lead. When the switch is turned on, the mains voltage is applied to the transformer, the 7812 will generate 12 VDC, the upper relay K1 is closed and current will flow through K1 and the thermistors, being delimited by the value of the thermistors. When the LM555 timer triggers and closes K2, the mains current will flow "unhindered". So this circuit delimits the inrush current for a short period of time (determined by R1/C1). I hope this explanation was helpful. Best regards - Rudi_Ratlos

7th September 2011, 06:25 AM	#67
tome diyAudio Member Join Date: Apr 2010 Location: Ohrid, Macedonia	Hi Rudi You also have output tranzistors, are they matched ? Put me on list for 2 sets (8 pcs.) if they are matched. Best regards tomas

7th September 2011, 09:57 AM	#68
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Rudi, I still don't understand why the mains return from the big transformer has to pass through the small 12Vac transformer Primary. The schematic has lost me !

7th September 2011, 01:45 PM	#70
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Now I see and understand. What a confusing way to draw that original diagram.