TO-3 SYMASYM

[PeterH]

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]

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

 

[andreasw]

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]

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

Best regards - Rudi_Ratlos

 

[AndrewT]

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]

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]

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]

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]

A picture will tell you more than a 1000 words ...



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

Best regards - Rudi_Ratlos

 

[AndrewT]

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

 

[Jazzzz]

Hi Rudi,

i would also like to join with:

4 SYMASYM Boards
4 PSU Poards
8 LSProtect Boards
4 SoftPowerOn Boards

Best regardes from Hamburg too,
Basti

 

[Archie203]

Hi Rudi, if it's not too late, i would like to join the group buy with: 4 SYMASYM Boards 2 PSU Boards 2 LSProtect Boards 2 SoftPowerOn Boards Best Regards, Rico

 

[Reibradi]

Order

Hi Rudi.
Last day, I could still jump on the boat.
May I ask what I do exactly need for stereo (no monos here)?
I am quite new to this - will there be instructions for a dummy like me?
Best wishes
Chris (from Munich)

 

[smichael]

Hi Rudy,

I would like to buy 4 amp boards.
Thanks for your efforts.

Steen

 

[franzm]

Hallo Rudi
If it's not too late, I would buy 2 amp boards
Franz

 

[Rudi_Ratlos]

TO-3 SYMASYM is closed now

Dear TO-3 SYMASYM friends,

I will close this group-buy now.
I do not accept further orders anymore.

I will now collect the existing orders, request for a price-quote from the etching company and will publish the resulting order list
with prices and money transfer information this evening / tomorrow.

Many thanks for your interest so far.

Best regards - Rudi_Ratlos

 

[rx7mark]

Rudi,
You said Fiday to close group buy? If its not too late, put me down for for boards for a dual mono amp:

2 SYMASYM Boards
2 PSU Poards
2 LSProtect Boards
2 SoftPowerOn Boards

let me know.
Mark

 

[Reibradi]

Danke für die Nachricht

Hi Rudi.
Way cool.
I have sensitive speakers, so no need for mono pus.
I tried to send you a PM but your box is full.
How do you arrange payment: now, in between, later?
Thanks
Chris

 

[Rudi_Ratlos]

Chris,

I cleared my PM - box.

I will give you the details about the prices for PCBs and shipping tonight / tomorrow.

Best regards - Rudi_Ratlos

 

[Reibradi]

Thanks Rudi.
Will be away for the weekend, but I guess that´s fine.
Best wishes
Chris