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TO-3 SYMASYM
TO-3 SYMASYM
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Old 29th November 2014, 07:17 AM   #1041
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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Jean-Pierre reported on an error in my BlackBeauty - SYMASYM Layout.
My EAGLE software shows a pinout of EBC for the two BC546B transistors, which are used in the speaker-protection.

In reality these transistors are CBE - types.
Please flip these 2 transistors by 180.

Best regards - Rudi
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Old 29th November 2014, 11:26 PM   #1042
jprco is offline jprco  Canada
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To add to Rudi's post 1041, the 2 transistors to flip 180 degrees are Q13/Q14 (the 2 nearer the relays). The delay transistor Q10 is correct on the board and does not need to be flipped at all.
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Old 13th December 2014, 05:32 PM   #1043
Bangla H is offline Bangla H  Germany
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Hallo Rudi - Nordlight.
Hope i'm not to late you have a Set NJW- Symasym to sell?
It is a very nice completly Amp Board and i read in Forum some goodys about NJW Trannis.
For all a good ChristmasTime.
Regards.
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Old 14th December 2014, 10:02 AM   #1044
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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Hagen: I am sorry. I have no SYMASYM PCBs left currently.
Best regards - Rudi
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Old 8th January 2015, 12:34 PM   #1045
Fabian85 is offline Fabian85  Germany
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TO-3 SYMASYM
Which trimm Resistor R38 did you initially plan? BoM does only contain the resistor for the Symasym itself missing the 10k one for the Speaker Protection

Cheers
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Old 9th January 2015, 09:14 AM   #1046
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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Fabian, resistor R38 determines the time it takes, until the relay closes after Power-On.
The time is determined by resistor R38 and capacitor C26 (330F).

I have inserted a 100K trim-resistor and adjusted the delay to my needs.

Best regards - Rudi
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Old 10th January 2015, 11:30 AM   #1047
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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Gentlemen, from time to time I am asked, if I have any of my SYMASYM - PCBs left.
No - I do not have, I am sorry, they have all been sold, but ...

I have layouted a Rev.2 of the "BlackBeauty - SYMASYM" (see image 2) and together with 2 of my German DIY-friends I have populated the prototype - PCBs.
They work - of course, why not!
You can either use TO3-P or TO-264 transistor-pairs - as you like.

The size of the Rev.2 - PCB is 211 x 94mm.
So it fits perfectly into my DIY-carpenter Gerhard' s wooden case (which uses 100mm long heatsinks - see image 1).

What I am planning to do in 2015 is: to set up a "Multi-Media Amplifier" consisting of:

- this SYMASYM
- using my R-PRE (the attenuation being based upon LDRs), being followed by Calvin's line Buffer (giving you an an incredible natural sound)
- a RASPBERRY Pi B+ incl. I2S - DAC, giving you WLAN/INTERNET - connectivity

I will not offer you anything else in a group-buy but the shown PCBs.
But - maybe: you will follow me even then.

Best regards - Rudi_Ratlos
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File Type: jpg BB Rev2 003.jpg (454.8 KB, 397 views)
File Type: png BB Rev2.png (344.7 KB, 388 views)
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Old 10th January 2015, 11:50 AM   #1048
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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Adding a picture.

Best regards - Rudi
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File Type: jpg SYm 007.jpg (174.5 KB, 367 views)
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Old 10th January 2015, 04:28 PM   #1049
RKH is offline RKH  United States
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Default Interested in pcbs

Rudi,
I would be interested in a pair of the Black Beauty PBCs. Is there a place other than here to express interest?

Cheers,
Ryan
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Lighten up while you still can ...
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Old 10th January 2015, 05:06 PM   #1050
Fabian85 is offline Fabian85  Germany
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You are using PRP Resistors Rudi? For your final incarnation of the Symasym you spend some more money? ;-)
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