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
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
Attachments
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.
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.
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.
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
Cheers
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 (330µF).
I have inserted a 100K trim-resistor and adjusted the delay to my needs.
Best regards - Rudi
The time is determined by resistor R38 and capacitor C26 (330µF).
I have inserted a 100K trim-resistor and adjusted the delay to my needs.
Best regards - Rudi
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
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
Attachments
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
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
You are using PRP Resistors Rudi? For your final incarnation of the Symasym you spend some more money? ;-)
Rudi, it seems you are n a big love affair with Symasym project in so many versions 🙂
Sent from my iPad using Tapatalk
Sent from my iPad using Tapatalk
If anyone interested, I am selling my Black Beauty boards to fund for a prebuilt symasym. Still untouched. Just want to get what I paid, plus shipping. Feel free to PM me.
I am also selling 2 Black Beauty boards (unpopulated) including a set of matched transistors (4 x NJW0302G & 4 x NJW0281G) for a dual mono setup. Boards 26,-€ and transistors 20,-€ + shipping and Paypal fees (4/100) - this is exactly what I paid in the last GB. If anyone is interested please send me a PM.
All the best wishes,
Michael
All the best wishes,
Michael
Started a Group Buy Yet?
Rudi,
Have you started a group buy for the Black Beauty PCBs? Where do I sign up? I'd be interested in 2 PCBs and the BOM - hopefully for Mouser. 🙂 How much for 2 PCBs USD. Your plans for 2015 look very interesting. Maybe by the time I get done with the VCPre, I'll be ready to tackle the Multi-Media Amp. Great stuff!
BTW, will these relays work in the VCPre?
PS. I mean Rev 2 of the SYSASM. 🙂
-Rick
Rudi,
Have you started a group buy for the Black Beauty PCBs? Where do I sign up? I'd be interested in 2 PCBs and the BOM - hopefully for Mouser. 🙂 How much for 2 PCBs USD. Your plans for 2015 look very interesting. Maybe by the time I get done with the VCPre, I'll be ready to tackle the Multi-Media Amp. Great stuff!
BTW, will these relays work in the VCPre?
PS. I mean Rev 2 of the SYSASM. 🙂
-Rick
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Rick, Ryan,
I will order 10 PCBs of the one shown in the image below on this weekend.
This is where my SYMASYM-journey has come to an end.
I have the feeling that I can't do it better.
As my old friend EVETTE told me: You are really coming into your own now.
I will not offer any SYMASYM-PCBs in the future anymore but will concentrate myself on an "Amplifier's Surrounding".
For example: a LDR-based attenuation is the best that I have ever listened to.
But even this one can be (theoretically only?) improved by a digitally controlled potentiometer (based upon MCP4151) being followed by a VCCS.
I have been an IBM - software-engineer for more than 35 years of my life.
So I will go on with this SYMASYM, a digitally controlled attenuation and RASPBERRY PI B+ INTERNET / WLAN connectivity and DAC for music-streaming and will exhaust my digital brain.
You are happlily invited to follow my digital intentions.
Best regards - Rudi
P.S.: I forgot to say that I am ccurently playing around with the TO3-P SANKENs 2SC3263 and 2SA1294.
But you can use any BJT TO3-P - (for example: NJW0) and even TO264 - transistor (like MJL) as well.
I will order 10 PCBs of the one shown in the image below on this weekend.
This is where my SYMASYM-journey has come to an end.
I have the feeling that I can't do it better.
As my old friend EVETTE told me: You are really coming into your own now.
I will not offer any SYMASYM-PCBs in the future anymore but will concentrate myself on an "Amplifier's Surrounding".
For example: a LDR-based attenuation is the best that I have ever listened to.
But even this one can be (theoretically only?) improved by a digitally controlled potentiometer (based upon MCP4151) being followed by a VCCS.
I have been an IBM - software-engineer for more than 35 years of my life.
So I will go on with this SYMASYM, a digitally controlled attenuation and RASPBERRY PI B+ INTERNET / WLAN connectivity and DAC for music-streaming and will exhaust my digital brain.
You are happlily invited to follow my digital intentions.
Best regards - Rudi
P.S.: I forgot to say that I am ccurently playing around with the TO3-P SANKENs 2SC3263 and 2SA1294.
But you can use any BJT TO3-P - (for example: NJW0) and even TO264 - transistor (like MJL) as well.
Attachments
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