Help for Main Transformer Spec for CCDA - Page 3

SKLau · 16th September 2012, 10:39 AM

I have a grounding question.

The HV centre-tapped schematic shown above has a dot line on jumper J13 which bridges the PCB’s ground to the chassis. If I use the RCA jack isolated from the chassis. Do I jumper the J13? If not where do I ground the signal ground to the chassis?

I want to use a LED to indicate the CCDA is on. What is the simple way to do it?

AJT · 16th September 2012, 11:22 PM

470 ohm 1 watt resistor in series with the led and then connect to the filament supply...

SKLau · 16th September 2012, 11:33 PM

Thanks Tony for the LED connection.

SKLau · 26th May 2013, 09:08 AM

Just finished the building of the CCDA. After tuning the R9 to 6.8k, the sound is quite amazing. Good ambience and rich harmonics.

A special thanks to Jim who helped me getting a good quality transformer with less cost and
the wiring of the heaters in voltage doubler configuration.

The cost of the EDCOR-XPWR196-240 + shipping to Australia is USD108.

The EDCOR is well build and solid with no buzz and hum. The CCDA is quiet.

I deployed the 4 x 100uf 500v Black Gates from my dismayed kit built to be used in the CCDA project. They are happy to find a home to show their performance.

Here are the pics for the CCDA.

16th September 2012, 11:22 PM	#22
AJT diyAudio Moderator Join Date: May 2003 Location: Palatiw, Pasig City	470 ohm 1 watt resistor in series with the led and then connect to the filament supply... __________________ http://www.elab.ph/forum/index.php?topic=32688.0

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16th September 2012, 10:39 AM	#21
SKLau diyAudio Member Join Date: Dec 2004 Location: Melbourne	I have a grounding question. The HV centre-tapped schematic shown above has a dot line on jumper J13 which bridges the PCB’s ground to the chassis. If I use the RCA jack isolated from the chassis. Do I jumper the J13? If not where do I ground the signal ground to the chassis? I want to use a LED to indicate the CCDA is on. What is the simple way to do it?

16th September 2012, 11:33 PM	#23
SKLau diyAudio Member Join Date: Dec 2004 Location: Melbourne	Thanks Tony for the LED connection.

26th May 2013, 09:08 AM	#24
SKLau diyAudio Member Join Date: Dec 2004 Location: Melbourne	Just finished the building of the CCDA. After tuning the R9 to 6.8k, the sound is quite amazing. Good ambience and rich harmonics. A special thanks to Jim who helped me getting a good quality transformer with less cost and the wiring of the heaters in voltage doubler configuration. The cost of the EDCOR-XPWR196-240 + shipping to Australia is USD108. The EDCOR is well build and solid with no buzz and hum. The CCDA is quiet. I deployed the 4 x 100uf 500v Black Gates from my dismayed kit built to be used in the CCDA project. They are happy to find a home to show their performance. Here are the pics for the CCDA.