[KGSSHV Carbon Build Thread]

Hi All,

Finally I just finished all the wiring and assembly. When I connect my carbon to electricity the first time, I got following issues:       

1. the +ve power board, the 20k Ohm resistor got smoke.

2. only one LED on each carbon board is lighted up. But the one is lighted up on the LED close to the board name and another one is on the further side of the board name.

Attached please find the photo of my gear. Can you give me some advice on how I can troubleshoot?

Thanks.

[KGSSHV Carbon Build Thread]

lol I like your illustration!  Yes it really means nothing...just want to make it a bit sophisticated. Anyway I changed to single Led to indicate power on only.

[KGSSHV Carbon Build Thread]

3 minutes ago, kevin gilmore said:

But there are 4 power supplies, 5 counting the bias.

What you want is a series of detectors that detect + 15 volts +/-.25 volts, -15 volts +/-.25 volts, +400 or +450 +/-10 volts, and -400 or -450 +/-10V

that all requires an extra board with comparators, voltage references and a number of other parts.

My original plan was to indicate R+, R-, L+, L- on the amp board instead of the power. As the LED on amp boards drive the current, so I just change to simply indicate power on/off only by using GRLV voltage output.

[KGSSHV Carbon Build Thread]

18 minutes ago, GeorgeP said:

you could, but why would you need two? What would that tell you?

One for positive and one for negative rail...is this weird? I am drawing CAD and going to submit it to Hifi2000 for case customization.

 

[KGSSHV Carbon Build Thread]

2 hours ago, kevin gilmore said:

the led's drive the current sources. red only, and do not extend for any reason.

 

Thanks Kevin. In this case, Can I make use of the output of the GRLV (+15/-15V) to power up two LED for front panel indication?

[KGSSHV Carbon Build Thread]

I have a question regarding the LED on Carbon amp board. I scanned through the posts and 1.7V Red LED is recommended. But I would like to extend the LED to the panel to indicate 4 rails therefore I want to pick white/blue LED instead of red. However, I checked all Blue/White LED sold in Mouser, all of them are with forward voltage 3V above. In this case,

1.

[Group Buy - Carbon V7.0]

Hi Sorenb,

Not sure if I can withdraw this group buy as I just received some boards from friends locally here (their spare boards from last GB). Just let me know if my quantity have been included and I will pay anyway. Thanks.

 

[KGSSHV Carbon Build Thread]

Hi All,

I am just going to start building this and I am preparing the shopping list. I just wonder what are the primary components to be matched in order to achieve better outcome? Thanks

[Group Buy - Carbon V7.0]

Thanks a lot sorenb. I have placed my order. I live in Hong Kong.