Salas hotrodded blue DCB1 build - Page 131

necplusultra · 5th September 2011, 02:47 PM

getting major hum on one channel, the other is good.

anyone can guide me to troubleshoot with this?

regards

Tea-Bag · 5th September 2011, 02:49 PM

short both inputs, one at a time, see if that helps.
By short, I mean connect input positive and ground.

necplusultra · 5th September 2011, 03:15 PM

did the short input test and same result.

Tea-Bag · 5th September 2011, 03:23 PM

It kinda sounds like a ground loop.
How is the system connected. If your bi-amping, turn one amp off.

necplusultra · 5th September 2011, 03:33 PM

I removed the ldr and selector switch and have only R-G-B wires hooked up to the input.

I still get a hum but now, when I short the red input channel, the hum disappears, the black channel is still ok.

necplusultra · 5th September 2011, 03:34 PM

I am driving a gainclone. No issues when I have the pass B1 hooked up.

necplusultra · 6th September 2011, 07:59 AM

I reconnected all my wires and all is working now.
Zero hum!

bass is tight and very precise. Quite pleaesd with the setup

necplusultra · 6th September 2011, 08:04 AM

pics

5V bib for driving ldr based volume
standard 38R dcb1
selector switch with led indicator
volume pot with led indicator

thanks and regards

Salas · 6th September 2011, 08:26 AM

Hey, congrats. Classic diy style.

Salas · 6th September 2011, 08:31 AM

Quote:

Originally Posted by necplusultra

standard 38R dcb1

You mean two 38R in parallel or net total? We used 68//68 on the black boards for no sinks. Less value starts pushing it. It was 47//47 in the blue boards for small clip sinks.

5th September 2011, 03:23 PM	#1304
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 7	It kinda sounds like a ground loop. How is the system connected. If your bi-amping, turn one amp off. __________________ Salas Boards 2013 #2 CLICK HERE \| F6 Covertible PCB GB Boards Available \|DCB1 boards and KITS available PM\|SemiSouth R125, R100, R100A Available CLICK HERE \|F5TC Boards Sign UP CLICK HERE

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5th September 2011, 02:47 PM	#1301
necplusultra diyAudio Member Join Date: Jan 2011 Location: sitting down	getting major hum on one channel, the other is good. anyone can guide me to troubleshoot with this? regards

5th September 2011, 02:49 PM	#1302
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 7	short both inputs, one at a time, see if that helps. By short, I mean connect input positive and ground.

5th September 2011, 03:15 PM	#1303
necplusultra diyAudio Member Join Date: Jan 2011 Location: sitting down	did the short input test and same result.

5th September 2011, 03:33 PM	#1305
necplusultra diyAudio Member Join Date: Jan 2011 Location: sitting down	I removed the ldr and selector switch and have only R-G-B wires hooked up to the input. I still get a hum but now, when I short the red input channel, the hum disappears, the black channel is still ok.

5th September 2011, 03:34 PM	#1306
necplusultra diyAudio Member Join Date: Jan 2011 Location: sitting down	I am driving a gainclone. No issues when I have the pass B1 hooked up.

6th September 2011, 07:59 AM	#1307
necplusultra diyAudio Member Join Date: Jan 2011 Location: sitting down	I reconnected all my wires and all is working now. Zero hum! bass is tight and very precise. Quite pleaesd with the setup

6th September 2011, 08:26 AM	#1309
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Hey, congrats. Classic diy style.