Another finished brianGT GC.

waltson · 10th January 2005, 04:41 PM

This is my new amplifier: HV1!

It's made of standard brianGT boards and sheets of 5mm aluminium. The pot is Alps 10K log, and the selector switch is made by Elma.
I think the sound is good, except for a slight hum that you can hear if you put your ear close to the speaker.

Pictures:

Image 1
Image 2
Image 3
Image 4
Image 5

wim · 10th January 2005, 05:16 PM

In one word.... beautyfull, especialy the leds in the knobs!!

Great job.

ble0t · 10th January 2005, 05:47 PM

Very nice work

troystg · 10th January 2005, 06:08 PM

Hey Waltson-

Beautiful. Love the leds in the knobs too.

Just throwing out a possibility....

Could the metal shaft for the volume be picking up EMI from the transformer coupling the hum to the Pot? Could you try replacing it with wood as an experiment?

But the project was very well executed.

waltson · 10th January 2005, 06:23 PM

Thanks to your kind words everybody.
This was my first time working with aluminium, and I only had tools for woodwork, so the quality and precision is not first class.

Quote:

Originally posted by rabstg

Could the metal shaft for the volume be picking up EMI from the transformer coupling the hum to the Pot? Could you try replacing it with wood as an experiment?

I tried removing the whole shaft, and it didn't change anything, so I guess that's not the case.

troystg · 10th January 2005, 07:54 PM

There goes that theroy out the window...

homer09 · 10th January 2005, 11:55 PM

great job! very classy

how did you get leds on the knobs, are those DIY or bought? And the lettering, what did you use?

once again, great job.

aditaquil · 11th January 2005, 12:09 AM

The beautiful.....

The hum it may came from PSU cable for R ch that close to pot. You could move that cable and make a new hole below.

BTW it's still beauty .

StalfoS · 11th January 2005, 03:40 AM

beautiful...

did you make the knobs and case from scratch?

Coulomb · 11th January 2005, 03:53 AM

Actually, I think the Hum is because of a difference in ground potential. Your transformer clamp appears to be magnetically shorting the windings to ground. I do not see the prerequisite rubber spacer/insulator under the metal clamp.

Try unbolting the transformer and lifting it off the chassis temporarily, put the metal washer aside and see if that effects the Hum.

Regards

Anthony

10th January 2005, 04:41 PM	#1
waltson diyAudio Member Join Date: Oct 2004	Another finished brianGT GC. This is my new amplifier: HV1! It's made of standard brianGT boards and sheets of 5mm aluminium. The pot is Alps 10K log, and the selector switch is made by Elma. I think the sound is good, except for a slight hum that you can hear if you put your ear close to the speaker. Pictures: Image 1 Image 2 Image 3 Image 4 Image 5

10th January 2005, 05:16 PM	#2
wim diyAudio Member Join Date: Sep 2003 Location: Nootdorp, Netherlands	In one word.... beautyfull, especialy the leds in the knobs!! Great job. __________________ Als er "X" artikelen benodigd zijn, blijken er "X" - 1 in voorraad te zijn.

10th January 2005, 05:47 PM	#3
ble0t diyAudio Member Join Date: May 2004 Location: Milwaukee, WI	Very nice work __________________ gravity always wins

10th January 2005, 06:08 PM	#4
troystg diyAudio Member Join Date: Apr 2004 Location: Lousy Anna	Hey Waltson- Beautiful. Love the leds in the knobs too. Just throwing out a possibility.... Could the metal shaft for the volume be picking up EMI from the transformer coupling the hum to the Pot? Could you try replacing it with wood as an experiment? But the project was very well executed. __________________ Troy Thinking positive doesn't make things better, it makes you a better person.

10th January 2005, 07:54 PM	#6
troystg diyAudio Member Join Date: Apr 2004 Location: Lousy Anna	There goes that theroy out the window... __________________ Troy Thinking positive doesn't make things better, it makes you a better person.


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10th January 2005, 11:55 PM	#7
homer09 diyAudio Member Join Date: Jan 2004 Location: Montreal	great job! very classy how did you get leds on the knobs, are those DIY or bought? And the lettering, what did you use? once again, great job.

11th January 2005, 12:09 AM	#8
aditaquil diyAudio Member Join Date: Oct 2004	The beautiful..... The hum it may came from PSU cable for R ch that close to pot. You could move that cable and make a new hole below. BTW it's still beauty .

11th January 2005, 03:40 AM	#9
StalfoS diyAudio Member Join Date: Jan 2005 Location: Vancouver, British Columbia	beautiful... did you make the knobs and case from scratch?

11th January 2005, 03:53 AM	#10
Coulomb diyAudio Member Join Date: Jul 2002 Location: Ancaster, Ontario	Actually, I think the Hum is because of a difference in ground potential. Your transformer clamp appears to be magnetically shorting the windings to ground. I do not see the prerequisite rubber spacer/insulator under the metal clamp. Try unbolting the transformer and lifting it off the chassis temporarily, put the metal washer aside and see if that effects the Hum. Regards Anthony __________________ I like to stay current!

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