AudioSector-chip amp kits, dacs, chassis - Page 88

karma · 1st March 2006, 07:05 PM

here ya are peter. i added a little glass to the dac.

its kinda like the decware zbox. but with only one source the dac
dac sounds the same just a little more base. and it runs on a batterys so there no humm.

its funny all the resisters i used on it are leftovers from my lm4780
kit

i need to add a ac plug and a relay for charging the battery
and its finished

cheers.

karma · 1st March 2006, 07:07 PM

hmm inards

karma · 1st March 2006, 07:09 PM

warm glow

and its allso single ended

later

hayena · 2nd March 2006, 02:26 PM

to everyone:

i build an integrated amp, based on Peter's SE kit. Have two 1500mF on rectifier board and two 100mF MKPs per each amp channel.

I experience quite anoying amount of RF noise comming to the speakers. The power grounds should be OK (ground star with 10ohm rezistor)
....maybe the wires from big caps?

also, it seems to be influenced by the level of attenuation...

have anyone some idea, how solve the problem?

Peter Daniel · 2nd March 2006, 02:44 PM

If it's influenced by the level of attenuation, it may be generated by your source. When you turn the volume down completely, how is it?

hayena · 2nd March 2006, 03:38 PM

forgot the picture

hayena · 2nd March 2006, 04:04 PM

When the volume is completely down, the RF is most significant. Yestarday, I changed the stepped attenuator for Nobel pot, but nothing changed....

I had idea, that the cap wires might be too long (around 2 inch). Could it act as an antenna? Or is it rather on the signal path side?

Peter Daniel · 2nd March 2006, 04:35 PM

The best way to figure out if it's from the caps would be installing temporarily some electrolytics on amps board, like 1000uF perhaps, and see what happens.

hayena · 2nd March 2006, 05:03 PM

Thanks Peter. I'll try it

karma · 2nd March 2006, 05:57 PM

wow those are hefty caps

2nd March 2006, 02:26 PM	#874
hayena diyAudio Member Join Date: Jan 2005 Location: Praha	RF noise in my interated to everyone: i build an integrated amp, based on Peter's SE kit. Have two 1500mF on rectifier board and two 100mF MKPs per each amp channel. I experience quite anoying amount of RF noise comming to the speakers. The power grounds should be OK (ground star with 10ohm rezistor) ....maybe the wires from big caps? also, it seems to be influenced by the level of attenuation... have anyone some idea, how solve the problem? __________________ hayena

2nd March 2006, 02:44 PM	#875
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	If it's influenced by the level of attenuation, it may be generated by your source. When you turn the volume down completely, how is it? __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

2nd March 2006, 04:04 PM	#877
hayena diyAudio Member Join Date: Jan 2005 Location: Praha	When the volume is completely down, the RF is most significant. Yestarday, I changed the stepped attenuator for Nobel pot, but nothing changed.... I had idea, that the cap wires might be too long (around 2 inch). Could it act as an antenna? Or is it rather on the signal path side? __________________ hayena

2nd March 2006, 04:35 PM	#878
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	The best way to figure out if it's from the caps would be installing temporarily some electrolytics on amps board, like 1000uF perhaps, and see what happens. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

2nd March 2006, 05:03 PM	#879
hayena diyAudio Member Join Date: Jan 2005 Location: Praha	Thanks Peter. I'll try it __________________ hayena

2nd March 2006, 05:57 PM	#880
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	wow those are hefty caps __________________ http://www.karmaelectronics.info

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