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Old 1st March 2006, 08:05 PM   #871
karma is offline karma  Canada
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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.
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Old 1st March 2006, 08:07 PM   #872
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hmm inards
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Old 1st March 2006, 08:09 PM   #873
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warm glow

and its allso single ended

later
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Old 2nd March 2006, 03:26 PM   #874
hayena is offline hayena  Czech Republic
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Default 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?
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Old 2nd March 2006, 03:44 PM   #875
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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?
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Old 2nd March 2006, 04:38 PM   #876
hayena is offline hayena  Czech Republic
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forgot the picture
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Old 2nd March 2006, 05:04 PM   #877
hayena is offline hayena  Czech Republic
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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?
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Old 2nd March 2006, 05:35 PM   #878
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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.
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Old 2nd March 2006, 06:03 PM   #879
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Thanks Peter. I'll try it
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Old 2nd March 2006, 06:57 PM   #880
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wow those are hefty caps
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