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Old 14th June 2006, 08:03 PM   #51
RDV is offline RDV  United States
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Quote:
Originally posted by DJ Exprice
Motorboating? What?
A non-technical term for low frequency oscillation usually caused by uneven power supply filtering.

RDV
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Old 15th June 2006, 08:33 AM   #52
matjans is offline matjans  Netherlands
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HUMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

(kiss)
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Old 21st June 2006, 08:02 AM   #53
veteran is offline veteran  Poland
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Arne (1543), can you tell more about prices - especially this front panel. Your enclosure look great!
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Old 21st June 2006, 09:24 PM   #54
1543 is offline 1543  Germany
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Hi veteran,

the frontplates were 28,70€ each and the heatsink profiles costs around 50€ for each amp.

Arne
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Old 22nd June 2006, 12:05 AM   #55
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Default CMoy Headphone Amplifier

Attached is my latest project. A CMoy headphone amplifier. It uses the OPA2132PA opamp.

On the success of this project, I want to try a desktop unit with volume control, bigger input caps, regulated power supply and bypass caps on the chip.

There are a couple more pictures and details at my website.

Overall, the CMoy performs well and it increases listening pleasure with a good set of headphones.

Cheers,
Gio.
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File Type: jpg cmoy-03.jpg (50.8 KB, 13213 views)
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Old 23rd June 2006, 05:13 AM   #56
Voltaic is offline Voltaic  United Kingdom
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Quote:
Originally posted by Malotron
Looks better covered up...

-Mal
Nice looking design, if you took those two aluminum profiles, stacked them end to end, and offset them by 12.25° it would be the profile of the patronis towers in singapore. wow, definately not an architecture student here~

Can't wait to post my GC amp, ordering the PCBs tommorrow and doing my parts-sourcing this weekend, I finally get to use this pair of 22,000uF caps I've had sitting on my bech for 3 years YAY

-cheers,
Daniel
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Old 25th June 2006, 05:36 AM   #57
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Default Rebuilt LM4780

Well after cooking the first set of chips my first Lm4780 is up and running.
This has been a long process(1 year) since I first ordered the chips from National.
This one sounds way more dynamic if i could use that term without getting too airy fairy. I think this has to do with the power supply, as this one was built with a dual mono and it is a parallel design. I used two 300va trannies and four bridge rectifiers.
I think this made all the difference, more power
Anyway its not perfect, as there are a few things I'm still sorting(tweaking) as you do..............
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File Type: jpg running in.jpg (83.7 KB, 12667 views)
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Old 25th June 2006, 05:38 AM   #58
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Default Inside

Here's a pic of the inside
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File Type: jpg ready for power hookup2.jpg (80.9 KB, 13643 views)
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Old 25th June 2006, 05:42 AM   #59
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Default Cooked chips (fish anyone?)

Here they are..............mmmmmmmmmmmm smell lovely.
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File Type: jpg old cooked chips.jpg (80.0 KB, 13026 views)
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Old 25th June 2006, 05:45 AM   #60
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Default Finally listening

And now it's working.........................yeah
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File Type: jpg setting up.jpg (83.6 KB, 13237 views)
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