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Old 9th September 2011, 08:49 AM   #17401
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by Ben Hanke View Post
The 4 with Silmics put out 5.2v and the 4 I built last night with solid tantalum all put out a solid 5.02v.

Interesting, huh? I didn't have to change the resistor value or swap in the red LED or anything, and they're bang on.
That has everything to do with the large capacitive load of the 100uF caps. If the impedance at the output gets too low (= large cap) the regulating loop looses track. You can read all about it here and here. Try and load them with a 470 ohm resistor. I bet they will give 5.0V as well then.

Regards,

Ray
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Old 9th September 2011, 09:19 AM   #17402
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Any reason for choosing carbon and not metal film? I've used the metal film ones previously but I've no idea how they compare. Did you go for half watt?
I use metal film at the moment and have found them to be very good but I fancied trying these. I heard them around a HA in a cutomers cdp and thought they sounded very natural. 1/4 watt.

Brent
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Old 9th September 2011, 03:59 PM   #17403
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Fully populated the pcb with some of the parts from my old DOS. I had to trim the end of the pcb to fit in my player due to the RCA sockets and SPower regs on the dac analogue.

Click the image to open in full size.

Just need to install it which will likely be Monday.

Brent
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Old 9th September 2011, 04:08 PM   #17404
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Nice work Brent!
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Old 9th September 2011, 04:11 PM   #17405
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Looking good, Brent. What are those four black cylinders between the silver micas?
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Old 9th September 2011, 04:20 PM   #17406
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Cheers Ray & Ben.

They are the 10mH inductors. Good quality ones from Jabdog.

I've decided to stay a little later at work and install it

Brent
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Old 9th September 2011, 04:21 PM   #17407
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Please do!
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Old 9th September 2011, 04:26 PM   #17408
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It's in. Running now

Can't say what diffs there are yet as the player takes ages to settle and I need it on my home system. If there is one thing that maybe different from cold is I think the bass is a little tighter.

Time will tell

Brent
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Old 9th September 2011, 04:45 PM   #17409
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That was quick! To soon to tell indeed, but it's always nice to see/hear everything is running fine. I hope you enjoy it!

Ray
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Old 9th September 2011, 04:52 PM   #17410
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Things always run properly Ray you should know that

I'm about to leave work but what I can say there is no step backwards at all in sound quality which to be honest I didn't expect.

It will have plenty of running in tonight and over the weekend

Brent
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