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Old 29th March 2006, 12:35 PM   #1511
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Quote:
Originally posted by philpoole
Hi Brent,

How close are you going to put these caps to the opamps?
Can you get them on the browndogs?

Cheers,
Phil
I WILL get them on browndog. Should be able to solder them on top

I am going to try a 4x OPA627 setup first to compare and then bypass.

Should get op amps tomorrow from Farnell (I have a few spare browndogs just waiting for them)

Brent
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Old 29th March 2006, 01:06 PM   #1512
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I now have all the bits for the discrete output stage - inspired by Ray (there are differences, for starters, his works, lol).

Really hoping to get it done soon, but never getting the chance to fire up the iron.

Ray, what kind of bypassing are you doing on your output stage?
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Old 29th March 2006, 01:15 PM   #1513
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Quote:
Originally posted by philpoole
I now have all the bits for the discrete output stage - inspired by Ray (there are differences, for starters, his works, lol).

Really hoping to get it done soon, but never getting the chance to fire up the iron.

Ray, what kind of bypassing are you doing on your output stage?
Can't wait to see the results mate.

I also noticed you have the lovely Yamaha DSP-E800, I replaced all 6 op amps with OPA2134 and the seperation and sound from satalite was like dvd. Very impressive.

Brent
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Old 29th March 2006, 01:24 PM   #1514
SimontY is offline SimontY  United Kingdom
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Good to see the thread warming up again

OT - I also have the E800 - that makes at least three of us with E800 and CD63

wooh!
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Old 29th March 2006, 01:27 PM   #1515
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That Yamaha is a cracking bit of kit isn't it?
Brent, we're getting off thread here, but what did you do to your 751s? Just the crossovers?


Cheers,
Phil
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Old 29th March 2006, 01:32 PM   #1516
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Quote:
Originally posted by philpoole
That Yamaha is a cracking bit of kit isn't it?
Brent, we're getting off thread here, but what did you do to your 751s? Just the crossovers?


Cheers,
Phil
I used better quality caps and rewired from xover to drivers with same wire as speaker wire going to it.

Better treble detail. I also filled my mission stands with sand. Bit excessive for rears but hey why not lol.

Brent
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Old 29th March 2006, 01:45 PM   #1517
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by rowemeister
FAO RAY......

The noise should be pretty low, so do you still recommend I need bypassing on the opamp pcb?

I was looking at using BG FK 16V 33uf or 47uF caps or do you recommend a different value you have found works better.

Also something like a 220nF film resistor to decouple + and - 12V, is this also advantagous.

cheers

Brent
Hi Brent,

I didn't use any decoupling directly on the BD pcb's yet , but I've put a 220n PPS cap between pins 4 and 8 on the bottom of the player's PCB. I have replaced the original electrolytics with 220u/16V BG's. I'd say, give it a try and see how it sounds!

Regards,

Ray.
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Old 29th March 2006, 01:50 PM   #1518
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Quote:
Originally posted by 6h5c


Hi Brent,

I didn't use any decoupling directly on the BD pcb's yet , but I've put a 220n PPS cap between pins 4 and 8 on the bottom of the player's PCB. I have replaced the original electrolytics with 220u/16V BG's. I'd say, give it a try and see how it sounds!

Regards,

Ray.
Ray you disapoint me LOL

Ill drop in the 4x 627 to see what I prefer and then i'll try bypassing

Brent
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Old 29th March 2006, 01:57 PM   #1519
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by philpoole
I now have all the bits for the discrete output stage - inspired by Ray (there are differences, for starters, his works, lol).

Really hoping to get it done soon, but never getting the chance to fire up the iron.

Ray, what kind of bypassing are you doing on your output stage?
Hi Phil!

Doesn't work?? How's that possible ? Did you screw it up ?

For now, I use the on-board regulators for the discrete stage, which are LM317/337 BTW. Then the series inductors (220uH) and four Elna Silmics that I stole from the output caps. Sounds quite nice for a prototype .

In the definitive version I want to use Black Gates, and maybe a differential FET input stage. When my FET's arrive i'm going to start testing that.

My new CD57 arrived yesterday
Another virgin PCB waiting to be mounted....

Regards,

Ray.
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Old 29th March 2006, 01:58 PM   #1520
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by rowemeister
Ray you disapoint me LOL

Ill drop in the 4x 627 to see what I prefer and then i'll try bypassing

Brent
Hey, what can I say, i'm not into opamps anymore anyway....

Ray.
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