Marantz CD63 & CD67 mods list - Page 151 - diyAudio
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Old 24th March 2006, 07:19 PM   #1501
poynton is offline poynton  United Kingdom
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Default Ferrites

Hi.

Ideally, ferrites / chokes should be positioned right next to the chip. [ minimum distance ]

Andy
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Old 24th March 2006, 07:20 PM   #1502
ash_dac is offline ash_dac  United Kingdom
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Default Re: Ferrites

Quote:
Originally posted by poynton
Hi.

Ideally, ferrites / chokes should be positioned right next to the chip. [ minimum distance ]

Andy
Is that your cd63 on ebay ?
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Old 24th March 2006, 07:25 PM   #1503
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two of the many !!!!!

I still have 6 left plus the '43, '53 and the numerous CD60, Seimens RA400, Kenwoods, CD303. CD104s, cd304 [1+2] etc

Oh, I forgot - the CD4000 and the 2 B&O CD-X

you can't move in my garage !
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Old 24th March 2006, 07:36 PM   #1504
ash_dac is offline ash_dac  United Kingdom
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Quote:
Originally posted by poynton
two of the many !!!!!

I still have 6 left plus the '43, '53 and the numerous CD60, Seimens RA400, Kenwoods, CD303. CD104s, cd304 [1+2] etc
..and the cdm1 mech's
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Old 24th March 2006, 07:39 PM   #1505
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by ash_dac


..and the cdm1 mech's

Didn't I mention the CDM's ? or the CD204?
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Old 24th March 2006, 10:29 PM   #1506
ash_dac is offline ash_dac  United Kingdom
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Default Use the PWM outputs?

Hi,

Would it be possible to feed the PWM outputs into a half-bridge amplifier MOSFET stage, and LPF ?

Then I wouldn't need an amp !

http://users.ece.gatech.edu/~mleach/...01/ClassD2.pdf

Or have I had too many beers!
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Old 25th March 2006, 09:32 AM   #1507
poynton is offline poynton  United Kingdom
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Default Re: Use the PWM outputs?

Quote:
Originally posted by ash_dac
Hi,

Would it be possible to feed the PWM outputs into a half-bridge amplifier MOSFET stage, and LPF ?

Then I wouldn't need an amp !

http://users.ece.gatech.edu/~mleach/...01/ClassD2.pdf

Or have I had too many beers!

Hi.

Since the balanced inpt power amp is essentially the same as a balanced input op-amp, the answer is a [ guarded ] YES !

How about incorporating a T-AMP or TDA1554 and psu inside the chassis?

Andy
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Old 25th March 2006, 11:08 AM   #1508
ash_dac is offline ash_dac  United Kingdom
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Default Re: Re: Use the PWM outputs?

Quote:
Originally posted by poynton



Hi.

Since the balanced inpt power amp is essentially the same as a balanced input op-amp, the answer is a [ guarded ] YES !

How about incorporating a T-AMP or TDA1554 and psu inside the chassis?

Andy
Hmm. Thanks Andy.

TDA1554 looks interesting, and is quite cheap. [url]

If I added sockets in the Marantz and it all went wrong I could put the old op amps back in.

T-AMP- might get one of them since I got paid today.
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Old 29th March 2006, 11:56 AM   #1509
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FAO RAY......

Ray as you know I have the OPA627 and OPA132 combo on browndogs.

I have not done any bypassing on them yet. And now is the time lol

I have the two Audiocom super regs directly on the op amps and 4 Black Gate FK 16V 470uF caps.

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
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Old 29th March 2006, 12:16 PM   #1510
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Hi Brent,

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

Cheers,
Phil
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