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Old 17th April 2007, 05:20 PM   #6401
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Quote:
Originally posted by Greg3333
For bypassing the op-amps, how critical is the cap value? I have some 0.47u/100v to hand - are these too small?

Thanks

Greg

Do you really need the caps? If your DC offset is less than 25mV you should think about leaving them away. This really improves the sound. If not, you could look at some BG caps, prefferably the HI Q N caps. They are preffered for DC decoupling. I know BG caps are not cheap, but the HI Q N caps 47uF 6,3V are only about 2,30 euro in Holland. And because you only need 2 of them I think the costs are less than the bennefit.
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Old 17th April 2007, 05:31 PM   #6402
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alcoholic, I'm referring to the small power supply bypass caps shown in this post.
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Old 18th April 2007, 12:01 AM   #6403
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yeah sorry heres the link again its the cerafine caps 100uf/35v but he does say he can get more values http://cgi.ebay.co.uk/ws/eBayISAPI.d...6495&rd=1&rd=1
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Old 18th April 2007, 07:17 AM   #6404
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You could get those for little money.... well until you advertised them

Brent
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Old 18th April 2007, 10:25 AM   #6405
Glenn2 is offline Glenn2  United Kingdom
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Elna Cerafine & Silmic - also see here.

Bypassing op-amps - I think it's only really beneficial with high-speed op-amps. Those with high gain-bandwidth product (say 50Mhz and up) and high slew-rate.

Assuming you mean connecting the cap from pin 4 to pin 8 of the op-amp.

Huge benefit for LM6172 (goes from awful to superb), did diddly-squat on the Burr-Brown slow-pokes.

Try it with and without and see which you prefer.

A good low-inductance cap (like stacked film or ceramic) is needed to tame fast chips like LM6172. Search for EPCOS B32560 as an example. I use values from 0.1uF to 1uF with success.

LM6172, AD826 and LT1364 are three that benefitted from 1uF stacked film. I posted on this a few pages back so there's more info on them back there.

Hope this helps.
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Old 18th April 2007, 11:17 AM   #6406
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heap shame and ridicule on me! (see if I care) past the 150 hr mark the LM4562 get even better: sweeter, more expansive. I implore anyone using these to WAIT before passing judgement.
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Old 18th April 2007, 11:51 AM   #6407
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AVR, any change in the AD8599?
Also, when an opamp (e.g. NE5532) oscillates, what does it sound like? A hum can be this?
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Old 18th April 2007, 02:29 PM   #6408
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An unexpected benefit of these opamps, for which I have no explanation, is that they seem somehow to restrain my Trends T-amp from clipping so easily, and when it does so, more gracefully.
This is very obvious because the T amps do not sound nice when they clip and I've had to live with that for months and keep the vol. down more than I like. If the op's mellow even more I will be in Audio bliss!
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Old 18th April 2007, 05:32 PM   #6409
avr300 is offline avr300  Denmark
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Quote:
Originally posted by Malefoda
AVR, any change in the AD8599?
Busy playing on my new baby - a DAC7 Philips CD950 with CDM9/44 mech. Pretty cool in standard trim but there will be a Flea flying 'round soon.

So it's long time ago since I have heard the CD63.
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Old 21st April 2007, 08:13 AM   #6410
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by avr300
Busy playing on my new baby - a DAC7 Philips CD950 with CDM9/44 mech. Pretty cool in standard trim but there will be a Flea flying 'round soon.

So it's long time ago since I have heard the CD63.
Hey, this DAC has external connections to the DAC's output pins
Excellent candidate for a passive filter + discrete output stage

Ray
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