Gaucho said:
I would not have much hope on the burn-in improving the treble.
The LT1113 has a very limited slew rate.
Rc4560
I just replaced the OPA2227s and OPA2228s with RC4560s from TI.
They are a fairly new product. They sound very good. And they are quite a bit more stable the OPA2228s in my application.
I just replaced the OPA2227s and OPA2228s with RC4560s from TI.
They are a fairly new product. They sound very good. And they are quite a bit more stable the OPA2228s in my application.
carlosfm said:
I did check the specs before I bought it. I've never used an op-amp this slow before but I was trying to keep an open mind, so bought it anyway. Slow as it may be, the treble is better then alot of faster chips...even without burn-in.😎
Gaucho said:
Yes, I agree with you.
Specs are a very rough reference.
You really need to listen.😉
Btw, try the AD847.
I'm not going to suggest you to try the AD815.😀
carlosfm said:
Checking the specs for the 847 I see it is the single of the AD827...the 827 is already on my list! 😀
Gaucho said:
Personally I actually very like AD8xx in I/V circuits in cd players.When using in conjunction with opa627 (filters+out) it is allow to avoid "dark sound" .
off-top
Question for Carlos.
When you remove normal diodes and install hexfreds,are you removing also parrallel ceramic caps or not?
I was doing some experiments with this very thing the other day. With good diodes the sound is better without the caps and with cheap diodes the sound is much better with the caps. IMO the best result comes from using good diodes solo.
Off-topic but important!
Anthony, I've been very impressed with ON semiconductor's MUR ultra-fast diodes. The MUR110 is excellent.
You may want to try ON semi's MUR860. The recovery time (at 50 ns) is somewhat slower then the Fairchild but I personally don't get to hung up on that one parameter.
If you try both please let us know the results.
Anthony, I've been very impressed with ON semiconductor's MUR ultra-fast diodes. The MUR110 is excellent.
You may want to try ON semi's MUR860. The recovery time (at 50 ns) is somewhat slower then the Fairchild but I personally don't get to hung up on that one parameter.
If you try both please let us know the results.
Yes, 50 nS diodes are mandatory for rectifiing of 60 Hz. Which diodes are you using for 200 kHz switching supply ? Some pS ones ? 😀 Jesus !
Member
Joined 2004
Fast Diodes
You do not need to use fast recovery diodes for standard line frequency(50/60hz) power supplies ...This is utter nonsense.It sets a bad example for newbies who want to learn good design principles.Please retract these psuedo-science mutterings at once!!!
You do not need to use fast recovery diodes for standard line frequency(50/60hz) power supplies ...This is utter nonsense.It sets a bad example for newbies who want to learn good design principles.Please retract these psuedo-science mutterings at once!!!
All hifi is now contaminated by similar nonsenses, which bring people with very small knowledges and practical experiences. " Superamp " don't make " superdevices ", but clever connecion, but it is " long way " and today's people like " fast solutions ". 😉
Member
Joined 2004
A chip Amp on steroids!
I used one of these Power Op-amps for a Subwoofer project using a Dayton Titanic-MK111
http://eportal.apexmicrotech.com/mainsite/products/pages/op_amps/pa03.asp
I used one of these Power Op-amps for a Subwoofer project using a Dayton Titanic-MK111
http://eportal.apexmicrotech.com/mainsite/products/pages/op_amps/pa03.asp
Re: Fast Diodes
I suppose you also think that an over specified power supply with large cross sectional area cabling, ie 50mm2, from street to the transformer, and reduction of contact resistance through out the mains path to reduce the source impedance to the minimum is nonsence too and no effect what so ever on the music.
And having a huge low efficiency transformer that doesn't saturate even with all that capacitance after it is pointless.
And using at least 50,000 micro farads and smooth foil rather than etched foil main reservoir e-caps is pointless too.
Many people on this forum, myself included, know by their own extensive testing and listening over many years that these things make a big big difference for the better. Some people also have the maths and physics to have at least some idea why.
You are evidently devoid of this enlightenment. But that doesn't stop you insulting a whole load of us!
RCBandwidth said:
I suppose you also think that an over specified power supply with large cross sectional area cabling, ie 50mm2, from street to the transformer, and reduction of contact resistance through out the mains path to reduce the source impedance to the minimum is nonsence too and no effect what so ever on the music.
And having a huge low efficiency transformer that doesn't saturate even with all that capacitance after it is pointless.
And using at least 50,000 micro farads and smooth foil rather than etched foil main reservoir e-caps is pointless too.
Many people on this forum, myself included, know by their own extensive testing and listening over many years that these things make a big big difference for the better. Some people also have the maths and physics to have at least some idea why.
You are evidently devoid of this enlightenment. But that doesn't stop you insulting a whole load of us!
Re: Off-topic but important!
Have you tried the IXYS 68 amp <35ns bridge? I just bought one from Michael Percy. Not tired it yet.
Gaucho said:
Have you tried the IXYS 68 amp <35ns bridge? I just bought one from Michael Percy. Not tired it yet.
Member
Joined 2004
Fast diodes(the sequel)
Please explain to me in a scientific way how a fast recovery diode helps in your power supply.If we assume full wave rectification (@60hz) circuit,The filter capacitors will be charging at a frequency of 120hz,having a fast rectifier cannot speed up this rate of charging.Please enlighten me..
Please explain to me in a scientific way how a fast recovery diode helps in your power supply.If we assume full wave rectification (@60hz) circuit,The filter capacitors will be charging at a frequency of 120hz,having a fast rectifier cannot speed up this rate of charging.Please enlighten me..
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