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Update on Caver undspeakers http://dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=806 |
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Author: | SoundMods [ April 9th, 2017, 12:09 pm ] |
Post subject: | Re: Update on Caver undspeakers |
You might want to install a DIP socket so you can change back. On paper the the TLO74 is a much better performer. After looking at the data sheets I have to wonder why someone would recommend the the OPA4227. ??? |
Author: | tomp [ April 9th, 2017, 4:14 pm ] |
Post subject: | Re: Update on Caver undspeakers |
The OPA4227 is just an updated version of the OP27. It was a great OP Amp in its day and I built great MM and MC pre amps with the OP27 and OP37 a long time ago but there are better now. If you are looking at specs the LME49710 and LME49720 blow the OPA4227 away in almost every category. I am now using those in phono and line stages with great results. Tom |
Author: | DaveR [ April 9th, 2017, 6:48 pm ] |
Post subject: | Re: Update on Caver undspeakers |
My favorite audio op amps are the AD797 and LME49990. The AD797 can be hard to get stable depending on the circuit and the LME49990 isn't made any more. I don't believe there are any LME49990 available from an actual TI distributor. I'd be wary of sellers on eBay, especially if they happen to be located in China. |
Author: | tomp [ April 9th, 2017, 6:58 pm ] |
Post subject: | Re: Update on Caver undspeakers |
I'm using AD797s in my custom preamp. They work well but the new LME series have no problems with stability. If I were going to build it now I would use the LME. Tom |
Author: | Pelliott321 [ April 9th, 2017, 9:32 pm ] |
Post subject: | Re: Update on Caver undspeakers |
Now I am confused. kits claims the OPA is an upgrade and charge a lot for the chips. I can get them much cheaper from Digikey, etc so that's why I got the stock TL's. So this must have been just marketing BS. In stalled sockets when I built the boards so I can roll chips, but now I will not waste my time with the OPA , but do not have a clue of what to try |
Author: | SoundMods [ April 10th, 2017, 1:33 pm ] |
Post subject: | Re: Update on Caver undspeakers |
Bummer! I did some window shopping and the best Quad Op-amps for high-end audio are surface-mounted devices. Texas Instruments especially had some audio goodies that they inherited from Burr Brown when they bought out Burr Brown. They also are not cheap. |
Author: | brombo [ April 10th, 2017, 1:56 pm ] |
Post subject: | Re: Update on Caver undspeakers |
The following link may be of use for diy soldering of surface mount devices - http://www.nutsvolts.com/magazine/artic ... _soldering |
Author: | SoundMods [ April 10th, 2017, 3:43 pm ] |
Post subject: | Re: Update on Caver undspeakers |
The problem here is that Paul's device(s) has quad op-amps in a dual-inline-plug (DIP) format. The DIP format, even though it has the same pin-out as the surface-mounted devices, is much larger. I didn't do extensive shopping, but I did look at Analog Devices and Texas Instruments as my first go-to choices. There are numerous others such as Harris Semiconductor, Exar, Elantec, Signetics, National Semiconductor, etc. |
Author: | Roscoe Primrose [ April 10th, 2017, 3:46 pm ] |
Post subject: | Re: Update on Caver undspeakers |
SoundMods wrote: The problem here is that Paul's device(s) has quad op-amps in a dual-inline-plug (DIP) format. The DIP format, even though it has the same pin-out as the surface-mounted devices, is much larger. Adapters are available that you can solder the SMD to so it'll plug into the DIP socket.... Roscoe |
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