Does an .FPD file exist for that front panel? If you want to share it of course. How about an online Mouser BOM?
Freecrowder,
The FPD files that I give away are very similar (altho not identical) to what Ashley used.
As to an online Mouser BOM, none exist that I know of, however the project BOM gives Mouser and Digikey part numbers that are easily mapped in.
The FPD files that I give away are very similar (altho not identical) to what Ashley used.
As to an online Mouser BOM, none exist that I know of, however the project BOM gives Mouser and Digikey part numbers that are easily mapped in.
Does anyone know if there are other opamps out there that would retain the very low noise design?
I thought the LM4562 has better stated specs than the NE5532. Why do you consider the NE5532 better? Not looking to start a debate. Just looking for a bit of education.
Will the NE5532 be a drop in replacement? No component value changes. Haven't I read in some of the past posts that the noise levels will go up with the 5532.
At low frequencies noise density is lower with NE. Overall LM is better.
P.S. NE is the noise king, LM is the THD king ;-)
P.S. NE is the noise king, LM is the THD king ;-)
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The NE5532 or LM4562 ...
Both the NE5532 and LM4562 work well in this design. However the NE5532 has a real advantage on price ...
The NE5532 goes for $1.00
The LM4562 $3.00 (ie: 3 times as much as the NE5532)
Both the NE5532 and LM4562 work well in this design. However the NE5532 has a real advantage on price ...
The NE5532 goes for $1.00
The LM4562 $3.00 (ie: 3 times as much as the NE5532)
$1 versus $3 X the number of op-amps needed for the design, in a hobbyist build is, IMO, not a relevant consideration esp when the main focus on this website are "boutique" parts.
I concede that the cost difference is crucial in a manufacturing setting, where the final cost to consumer due to markup is a large multiple (9 times, often) of the cost of parts. However, this is not a manufacturing situation.
I concede that the cost difference is crucial in a manufacturing setting, where the final cost to consumer due to markup is a large multiple (9 times, often) of the cost of parts. However, this is not a manufacturing situation.
OK through with the part selection. Much more important is there any type of back panel design out there for this.
Glad I chose the NE5532. Generally speaking, I don't automatically associate highest spec opamps (or dac chips) with highest sound quality.
Front & back panels
Maybe these will help.
(& yes, you can just do a straight swap of NE5532 for LM)
OMEG 4k7 lin dual pot update (UK builders). CPC-Farnell now are saying delivery is now not until mid October.
Maybe these will help.
(& yes, you can just do a straight swap of NE5532 for LM)
OMEG 4k7 lin dual pot update (UK builders). CPC-Farnell now are saying delivery is now not until mid October.
OK promise I'll stop asking so many ?'s. Is the BOM 13_02 the latest up to date for boards that I received last week? There must be a later version of the power supply from the look of my PS board.
The latest BOM is v13.03 and is here: Dropbox - DSelf_PREAMP_BOM_v13_03.zip
The power supply is here: Dropbox - SERIES VREG_FIXED_PWR_SUPPLY.zip
Hi Mr. Huff,
interesting power supply. Do you know how many ripple and noise is at the output with 300mA load?
I don't know but it's got to be low. The described power supply is an adaptation of a long proven series regulated design. Over the years it has become my 'go to' power supply for my analog audio projects.
I always have these PCBs on hand and would be glad to share should you be interested.
Attachments
Nice board but not useable with my preamp kit with EU/UK 230v mains without some crude mods. Could you perhaps allow for connecting the primaries in series as well as parallel?
Also, the pin outs of the transformer don't correspond with any similar ones commonly available over here (eg Vigortronix). It should be possible to add additional holes to allow for this and increase the appeal to EU/UK buyers.
Have you considered the LT3015 / LT1965 low noise linear regs from Texas?They are 5pin TO220 and adjustable so here's the opportunity to update your design, allow for other transformers and 115/230v ac input!
I had been told by others that this transformer (or it's pinout equivalent) was easily available in the EU/UK ... No???
If there is enough interest I can easily add the 114/230v jumper mod to the PCB.