Oh, I see 🙂 huh well on the pcb the C1L and C2L are the same dimensions and the physical caps oddly are the same size too. I'm just using plain old Wima FKP2 caps... hopefully they are good enough... I printed out a physical sized board and matched all the parts I have to the board to make shure everything fits, the only parts I do not have are the Blackgate's which should show up soonish. I will upload a zip of my pcb and schematic (eagle) later on just in case anyone wants to tinker with it, outta time this morning 😀
Thanks a lot for clearing this up, rjm. The new layout
does make sense. You had me confused with the old one😉
Great homepage, by the way🙂
Steen.
Looks like a rather sweet setup you have there. Now I need to start on mine and see if it works 😀
Naz
Naz
Naz, what about making the layout for single opamps and go dual mono as rjm suggested? You would then be able to use the OPA637😉 Also, if the railcaps were moved closer to the chip, the circuit might perform better! Just a thought.
Steen🙂
Well I did little more tinkering with the layout.. is it better? I'm trying for a compact pcb layout. I might try to do a dual mono setup this next week, but I'm going to try and build this one and see how it performs.
Naz
An externally hosted image should be here but it was not working when we last tested it.
Naz
Naz, that looks good. Quite a compact layout. I did add a 100nF film cap after the ps electrolytics, might be worth it, if you could fit them in🙂
Did you see Noober's preamp design? Might be inspirational to you, if you intend to make a single opamp version.
http://www.diyaudio.com/forums/attachment.php?s=&postid=616123&stamp=1113103329
Nice and symmetric design😎
Steen.
Did you see Noober's preamp design? Might be inspirational to you, if you intend to make a single opamp version.
http://www.diyaudio.com/forums/attachment.php?s=&postid=616123&stamp=1113103329
Nice and symmetric design😎
Steen.
If you are using a single supply for the phono stage and preamp, and that power supply has a single rail of V volts, you can't connect the output of the phono stage, referenced to 1/2 V, to the input of the preamp if, as is most likely, the preamp's ground is referenced to the power supply ground.
c1 & c2 reversed
Sorry if this question is dumb I'm very new at this.
I built the VSPS REV.2 and when I tried it out it didn't seem to have enough gain. As I read over the old posts I saw that I had C1 and C2 reversed. What would this sound like? Could this be my trouble?
Tony
Sorry if this question is dumb I'm very new at this.
I built the VSPS REV.2 and when I tried it out it didn't seem to have enough gain. As I read over the old posts I saw that I had C1 and C2 reversed. What would this sound like? Could this be my trouble?
Tony
I have made the VSPS and built it into this preamp:
http://www.diyaudio.com/forums/showthread.php?threadid=55558
It sounds really good. Amazingly simple to build, I am quite impressed by the performance. Thanks RJM.
Steen🙂
http://www.diyaudio.com/forums/showthread.php?threadid=55558
It sounds really good. Amazingly simple to build, I am quite impressed by the performance. Thanks RJM.
Steen🙂
Hello all, first post.
Ive got a few questions with this phono. I am novice so these maybe dum questions;
Im going to have a go at this which looks simple enough. However, if I built a phono using single op-amps is it a case of just relicating the circuit for each channel? What single op-amp would you recommend?? Any help would be most grateful.
Ive got a few questions with this phono. I am novice so these maybe dum questions;
Im going to have a go at this which looks simple enough. However, if I built a phono using single op-amps is it a case of just relicating the circuit for each channel? What single op-amp would you recommend?? Any help would be most grateful.
A possible layout for single op-amps might be like the suggestion below. Here, the op-amp is on the underside of the board.
I used to have this on the VSPS page, but removed it since it was confusing people. (What? Two layouts? Huh? Which one should I pick? U..g...) 🙄
The OP27 is a safe bet to try first. AD797 if you feel adventurous, OP627 is you feel rich. AD825 if you feel inclined to mess about with SMT. LM6171 if you want to watch TV. (just kidding!) NE5534 if you want to go back to basics.
Use a socket and play around with different ones.
-R
I used to have this on the VSPS page, but removed it since it was confusing people. (What? Two layouts? Huh? Which one should I pick? U..g...) 🙄
The OP27 is a safe bet to try first. AD797 if you feel adventurous, OP627 is you feel rich. AD825 if you feel inclined to mess about with SMT. LM6171 if you want to watch TV. (just kidding!) NE5534 if you want to go back to basics.
Use a socket and play around with different ones.
-R
Attachments
Many thanks for that, its greatly appreciated. Just one more question, will the values of the components from the dual op-amp circuit relate to this too?
mono VSPS PCB group buy
Along the lines of the Phonoclone Beta Project I have put together a little PCB for the VSPS. Cuz, well, not everyone has a moving coil cartridge, okay?
It's 5x8cm, and since I can get it sent with the next Phonoclone batch order from Olimex, I can have it made up in limited numbers and still send it out for a decent price.
The cost will be $18 for two boards, which includes shipping. I know I originally said $15, but shipping is a bigger part of the total than I allowed for on my first estimate... email/pm for details.
PCB attributes:
- small size 8x5cm (I know I said that already!)
-15mm resistor lead spacing, fits just about anything
- 5, 7.5 mm RIAA cap spacing, for WIMA MKS, MKP, FKP etc, plus 15 and 20mm spacing for larger capacitors.
- output coupling cap accepts 5mm or 22.5mm components, either Black Gate or WIMA MKP or other film types.
- 3.3mm mounting holes.
- board is single sided, with solder mask and top silk screen printing.
- accepts any single op-amp you care to use, including the AD797 as I've allowed room the optional decompensation cap on pin 8, and ceramic bypass capacitors should they be needed.
Below is a picture of the pre-production silk screen, showing component layout. I've still got some tidying up to do, but you hopefully get the gist.
-R
Along the lines of the Phonoclone Beta Project I have put together a little PCB for the VSPS. Cuz, well, not everyone has a moving coil cartridge, okay?
It's 5x8cm, and since I can get it sent with the next Phonoclone batch order from Olimex, I can have it made up in limited numbers and still send it out for a decent price.
The cost will be $18 for two boards, which includes shipping. I know I originally said $15, but shipping is a bigger part of the total than I allowed for on my first estimate... email/pm for details.
PCB attributes:
- small size 8x5cm (I know I said that already!)
-15mm resistor lead spacing, fits just about anything
- 5, 7.5 mm RIAA cap spacing, for WIMA MKS, MKP, FKP etc, plus 15 and 20mm spacing for larger capacitors.
- output coupling cap accepts 5mm or 22.5mm components, either Black Gate or WIMA MKP or other film types.
- 3.3mm mounting holes.
- board is single sided, with solder mask and top silk screen printing.
- accepts any single op-amp you care to use, including the AD797 as I've allowed room the optional decompensation cap on pin 8, and ceramic bypass capacitors should they be needed.
Below is a picture of the pre-production silk screen, showing component layout. I've still got some tidying up to do, but you hopefully get the gist.
-R
Attachments
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