Well that was fun, 1st part done, populated two boards.
Used a square 2.2µF capacitor for neatness. Doubt I'll notice difference
KEMET Part Number: R60QW42205030KR60, Film, Metallized Polyester, Automotive Grade, 2.2 uF, 10%, 1000 VDC, 85°C, Lead Spacing = 37.5mm
"Typical applications include blocking, coupling, decoupling, bypassing and interference suppression in low voltage applications"
I have some audio ones as well to try/compare. do let me know if these are totally unsuitable and/or others that are square
I had to bend the pins for 2 of the Nichicon KZ Muse 100µF capacitators as per photo 2 so they fitted properly
Used a square 2.2µF capacitor for neatness. Doubt I'll notice difference
KEMET Part Number: R60QW42205030KR60, Film, Metallized Polyester, Automotive Grade, 2.2 uF, 10%, 1000 VDC, 85°C, Lead Spacing = 37.5mm
"Typical applications include blocking, coupling, decoupling, bypassing and interference suppression in low voltage applications"
I have some audio ones as well to try/compare. do let me know if these are totally unsuitable and/or others that are square
I had to bend the pins for 2 of the Nichicon KZ Muse 100µF capacitators as per photo 2 so they fitted properly
Attachments
Um.... need to change them then?
Here are some numbers for dissipation factor (DF), smaller is better:
Polyester (PETP) .5%
Polycarbonate .05%
Polyphenylene sulfide (PPS) .05%
Polystyrene .05-.02%
Polypropylene .025-.01%
Teflon (PTFE) .025-.01%
These numbers were culled from over 100 documents on the web.
from metalized polypropylene vs metallized polyester? | Headphone Reviews and Discussion - Head-Fi.org
Shame I liked the look of them on the board......
Here are some numbers for dissipation factor (DF), smaller is better:
Polyester (PETP) .5%
Polycarbonate .05%
Polyphenylene sulfide (PPS) .05%
Polystyrene .05-.02%
Polypropylene .025-.01%
Teflon (PTFE) .025-.01%
These numbers were culled from over 100 documents on the web.
from metalized polypropylene vs metallized polyester? | Headphone Reviews and Discussion - Head-Fi.org
Shame I liked the look of them on the board......
The box capacitor that fits exactly into the space for C3 is the Wima MKP
Mouser #:505-M102.2/400/10P
Mfr. #: MKP1G042207E00KYSD
though I normally end up fitting an axial type, which is why there's the second set of wirepads outside of the box outline.
Mouser #:505-M102.2/400/10P
Mfr. #: MKP1G042207E00KYSD
though I normally end up fitting an axial type, which is why there's the second set of wirepads outside of the box outline.
Hi Richard.
Tested with lyra mc cartridge.
Emerald performs very well.
What should i change for if recomended input impedance is 400 and gain need to be 72db?
Thank you.
Tested with lyra mc cartridge.
Emerald performs very well.
What should i change for if recomended input impedance is 400 and gain need to be 72db?
Thank you.
Enclosure layout
I have found a nice sized box(whd 215x55x308 external, 203.5x48x297 internal), not ideal to have transformer in same box but is neater. I worry about mains hum, so....
Two choices now, Put Transformer furthest away from the rear and the mains input, and hence shortest phono connections or vice versa?
picture is where the transformer is furthest away, putting phonos on same back panel as the mains input.
I have found a nice sized box(whd 215x55x308 external, 203.5x48x297 internal), not ideal to have transformer in same box but is neater. I worry about mains hum, so....
Two choices now, Put Transformer furthest away from the rear and the mains input, and hence shortest phono connections or vice versa?
picture is where the transformer is furthest away, putting phonos on same back panel as the mains input.
Attachments
@keland
A long thin chassis will always present this dilemma. I recommend to keep the standard position of the connectors in the back, bringing the AC line from the rear socket to a front power threading the wire down the side of the chassis and keeping the transformer and diodes in the front, with the PCBs at the rear close to the input RCA jacks. A metal divider or box enclosing separating the AC power line from the PCB may help with noise pickup, but a lot of the coupling is inductive, so it won't be a definitive solution.
@AnthonyA
R2 = 400 ohms, R3 = 15 ohms Your gain setting is on the high side, circuit noise will increase proportionately.
A long thin chassis will always present this dilemma. I recommend to keep the standard position of the connectors in the back, bringing the AC line from the rear socket to a front power threading the wire down the side of the chassis and keeping the transformer and diodes in the front, with the PCBs at the rear close to the input RCA jacks. A metal divider or box enclosing separating the AC power line from the PCB may help with noise pickup, but a lot of the coupling is inductive, so it won't be a definitive solution.
@AnthonyA
R2 = 400 ohms, R3 = 15 ohms Your gain setting is on the high side, circuit noise will increase proportionately.
Hi Richard. Thank you
There is already a little radio freq entering it any other suggestions? Should I add a ferrite to ground
And add a ac filter block?
There is already a little radio freq entering it any other suggestions? Should I add a ferrite to ground
And add a ac filter block?
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RFI needs trial and error troubleshooting. Try different things, see what works.
An capacitor across the inputs may do the trick, or an RFI filter on the AC line, or better shielding or cable dressing in the case, or a better shielded phono cable.
An capacitor across the inputs may do the trick, or an RFI filter on the AC line, or better shielding or cable dressing in the case, or a better shielded phono cable.
Hello Richard,
Just finished my Emerald and I must say it sounds great with my DL-103. It is a big step up from the Mani I was using.
Thanks for making your designs available!
Just finished my Emerald and I must say it sounds great with my DL-103. It is a big step up from the Mani I was using.
Thanks for making your designs available!
I finally managed to finish my Emerald phono stage yesterday afternoon. It's a bit of a revelation tbh! My Benz Wood which I though was worn out sounds ace ( there's a joke in there somewhere ) I'll post a few pics as soon as I get the chance.
A big thank you Richard.
A big thank you Richard.
A couple of pics of my Emerald. I cut a Naim case in half and welded a strip to each half of the sled. Each half was just big enough to get the boards in. I've lost the pics of the finished units so i'll have to post them later.
My Emerald boards are ready for power up. I did not find instructions on how to setup the Emerald phono stage boards from powering them up and biasing if any required. Also not sure what is the purpose of that trimmer on each of the mono board.
Can someone let me know the instructions of powering them up from the bridge rectifiers where I have a +/-12VDC. What should I check if the boards are working fine before I connect to the turntable.
Thanks
Can someone let me know the instructions of powering them up from the bridge rectifiers where I have a +/-12VDC. What should I check if the boards are working fine before I connect to the turntable.
Thanks