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SilentSwitcher - mains-free +/-15V and 6/5/3.3V power

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#61
I can't think of any interesting opamps that work at +/- 12V that don't work at +/- 15V. There's a few +/-5V (ADA4897 comes to mind), but we rarely need to work in low power for audio. Some of the high analog output audio DACs would certainly benefit from a good +/- 5V line though (I might be mis-remembering the AKM449x series, though, might just need 0V and +5V).
 
#63
Interested in +/- 5V version

jan.didden said:
I need some opinions. I have looked at providing custom output voltages on the 'analog' outputs. The current version has +/-15V, but I could for instance provide a version for +/-12V and a version for +/-5V. They would all have the same 6.5/5/3.3V 'digital' output though.

Output currents on the analogs would increase roughly in proportion to the lower voltages.

If there is enough interest I can probably do it within the existing price structure; there is some additional one-time cost but I can absorb that.

Any interest in these custom versions?

Jan
Click to expand...
 
#64
I'm using one to power the
Soekris Engineering ApS, Products dam1021

This one would be happy with +-7-15V DC , so currently I do use the +/-15V. As the DAC consumes ca 800mA from positive rail I am stretching the limits the the SilentSwitcher here. So I would take one with +/-9V or +/-12V if you get some other requests for either. Would make life bit easier for the SS module.

***
pixelpusher - I do run two off of a Sony powerbank CP-S15.
One SS supplies the BPBP preamp (with MAYA and relay volume kit) and other SS supplies the Soekris DAC. Works fine... I just had to upgrade the power bank from some no name one as the prior was not able to supply enough current and shut itself down whe I connected both devices.
 
#65
I second the need for +/-9V as that is what the CS3318 needs.

I would prefer an adjustable version as I would want to use the same Silentswitcher with different projects. I don't always know at time of purchase what circuitry it will be used with, it's just a very nice thing to have in the partbin.

Could you look into using LDOs where the output voltage can be adjusted by changing the feedback resistor?
 
#68
These are my measures I did take manually and CNC-d to back plate. These measures did fit well enough.
(SS is the USB input on bottom right...)
 

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#70
This is bit better perhaps. The dotted line shows the PCB outer dimension. Not sure why I could not get these dotted lines visible on the Fusion 360 in my work PC. Now in home PC it does show them as it should.
 

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#72
ergo said:
This is bit better perhaps. The dotted line shows the PCB outer dimension. Not sure why I could not get these dotted lines visible on the Fusion 360 in my work PC. Now in home PC it does show them as it should.
Click to expand...

Thanks Ergo, I just hadn't gotten around to post it. Can I use it, with proper attribution of course!

BTW the hole pattern seems OK but my CAD repeots the PCB size as 32 x 55 mm instead of your 56. Then again, what's a millimeter between friends ;-)

BTW I am looking at providing a version where you can change the outputs by replacing 4 size 1206 SMD resistors. Should be doable right?

Jan
 
#74
jan.didden said:
Thanks Ergo, I just hadn't gotten around to post it. Can I use it, with proper attribution of course!

BTW the hole pattern seems OK but my CAD repeots the PCB size as 32 x 55 mm instead of your 56. Then again, what's a millimeter between friends ;-)

BTW I am looking at providing a version where you can change the outputs by replacing 4 size 1206 SMD resistors. Should be doable right?

Jan
Click to expand...
Doable replacing 4 SMD resistors. 🙂

My SilentSwitcher measures 32.3 x 56 mm and is small enough! 😀
 
#76
jan.didden said:
Thanks Ergo, I just hadn't gotten around to post it. Can I use it, with proper attribution of course!

Jan
Click to expand...

Sure, but give me a weekend and I'll tidy it up a bit and make all lines solid lines etc. I used my caliper and yes my boards are still 56mm too. PCB houses are very precise when doing traces but the cutouts are done with bit more reserve sometimes.
 
#80
Setting the voltage by replacing some resistors is fine. Do you intend to make the switching preregulator at a fixed voltage so that there we will need to consider heat dissipation in the LDOs, or could you make the switchers tracking the output?
 
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