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

[bohrok2610]

Here is a short user guide. Mostly a summary of information already posted in this thread.
/Martti

 

[namghiwook]

I've received my package.
Thank you!

 

[BDP]

Silent switcher fit nicely in a tight space for a Pearl 3. The 15-volt regulators were removed and in/out pads Jumper'd. It is very quiet. Only had a brief listen so far.

 

[6L6]

🙂 🙂 🙂 That's gorgeous! I'm looking forward to receiving mine, SSXL + Pearl 3 is one of the first applications I'll use!

 

[mhenschel]

@BDP
what PSU did you use?
did you keep the stock C18 and 19?

 

[6L6]

C18 C19 appear to be stuffed. They are the kit parts.

 

[BDP]

I'm using a 20 watt Apple PD cube.
Yes, I left the capacitors. Maybe a resistor instead of a jumper would give some additional filtering, but it's very quiet.

 

[bohrok2610]

Regarding load capacitance on +/- supply what Jan Didden stated about the original SilentSwitcher applies also to the new one:
https://www.diyaudio.com/community/...ee-15v-and-6-5-3-3v-power.297147/post-6616614

Large load capacitance (above 500uF) may cause high inrush current and does not actually improve performance. SilentSwitcher has sufficient decoupling at +/- output. Small load capacitance (e.g. 10-220uF) can be added if needed.

 

[bohrok2610]

The output connectors provided with the boards are Molex KK254 series. These are polarized to prevent misconnections.

Here are Mouser part numbers for the matching plugs from Molex:
2-pin plug: https://www.mouser.fi/ProductDetail/Molex/22-01-3027?qs=cRUT3GdJqnwywyFd19%2BSsA==
3-pin plug: https://www.mouser.fi/ProductDetail/Molex/22-01-3037?qs=cRUT3GdJqnw5IA1z0J2xqA==
Pin: https://www.mouser.fi/ProductDetail/Molex/08-51-0108-Loose-Piece?qs=8%2Bu/V6/T1OrE67rmlr2KVw==

A crimping tool is required. I use this type:
https://www.partco.fi/en/tools-and-handtools/crimp-tools/rest-of-crimp-tools/11353-ht213.html

 

[Radian]

Silent switcher fit nicely in a tight space for a Pearl 3. The 15-volt regulators were removed and in/out pads Jumper'd. It is very quiet. Only had a brief listen so far.

Great job.
Are those opamps in the signal path?

 

[Hearinspace]

Can the two +/- 15V outputs be connected in parallel for a 30V supply. If they can, can the 0V of each be left to float?

Thanks

 

[jan.didden]

You mean, "can they be connected in series for 30V?

Yes they can. But note that the center of that 30V (the gnd of the +/-15) is connected to the gnd of the USB input voltage.
So if you do that, feed them from a floating USB DC source, like a charger .

Jan

 

[Hearinspace]

You mean, . . .

Well, no, I was looking at the two output footprints on the board and thinking if each was +15 / 0 / -15 = 30V total , that being connected in parallel would allow for greater current draw and /or less heating of individual components on the board. Am I anywhere near the mark on that?

 

[bohrok2610]

Those connectors are already in parallel so each connector (or both together) has the same current capability.

By changing resistors it is possible to have +/-30V output from those connectors but available current would be lower. I have tested the boards with +/-24V output and available current was at least 200mA. Input voltage needs to be at least 9V, preferably 12V or even 15V.

 

[Hearinspace]

Those connectors are already in parallel

Ah, That's what I didn't know. I just want 30V total so the board as supplied will do the trick. Thanks !

 

[mhenschel]

@Hearinspace
did you get your order in before the strike or after?
when did it arrive?
I placed my order a few days after the strike started and I'm still waiting. :-(