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GB for Salas Reflektor-D Power Supply for Digital

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M

moorebj

Member
Joined 2006
Signup for relector ps board and kit

Tea-Bag said:
This is a GB for Salas Reflektor-D and Reflektor-Mini Power supply.
This is a Low Voltage supply designed specifically for digital.
3.3V to 7V at 600mA max output using board level sinks.
Schematic and build info in PDF attachment at the bottom of post.

parts_pads.png


In the words of Salas -

The Reflektor concept is a shunt voltage regulator made around a current mirror circuit. To keep equal current between its input and output legs, the mirror reacts to flow disturbances and drives a MOSFET in opposite direction. A current loop simple regulator is another way to describe it. Specifically Reflektor-D is a version focusing on the voltage region common for powering digital source projects. For convenient mounting and setting it utilizes board level sinks and simple ways to choose its current limit and voltage output levels


The board is offered in a Matte Black 2MM thick PCB with 2 OZ copper. The cost is $16.00 plus shipping.

image.jpeg



It was a very easy build, it took me 45 minutes to complete and then start testing, and got near target voltages rather easily via the LED swaps.
Three different kits will be offered. A transistor kit, a resistor kit, and a full kit, which includes all parts for board except standoff parts and MOSFET bolts and nuts for the heatsink.

image-2.jpeg



The Reflektor-Mini was created to be installed into some tight spots. It is a much smaller board that will require its MOSFETS to be chassis mounted and electrically isolated for sinking. It keeps a lower height profile too. It is DC input only, needs an incoming DC feed.
It uses a J2 2SK117GR to stabilize and tune output voltage. For keeping small size It has a conventional 2Pin output. It's a slightly more complicated build than the original in some aspects and simpler in some other, but will serve it purposes in being a potentially lower cost unit to construct, as well as a smaller footprint.





In conjunction with the Mini release, the DC Flexy board is introduced. It allows for use of industry standard Snap-in Elcos or 4 pin/pole Mundrorf M-Lytic AG+. These boards can be used as Raw DC units to front end the power supply for the Reflektor-D Mini. They come in a breakable pair so to be used in double mono or multi isolated configurations of more than one regulator to feed. if used in a system of one regulator only, the spare may be broken off and kept aside since it can be utilized in a variety of projects needing Raw DC. Even for the standard Reflektor-D when done in its DC input mode version.

DCFlexy.jpg


The signup for the boards is in my signature.
Click to expand...
Please sign me for 2 kits and boards Mike
moorebj
 
Salas

Salas

diyAudio Chief Moderator
Joined 2002
Paid Member
The IRF9610 is a 6.4 C/W RthJC MOSFET. You would not want more than 100C at its core in the long run for reliability. Assuming 5-10V VDS across it. You could try a FAIRCHILD FQP3P20-ND for more than 1A constant which is still fast but has 2.4 C/W junction to case thermal. Spec is absolute max constant -1.77A at TC=100C. Still check with the oscilloscope that the output rail is oscillation free. Because it has more Ciss than the 9610 but not that much, +80pF. Just to make sure all is well. The output MOSFET wouldn't worry, its strong enough and its partially unloaded by the current sent to the powered client circuit.
 
dwjames

dwjames

Member
Joined 2012
Kits received thank you :)

please could you explain with the 2SK117GR, you have included 2 pcs and one has been measured and marked. Is this measured one intended for J1 or J2 on the reflektor-d mini?

edit---- I guess it's the IDSS so it's for J1 to help determine the value of RR right?

thanks,
James
 
Last edited:
Tea-Bag

Tea-Bag

Member
Joined 2006
Paid Member
dwjames said:
Kits received thank you :)

please could you explain with the 2SK117GR, you have included 2 pcs and one has been measured and marked. Is this measured one intended for J1 or J2 on the reflektor-d mini?

edit---- I guess it's the IDSS so it's for J1 to help determine the value of RR right?

thanks,
James
Click to expand...

Yes, The unmeasured is for use potentially as J2. In Reflektor-Mini, it is necessary.
Also, there are two diodes included 1N4148, and then a 1N5231B. They look almost identical.
If you use a diode tester, the 1N5231 will show more voltage across it. See the Reflektor-Mini build guide for further guidance to fine tune the output voltage. A little more work goes into implementation of the Reflektor-Mini.
The benefit is, besides footprint, is that with adequate heatsinking, you can really pump up the CCS and/or output current.
 
dwjames

dwjames

Member
Joined 2012
Tea-Bag said:
Yes, The unmeasured is for use potentially as J2. In Reflektor-Mini, it is necessary.
Also, there are two diodes included 1N4148, and then a 1N5231B. They look almost identical.
If you use a diode tester, the 1N5231 will show more voltage across it. See the Reflektor-Mini build guide for further guidance to fine tune the output voltage. A little more work goes into implementation of the Reflektor-Mini.
The benefit is, besides footprint, is that with adequate heatsinking, you can really pump up the CCS and/or output current.
Click to expand...
excellent, cheers. I have 1 working on the test bed now and all seems well.
Thanks again,
James
 
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