Salas SSLV1.3 UltraBiB shunt regulator

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joshua43214

Member
Joined 2011
Selection is limited for R1.
I ordered an assortment that will get me 222mA, 250mA, 272mA, and 300mA.
The Katana opamp should draw no more than 167mA at +-15V, and probably much closer to 133mA according to the spec sheet.

Once it is all put together, I will swap in the correct resistor that gives me as close to 100mA headroom as is reasonable. I will also PM the other Katana guy and let him know what the correct value it should be since he is running way to hot by my reading of things.
 
Salas

Salas

diyAudio Chief Moderator
Joined 2002
Paid Member
Sinking on the chassis floor with some forced air aid should suffice at 5V. If the chassis floor is substantial or by using an aluminum bar interface you may escape forced air need even. In general don't allow more than 65C when measuring on the MOSFET plastic bodies and they will be long term reliable.
 
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D

delfimmarues

Member
Joined 2015
Salas said:
Try post a bigger image? If its only about the supply and the load, the Leds can go off when the CC limit is not set at high mA enough. Or when there's an output short. If its something's wrong with grounding its about analyzing the application.
Click to expand...

Salas,
I believe it is not about the supply because the same system was working ...
What happens and when I turn on Dam1021 the power goes off even ... goes to 0v.
 
J

joshua43214

Member
Joined 2011
delfimmarues said:
Salas,
I believe it is not about the supply because the same system was working ...
What happens and when I turn on Dam1021 the power goes off even ... goes to 0v.
Click to expand...

If the PS shuts off when you turn on the load, that implies the load has a dead short.
Try removing the Dam1021 from the stand offs, and set it on some cardboard.

s-l1600.jpg


http://www.soekris.dk/download/dam1021/dam1021 user manual 20151005.pdf
I looked really closely at your images, it looks like it is hooked up properly, maybe double check that +15V is really going to pin 1, and not pin 4. Maybe the board won't be happy unless pins 2 and 3 are jumpered at the connector. I assume they are bridged beneath the connector.
I can't see an insulating washer on the left mosfet, but it get pretty grainy blown up big enough to see what looks like a washer on the right side.

Another thought is that maybe the 3rd power supply is hitting one of the mosfets.
 
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delfimmarues

Member
Joined 2015
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