SSLV1.1 builds & fairy tales

[stajo]

Seems like those that I also have in a box

 

[stajo]

The 5R6 as well as the lytic zobel seems to have snuck in there as well. Prolly soldered them all same time. Bit optimistic with those sinks but they were supposed to bolt into an alu case.

 

[stajo]

Uncle Der EE says 166 milliohms

 

[stajo]

The mad professor

 

[Salas]

 

[Salas]

Uncle Der EE says 166 milliohms

Run 100kHz test also where low impedance caps are characterized

 

[stajo]

Burning them now. Bit iffy results. The fixed VR is 3k6 and trim is 1k. They seem to have been built for +/- 18. Trim @ 0 gives 16,5 v. Its the same 5R6 as current limiter, but only 3 greens. And they take way different current.

 

[Salas]

Because three greens give lower total Vf roof i.e. less CCS with same Rset. But you can also pull the skipping jumper and populate the extra green.

 

[stajo]

Will try to measure some Vdrops but the darn things are boxed in effectively

Nothing heats up very much though.

 

[stajo]

Huh, 12,22 volts over R103/203?

 

[Salas]

Good temps are nice. Don't push the CCS much over where your specific app needs it.

 

[stajo]

0,95 over neg Rset, 1,1 over positive

 

[Salas]

Huh, 12,22 volts over R103/203?

 

[Salas]

0,95 over neg Rset, 1,1 over positive

Sounds more like it. Befits what the bench psus display.

 

[stajo]

The CSS probably works, and I can adjust the Vouts. 12.2 volts over R103/203 3K6 gives 3,39 mA and is probably legit. I tried to measure Vdrop over the 3 greens but got no readings. Maybe I can do it when not running. It must be very badly matched, although that doesnt sound like me

 

[stajo]

And it was thought for one of those https://www.nisshinbo-microdevices.co.jp/en/MUSES/series/MUSES72320.html so voltage config makes sense

 

[stajo]

I find it unlikely that the mismatch of green leds are responsible for the difference in current. With BM829:

Maybe Ill wet up the joints here and there

 

[Salas]

Vgs can be different in the associated MOSFETs though. Measurable between pins 1-3 (G,S).

 

[Salas]

In any case compensate with a differentiated value current set resistor.

 

[stajo]

Thanks, Ill kick it up again after reassembly. I also re-established the masterclass in complicating things. I switched caps MKT/Lyts when I was over it. Now ofc I cant fit the *** allen screws

Wheres the *** Dremel…