SSLV1.1 builds & fairy tales

[king4joy]

Salas,

Can the 2SK880GR you mentioned in the SSHV, be used here as well when needed ??

Cheers,

King

 

[Salas]

Yes when used with a SOT23 to DIP3 mini converter board (very cheap on ebay). But remember its a 100mW device so don't forget to check its temperature is not alarming in all its various circuit positions when setting your own SSLV1.1 application, especially if its a high voltage output set.

 

[merlin el mago]

Salas attached pic of scope shot 20us 5mV/cm BiB reg.

 

[Salas]

Too much cloud for Bib. See about better wiring.

 

[merlin el mago]

BiB is powering Amanero & one side of I2S isolator with small wire Kelvin 4 wire connection set to 1.048A but the Vout is jumping between 1.7-1.9V

 

[Salas]

In that occasion it can be hash from digital emissions on the rail. Try shielded coax sense no matter if short or two wire mode twisted. Keep whatever shows less hash on the scope (green fog)

 

[merlin el mago]

I have same problem with Reflektor powering the clean side of the I2S isolator.

 

[merlin el mago]

Two coaxial using the shield as sense?

 

[Salas]

One simple wires twisted force pair (not too thin) one shielded coax cable as sense pair. Inside conductor as sense +. Shield to sense zero.

 

[merlin el mago]

Now Vout is jumping 3.308-3.310V

 

[Salas]

But the fog has also thinned so I guess go two wire thick enough twisted pair mode. It does not look like the sense nodes are well representative the way those boards are.

 

[merlin el mago]

Is enough 24AWG for force?

 

[Salas]

How long run you need and how much current the board sucks in?

 

[merlin el mago]

Amanero sucks 130mA, I2S isolator I don't know link:

Free Amanero Isolator bare PCB Twin pack - DIYINHK

 

[merlin el mago]

Texas Instruments ISO7640FM 2mA 3.3VDC

ISO7640FM 6kVpk Low Power Quad Channels, 150Mbps Digital Isolators | TI.com

 

[merlin el mago]

Max 10cm

 

[Salas]

About 18AWG for two wire mode (as twisted pair) is better I would say. If for Kelvin, 24AWG force twisted and a thin coax cable for sense (like cable for SE signal inside a phono etc.)

 

[merlin el mago]

Attached pics.

 

[merlin el mago]

BiB is powering Amanero & one side of I2S isolator with small wire Kelvin 4 wire connection set to 1.048A but the Vout is jumping between 1.7-1.9V

Salas if I reduce the current can reduce the ripple?

 

[Salas]

Attached pics.

What we see here? Two wire mode or Kelvin ending in two different connectors?