SSLV1.1 builds & fairy tales

[merlin el mago]

Thanks Salas I will try as is & let you know.

 

[Salas]

0.1A spare more in one reg maybe not something you will get to sound, iheaters is not exact and direct to signal work, for sure a thing to feel is one reg going to be few C hotter than the other to the touch.

 

[merlin el mago]

No problem I will use the 0.1A more reg in the rail where is the red LED front panel indicator as power on.

 

[merlin el mago]

Salas what's the best way to connect the reg to the the Valve Itch heaters: 2 wires or 4 wires Kelvin?

 

[Salas]

2 wires

 

[merlin el mago]

 

[merlin el mago]

The first reg works ok but the 2nd reg with less CCS doesn't works ok, Vref LEDs D306 only lits depending the trimmer R305 position & LED D305 don't lit never.

 

[merlin el mago]

I'll go to change the two Vref LEDs.

 

[merlin el mago]

Vout min. 8.85V all LEDs lit.

 

[merlin el mago]

Replace with the lower VGS unit you will find. The difference to lower VGS is going to add on your now 0.824V.

Do you refer to Q101-301 right?

 

[merlin el mago]

The Q101 measured VGS 3.307V, the lower VGS that I find 3.293V, will be enough?

 

[Salas]

Do you refer to Q101-301 right?

Yes

 

[Salas]

The Q101 measured VGS 3.307V, the lower VGS that I find 3.293V, will be enough?

Worth a try. Depends on how much it will differ when in high current.

 

[merlin el mago]

Ok I will try, thanks.

 

[merlin el mago]

With the new mosfet Q101 3.293V CCS lowered to 0.815V across 0.68R resulting the two red LEDs voltage ref don't lit & can't adjust to a fixed Vout.

 

[Salas]

Unexpected goal failure. It probably reacts differently for VGS at high CCS than the trend indicated by low mA DCA test.

 

[merlin el mago]

I used this test: right side pic with 2k2 resistor for R1

 

[merlin el mago]

What can I do?

 

[Salas]

Use the one Mosfet you used before

 

[merlin el mago]

OK

To fix Vout can decrease R101-301 resistor to have more CCS?