Salas SSLV1.3 UltraBiB shunt regulator

[merlin el mago]

I'm sorry can't fix the issue Mark.
Felipe

 

[asphalt]

Thank you for all your efforts
Mark

 

[merlin el mago]

Look how I soldered J1. Center leg it's on the left side and the left leg is soldered on the center

 

[merlin el mago]

Was powering a 5V Cronus re-clocker of Twisted Pear

 

[asphalt]

How did you figure out why to do this?
The transistor is opposite the silkscreen as well?

 

[merlin el mago]

It’s a mod suggested by Salas.

 

[asphalt]

I can try this
I want to wait till Salas responds though
I hope it works!
Mark

 

[Salas]

There's no voltage drop between the input and output section. Thus no current across R1 either.
First wind the output voltage adjust trimmer all the way down.
Then measure if Q2 shows about 0.6V Vbe (DC between base & emitter).

 

[merlin el mago]

I can try this
I want to wait till Salas responds though
I hope it works!
Mark

Not use it, follow Salas advice.

 

[Salas]

It’s a mod suggested by Salas.

Remind me what was the situation?

 

[asphalt]

Yes there’s about .64V between base to emitter on Q2

 

[merlin el mago]

Remind me what was the situation?

Not enough mA of Idss at J1 and used other component with other pinout

 

[Salas]

@asphalt
How much voltage across R6?

 

[Salas]

Not enough mA of Idss at J1

So we made some some special direct connection skipping its source resistor?

 

[asphalt]

I have some improvements even with the pot turned all the way down V is 5.2V
Rf is cooking and smelling
D1-4 are hot
Is this a stable situation?
I can heatsink the diodes
Up the wattage for Rf
But V needs to be 5V

 

[merlin el mago]

So we made some some special direct connection skipping its source resistor?

Surely

 

[Salas]

From voltage drop across Rf divided by its value we will derive current. How much is indicated?

 

[Salas]

I have some improvements even with the pot turned all the way down V is 5.2V

At least your target vout has now been nearly achieved.

 

[Salas]

Rf is cooking and smelling

What is Rf's Ohmic value and Wattage? Did you use more than 0.33Ω?

 

[merlin el mago]

2A is a lot of current.