SSLV1.1 builds & fairy tales

[Salas]

Then check MOSFETS Vgs (pins 1,3 at 3-4V normal).

 

[merlin el mago]

Ok thks

 

[merlin el mago]

Hmm... Check the BC transistors Vbe first. If any abnormal like much different than 0.5V-0.7V should be dead.

BC550C Vbe 0,24V

 

[Salas]

Replace for sure

 

[merlin el mago]

Then check MOSFETS Vgs (pins 1,3 at 3-4V normal).

Q301 7,03V & Q306 0,8V

 

[merlin el mago]

Replace for sure

Ok

 

[Salas]

Q301 7,03V & Q306 0,8V

Q301 weird. Replace first of all. Because its located before them in circuit. Maybe its the one starving them.

 

[merlin el mago]

Ok I will Replace Q1 & measure again the BC550C

 

[Salas]

Yes. There are chances for one or the other. But this is the better order.

 

[samoloko]

Salas,

Is there a way a BiB pcb to be modified to Ultra BIB

 

[Salas]

Salas,

Is there a way a BiB pcb to be modified to Ultra BIB

No way, they differ a lot.

 

[merlin el mago]

BC550C Vbe still 0,24V, time to change for a new one.

 

[merlin el mago]

With the new mosfet & BC still Vout fixed to 7.2V, I will measure again the new mosfet & the new BC.

 

[merlin el mago]

Hmm... Check the BC transistors Vbe first. If any abnormal like much different than 0.5V-0.7V should be dead.

0.4V

Then check MOSFETS Vgs (pins 1,3 at 3-4V normal).

7V

 

[Salas]

How much voltage across R301 leg to leg?

 

[merlin el mago]

Wait a moment.

 

[Salas]

And how much Vgs on Q306 again

 

[merlin el mago]

0.465V across 0.47R = 0.989A

 

[merlin el mago]

And how much Vgs on Q306 again

It's jumping between 0.7-0.8V

 

[Salas]

0.465V across 0.47R = 0.989A

Is that enough for the application?