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Noon question

Don Gamble
 

Hello all,

I am finally putting together my uBITX and want to make sure I connect the diode in the correct places.  I have attached pics.  If I connect the black wire on the left, brown and red together on bottom and leave the top open will I have it set for a normal power supply?  Forgive my lack of proper terminology, I am the opposite of an engineer.  

Thanks and 73 De Don KG5CMS.


Evan Hand
 

The polarity will be correct, but where are you switching the power?  Do you plan to use the switch on the volume control supplied with the v4 and v5 kits?  Also, are you planning to do the reverse voltage protection diode?  Fuse?

From what I can see of the board, it looks like a v4.

73
Evan
AC9TU

Don Gamble
 

Thank you for your reply.  BTW, the subject line should have read noob instead of noon, autocorrect has become my worst enema.

I am okay not using the volume for power.  From what I understand I will connect the silver side of the diode with the red and brown wire on the + and black side of the diode with the black wire on the -.  I dont have a fuse in my kit, should I have?  

Thanks for the help.

73 de Don KG5CMS.

On Fri, Apr 10, 2020, 4:23 PM Evan Hand <elhandjr@...> wrote:
The polarity will be correct, but where are you switching the power?  Do you plan to use the switch on the volume control supplied with the v4 and v5 kits?  Also, are you planning to do the reverse voltage protection diode?  Fuse?

From what I can see of the board, it looks like a v4.

73
Evan
AC9TU

Evan Hand
 

Different Hams have different views.  One of the RF Engineers on this board does not use fuses for anything other than keeping a fire from happening.  

I would recommend a fuse more than 3 amps and less than the wire size can carry that you are using to power the rig. I use 3 amps, and it has saved me a couple of times that my fat fingers sauced a short that could have taken out some other components.  You diffidently want a fuse IF you are putting in the reverse voltage protection diode across the supply lines as the HF Signals assembly instructions suggest. 

73
Evan
AC9TU