voltage problems midibox 64

[matcom3]

hi

 

I´m having problems with the voltage of my midibox 64, at the output of the 7805 i have 5 volts perfect, but when i test the pots i have 4.8,the problem is at the maximum of the pot the box never send "127" the maximum is "126" its a problem for me because some of the controls need 127 value, how can i sove this?, im using a wall adapter of 9 volts 1200 miliamps, can solve the problem a higher voltave adapter?, i am using 58 pots on the box, maybe is the problem.....

 

thanks

[TK.]

Hi,

 

are you using 10k or 1k pots?

 

In any case, it could work better if you connect the Ground/5V lines of the pots to J2 of the core module.

 

Best Regards, Thorsten.

[matcom3]

im using 10k pots, its better to use 1k pots?

Edited November 30, 2014 by matcom3

[TK.]

10k pots are fine, 1k pots would consume a bit more power which could explain the voltage drop of 0.2V

 

So, I recommend to test the direct J2 connection.

 

Best Regards, Thorsten.

[matcom3]

Hi again and thank you for the awnser

 

j2 its perfect 5 volts, the problem is the pot, 4.85 volts, how can i give more power to the output of the 7805?

 

thank you

[TK.]

My proposal was to connect the ground/5V cables of the pots to J2

 

Best Regards, Thorsten.

[matcom3]

hi again

 

the pots are conected direct to j2 now and no diference.... any help?

[TK.]

Could you please post a photo of your hardware (especially pot connections)?

This could help to analyse the issue further.

 

Best Regards, Thorsten.