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Sbitx V4.2 Low Voltage warning

 

Hi to the group, I finally got my Sbitx DE up to 4.2 and it works fine but I have two issue
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1). Low Voltage power warning when the PS is 14.1 Vdc
2). The display is about 1/2 the brightness it was on the factory software and the brightness control is set at max (31)
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Need input -- please
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Rick W7RNB
 

Rick,
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Did you add a different 5V regulator like a Drok or similar? If so, you can fix the low voltage problem with a old micro USB cable. Let me know and I'll explain how to to do it.
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Joel
N6ALT
 

Hi Joel -- it has the upgraded regulator installed, the replaces the LM338

R

On Tue, May 6, 2025 at 1:54?PM Joel Caulkins/N6ALT via <caulktel=[email protected]> wrote:
Rick,
?
Did you add a different 5V regulator like a Drok or similar? If so, you can fix the low voltage problem with a old micro USB cable. Let me know and I'll explain how to to do it.
?
Joel
N6ALT
 

Rick,
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I took a old USB cable and chopped off the end that would plug into the computer, I then wired the 5V pair out of the cable directly to my 5V source, then plug the other end into the Raspberry Pi¡¯s power USB connector. Leave all other connections in place. That stopped the low voltage alarm.
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joel
N6ALT
 

Thanks Joel --


On Tue, May 6, 2025 at 6:49?PM Joel Caulkins/N6ALT via <caulktel=[email protected]> wrote:
Rick,
?
I took a old USB cable and chopped off the end that would plug into the computer, I then wired the 5V pair out of the cable directly to my 5V source, then plug the other end into the Raspberry Pi¡¯s power USB connector. Leave all other connections in place. That stopped the low voltage alarm.
?
joel
N6ALT

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