Power supply testing


I ve just assembled shruthi and I checked the voltages
I have 0V all the red et green points
What’s wrong

What’s your power supply? Maybe it has the wrong polarity.

it’s a power supply for guitar effect, 9 V 200 mA

200 mA is a bit flat-chested and most guitar effects i know (and own) are center negative, but you need it center positive…
Any chance to try a different one ?

ok! how many mA for shruthi?

From the specifications page:
“power: 2.1mm connector, requires 7.5V-9V 300mA supply (can be unregulated). Center pin positive (+), outer collar negative (-)”


Ok, i bought another one power supply with center pin positive (+), 300mA and I have 5V
Thanks everyone