My dad has a nicer power supply that does have current limiting. I can test on that tomorrow. What is the maximum amperage I should allow?
I think I could replace the diode but if I can't my dad definitely can. He was trying to help me but he just doesn't understand the circuit that much.
It is a bit hard to test a zener, especially a low-voltage one in circuit.
I just measured mine with the diode test function of my multimeter, and it measures 0.31V in one direction, and 0.44 volts in the other.
I don't know what that really means, but if yours is broken, you will likely see something different.
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The way I have normally tested D109 is to remove it, then power on and see if the rig wakes up normally.? If it does, I know that D109 was bad and replace it.? I do NOT recommend you do this, because you have no current limit on your supply, and D109 will not be there to protect your processor and other 3.3V devices if there is still a problem.? Instead, I would replace it before trying to power on again.? Then if there is still a problem, D109 will conduct the over-voltage to ground and not harm your other ICs.
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D109? is very small and nestled between two other devices, so be sure you have the practical skill (practice helps a lot) to replace it before trying; otherwise send it to someone else to fix.? I can look, I may have an extra one I can send you if you don't have one but do have the skill to replace it.
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Stan KC7XE
