Re: Question about voltage regulator
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Hi!
Based on assumptions on how many uBitX rigs that have been reprogrammed and how many of these that had their radiunos powered solely by USB 5v at the time, I'd say that as long as you don't try to transmit in this scenario You're fine. If this were to kill the 7805 we would surely heard about it by now.
If we could find a nice quiet DC/DC switching module, that would of course be a better option in terms of heat and current use. Maybe this could be used:?
Too bad it only comes in this package though... Den fre 14 maj 2021 kl 06:48 skrev Mark - N7EKU < n7eku@...>:
Hi,
If you read the datasheet for the regulator it's warned about there:
8.1.2 Raising the Output Voltage Above the Input Voltage? Because the output of the device does not sink current, forcing the output high can cause damage to internal low current paths... this diode, low current metal, and the regulator are destroyed.
I don't know how much current it can take, or how much current the rig would draw while connected, but a diode might not be a bad idea.? Just to be on the safe side.
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