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What's your favorite calculator?
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rsjsouza:

--- Quote from: David Hess on October 23, 2022, 01:18:39 pm ---
--- Quote from: rsjsouza on October 23, 2022, 01:27:47 am ---This is plain evil... I put this as evil as the negative center tip on power barrel jacks of japanese musical instruments.
--- End quote ---

There is actually a good justification for center tip negative.  It allows the built in switch to disconnect positive in a negative ground system, so ground remains connected and ground is connected first.

--- End quote ---
IME 100% of such adapters I saw were fully isolated (linear power supplies), therefore disconnecting ground or positive makes zero difference in the greater scheme of things. Also, the disconnect can vary with the quality of modern variants of barrel plugs - I got various models that vary their disconnect pattern - sure, the vast majority of them connect the center first, but I have seen some that don't. To me it makes zero difference, only an annoyance that is prone to bring yet another crap variable to the already confusing world of barrel jacks and plugs with various voltages but with the same dimensions.
David Hess:

--- Quote from: rsjsouza on October 23, 2022, 05:19:46 pm ---
--- Quote from: David Hess on October 23, 2022, 01:18:39 pm ---
--- Quote from: rsjsouza on October 23, 2022, 01:27:47 am ---This is plain evil... I put this as evil as the negative center tip on power barrel jacks of japanese musical instruments.
--- End quote ---

There is actually a good justification for center tip negative.  It allows the built in switch to disconnect positive in a negative ground system, so ground remains connected and ground is connected first.
--- End quote ---

IME 100% of such adapters I saw were fully isolated (linear power supplies), therefore disconnecting ground or positive makes zero difference in the greater scheme of things. Also, the disconnect can vary with the quality of modern variants of barrel plugs - I got various models that vary their disconnect pattern - sure, the vast majority of them connect the center first, but I have seen some that don't. To me it makes zero difference, only an annoyance that is prone to bring yet another crap variable to the already confusing world of barrel jacks and plugs with various voltages but with the same dimensions.
--- End quote ---

But it gives the option, or at least makes it easier, to power something from a non-isolated DC source.
onsenwombat:
TI-85 any day, every day.
Picuino:
With the Zilog Z80 at its heart.
What a great microprocessor!

DiTBho:
Casio fx7500G  ;D
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