Hi Peter,
Sorry, what I meant was to use only one Grove MOSFET board, to supply 12V to the QDX when it's on.
When that one MOSFET board is off, the QDX is powered by the string of diodes.
Put them in parallel, so the minimum voltage is "diode string" and the maximum voltage is "MOSFET Board On".
Does that make more sense?
73, Willie N1JBJ
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On Aug 13, 2022, at 11:43 AM, G3SPL <
leepd60@...> wrote:
On Sat, Aug 13, 2022 at 10:53 AM, William Smith wrote:
Peter,
?
Could you leave the diode string in-line at all times and short it out with the Grove MOSFET swich, or do you need to be able to turn all the power off at times?
?
73, Willie N1JBJ
Willie.? Yes, you can absolutely operate the switches in series, with the second switch just short circuiting the diode droppers. In that case, you would need to short circuit D3 in both of the Grove MOSFET boards as this Schottky diode drops about 0.3 to 0.4 volts otherwise. Doing it my way saved me about 10mm of wire for the short circuit!? Oh, and of course the series arrangement has another MOSFET "on" resistance added which drops a few more millivolts.? Either way is fine.
Peter Lee
G3SPL
