Re: QMX - smoke - another C107/Q108 failure
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Hi Jonathan, Kees
These plots supplied by Jonathan look completely normal to me.?
The 3.3V rail experiences some disturbances during the boot-up process and this is completely normal; it is powered by the 78M33 linear regulator during that time via a 1N4148 diode. The diode voltage drop will naturally?show some variation depending on current draw, and current draw will be variable as the unit boots up various things.?
On Mon, Aug 28, 2023 at 6:27?PM Jonathan Burchmore < burch@...> wrote: Kees,
Here you go.? Measured on my working 9v QMX.
On:
Turn off with encoder press:
Hard turn off (in this case turning off the bench power supply, not actually pulling the plug):
Hope this helps,
Jonathan KN6LFB
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