johnny_cash
- Aug 13, 2013
- 39
- Joined
- Aug 13, 2013
- Messages
- 39
I'll order, mockup and test all, in fact. The way you pointed me the problems is really exciting
- could discharge through the Vbb circuit once the relay is powered off (because, for now, i have not schottky) ?
Is the charging time instantaneous (or nearly) in regard of mecanical bounces on the SPDT ?
Another important thing: when Vee is connected, the MCU is powering a LED (permanently) and disable it when Vbb is connected.
I think when i'm switching back to Vbb, the LED is still powered, and will be unpowered on my next cycle - i have100ms cycle... - so the time the led is powered it creates a significant current sink. This is a really decent reason !
The time for the capa energie is t=RC right so a 20k load should last around 100ms, right ? Or t = RC would only be for capacitor charging through a resistor and not when the load is parallel to the capacitor ? Is there any better formulae ? I don't understand everything on wikipedia related to this.
Warming my oscilloscope, thank you !
The relay is a no-go. Even with a 1000uF, i have a brown out reset.
Without the diode it will continue to do that with any value of capacitance.
I'll answer the other questions later.
Yeah, it looks like I drew the mosfet backwards. Source and drain are reversed.
As I have tried to tell you before. Without diode D1, the capacitor is being used to hold the relay in after you disconnect the external power source.
The diode prevents this from happening, powering *only* the load.