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On the left is the load. On the right is the latch. In the middle is the power off pulse controlled by the mcu.
The push button on the right powers on the system, and the logic source in the middle powers off the system on release.
Can someone review/provide some feedback on this circuit? I'm very new to electronics, and I'm trying to build a soft latching power switch, that can be turned off by e.g. an arduino.
I haven't really done any maths on this, resistor values are mainly chosen by trial'n'error.
The reason for the middle circuit is an attempt to make the power off function more resilient, for example to ensure that tha latch is turned off before the mcu looses power.
I've chosen a low side switch, because I have n-channel mosfets lying around. The particular mosfets I have are fqp30n06l. I'm not sure how to configure the everycircuit mosfet to those specifications though, perhaps someone can help?
For bjt's, I'm thinking of using 2n3904's and 2n3906's, because I have them in stock.
For diodes, I'm thinking 1n4001's for the same reason as above.
EDIT: I’ve noticed, that if you slow down the simulation to fix 1ms/s or less, then a large power draw spike occurs when powering on. Anyone has any idea what’s causing this? It’s more obvious if you disconnect the motor.
Thanks!
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