Hello fellow EEVs!
I'm new to this forum, so please be patient if I'm not doing things right :p
I'm working on a simple 2 buttons soft power latch circuit, and got inspiration from circuits by Dave (www . youtube . com/watch?v=Foc9R0dC2iI) and Kedar (
http://www.instructables.com/id/Soft-Latching-Power-Switch-ON-OFF-Circuit). You'll find the schematic attached.
I simulated the circuit in LTSpice before breadboarding it, and I have an issue with the circuit: The "On" pushbutton works like a charm, but the "Off" pushbutton seems to short the circuit when depressed! It does work though, the circuit is turned off once released. But you better not keep your finger on the button too long! In LTSpice I can indeed see a big 12A current spike when I simulate the switching off, and on the breadboard, well... Let's just say I'm happy my lab power supply is short-protected :p
Has anyone an idea on how to avoid this shorting while keeping the circuit working?
Oh, and just by curiosity, does someone knows why when I simulate the circuit in LTSpice, the circuit starts in the "On" mode, while in the real breadboard world, it starts in the "Off" mode?
In advance, thanks for your help!