I made a few simple halloween decorations with some 555-timers and LEDs that run off a 9v battery. For now I've just be disconnecting the battery to turn them off but after seeing Dave's World's Simplest Soft Latching Power Switch Circuit I got curious about the idea of trying to implement a power switch following that design.
The only issue i have I think is that I do not currently have any high-power mosfet to use like he did in the circuit. All I have available is a bunch of 2N3904 transistors. Most of the decorations are well below the 200mA rating for these so I am assuming I can just swap out the mosfet for a single transistor and it would work. One however has many LEDs and draw around 550mA peak which exceeds the ratings. For this decoration, would it be possible to split the current across 3 separate transistors so each one would draw about 183mA peak?
I attempted to adapt the schematic from the video and this is what I came up with.
I've not yet tried this out on a breadboard, so I'm not sure if it works at all yet. I'm just wondering right now whether this idea of current splitting would actually work? If it would, did I correctly adapt the circuit or did I goof it up somewhere?