Posted: 07:49am 16 Jun 2025 Copy link to clipboard
Grogster Admin Group
This is my prototype PCB layout:
Still playing with the idea, but.... Very small PCB - 43mm x 40mm. Will easily fit inside the projector.
Posted: 08:15am 16 Jun 2025 Copy link to clipboard
Mixtel90 Guru
It's a bit posh! I'd have dug a scrap of veroboard out. lol Your mosfet should fully saturate with that low a load. RDS(on) will be 0R1 or less so power dissipation will be about 13 milliwatts!
Posted: 08:48am 16 Jun 2025 Copy link to clipboard
Grogster Admin Group
OK, so then perhaps I don't need the copper-heatsink on the drain then!
I was just thinking that I normally run the projector for many hours before I shut it off, so more copper-pour as a heatsink was better then none.
Posted: 09:19am 16 Jun 2025 Copy link to clipboard
Mixtel90 Guru
It's fine - it won't do any harm to have something to hold the tab down. You almost certainly won't need a lot though.
Posted: 08:41am 18 Jun 2025 Copy link to clipboard
Grogster Admin Group
New projector has arrived.
I will just check it powers up and down fine, then I will add the mod.
