modified 6 years ago

Power Blinker II

00:51:14

Hey @Sine, instead of darlingtons, try using IRFP250 power mosfets.  Little bit fiddly to set up, but much more power

published 11 years ago

Sine_eyed

11 years ago

BAM! Flip that switch and get the crap slapped out your face- lol! Now This, is a power blinkie! Nice circuit man- I see you put into action what @rk was talking about, with the small caps/big rstrz. That's workin mighty fine. Yeah I have another one on deck but I'm not pulling the power out of it that it wants to. It calls for power transistors but I dunno how, or if we can even emulate them here <=^/ I've got real ones complete with specs but that doesn't do much good- hfe here doesn't go below 100. You guys know a way around that?..

faceblast

11 years ago

Yeah you can set HFE below 100 in EC, use the fine adjust buttons on the forward beta. But check your datasheet, eg MJL3281 has a HFE of 175 and can sink 15A; and the base can sink 1A. So at full tilt, the HFE is really only 15. Best way I've found is to build a real circuit, bias the transistors off and on and measure the Vce to work out the on resistance.

faceblast

11 years ago

what transistors do you have

Sine_eyed

11 years ago

Hmm, lemme see... I got some BD139/140, TIP31/42/120, I know there's a couple 3055's around here somewhere. A bunch of randoms that I've yanked outta scrap- been meaning to go thru those and find out what I got..

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.