Giant capacitor

191

03:14:24

Made with an NPN Transistor of 100 Beta ...
When you hit the swich the lamp will turn on ever by letting the swich go for  secondes "Reatime simulation"
This actually happens because the capacitor is decharging on the base-collector which will saturate the transistor and let a currenter flow in the emmitor-collector...
The transistor can be saturated for 1 fA and the capator will actually take a lot of time before it decharges less than 1 fA
The more the resistance in the base the more time you get out of it and less current for the lamp

published 11 years ago

afelicetti

11 years ago

Intestring usage!

Sine_eyed

11 years ago

It's a common, but effective delay-off configuration. I've built real ones for lamps and fans, but with a reduced RC value- I'm curious what you would want to use such a long delay for..

Siegrain

11 years ago

LED effect and filters is guess, but i not very useful

faceblast

11 years ago

switch debounce

Sine_eyed

11 years ago

I hadn't considered that faceblast- but yeah I can see it being useful in some comparator situation, or something like that.. <=^o

cjdelphi

11 years ago

Not worth the cost of the capacitor might as well use 2 transistors and a smaller cap..

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.