LED Capacitor Timer

138

03:39:11

Tried to control the time the led is lit after the switch is thrown to "off" with a capacitor. Can anyone tell me why the output from the cap is so irratic? appreciate it.

published 8 years ago

Tedski

8 years ago

Touch cap to highlight it, then press eye icon to see scope..!!

emanjackson

8 years ago

Im not talkingabout waveform. im talking about the current flow same as it does with the led switched on. "20mA" for example

BillyT

8 years ago

It shows on my phone, must be your device.

sugarpasa

8 years ago

Yeah something is definetely wrong the way you put it out

hurz

8 years ago

What else are you missing? I just changed the simulation speed from 1millisecond/second to 1s/s http://everycircuit.com/circuit/6249344312541184

Anemo

8 years ago

Practically the led liting time is very small ....this circuit is useful to check a blown fuse ....am i right....great work ....

forthekek

8 years ago

emanjackson

8 years ago

Its not important that I see the current flow from the cap. but i wanted to use it as a means of gauging how long the led will stay lit depending on the capacitor size.

emanjackson

8 years ago

Can anyone tell me how I can calculate the length of time the led's will stay lit? I need to work out what cap to use to keep the led's lit for 5-10 mins after switch is thrown to "off". Thanks.

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