Little problem with a simple schematic
I was trying the new Multisim 11 and so I decided to reproduce the schematic below, which I took from a book. It should be led flashing at intervals, but I can't get it to work. Can someone kindly tell me why it isn't working(flashing)?
Message Edited by poldoj on 01-14-2010 06:59 PM
Solved!
Go to Solution.
Attachments:
Design1.zip 51 KB
Hello Poldoj and Andrew. I agree with Andrew. It didn't work with 470 kOhm (the time is long, but nothing at all happens - even if you wait a long time). It seems that the simulation never reaches the flash-point. I lowered 470 kOhm to 220 kOhm and then it works. In the simulation, the LED will flash (briefly), but it will not discharge the 2.2 uF entirely. I added a 100 Ohm resistor in across the LED to discharge the capacitor more. It is easier to see what happens in the graph then, but is probably not needed in the real circuit. See the two graphs with and without the 100 Ohm.
W.kr.
Attachments:
Design1_b.ms10 61 KB
Graph.jpg 162 KB
Graph_wo_100.jpg 156 KB
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