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Old 20th October 2009, 12:42 PM   #31
Default really need help guys!

I am so sorry, I didn't conversate much more English, I'm a Filipino. Can anyone please configure my circuit coz I had already subitted my paper work in that project and I do really have not enough time to do another. Please help dudes..

Last edited by melvinspeed21; 20th October 2009 at 12:46 PM.
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Old 20th October 2009, 03:24 PM   #32
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You're fine melvinspeed. Some members have control issues. Do you know how your project is supposed to work? Can you name your circuit? Can you basically describe it's operation? I can offer some suggestions to make it work, but if you dont have any idea how it's supposed to work, you won't understand my suggestions. And I've tried to simulate these circuits, but LTSpice seems to have trouble for some reason.
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Old 20th October 2009, 03:27 PM   #33
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Quote:
Originally Posted by BrownOut View Post
You're fine melvinspeed. Some members have control issues. Do you know how your project is supposed to work? Can you name your circuit? Can you basically describe it's operation? I can offer some suggestions to make it work, but if you dont have any idea how it's supposed to work, you won't understand my suggestions. And I've tried to simulate these circuits, but LTSpice seems to have trouble for some reason.
hi,
Post your LTS asc files, I like a challenge.
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Old 20th October 2009, 03:33 PM   #34
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HI Eric. The first asc file simulates fine, but seems to take a long time for such a simple circuit. In the 2nd one, I've attempted to add output buffers, but the simulation just seems to hang up.
Attached Files
File Type: asc astableMulti.asc (2.1 KB, 3 views)
File Type: asc badInvertro.asc (2.6 KB, 4 views)
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Old 20th October 2009, 03:35 PM   #35
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BTW, I think the OP needs to drive his globes from added buffers to get his project to work. I think connecting them in place of the Collector resistors is a bad idea.
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Old 20th October 2009, 03:43 PM   #36
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Quote:
Originally Posted by BrownOut View Post
BTW, I think the OP needs to drive his globes from added buffers to get his project to work. I think connecting them in place of the Collector resistors is a bad idea.
hi,
Try these.
Attached Files
File Type: asc astableMulti.asc (2.2 KB, 5 views)
File Type: asc badInvertro.asc (2.6 KB, 2 views)
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Old 20th October 2009, 03:47 PM   #37
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That was fast. What is the difference?
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Old 20th October 2009, 03:55 PM   #38
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Originally Posted by BrownOut View Post
That was fast. What is the difference?
hi,
I have changed the Pulsed 12V to a fixed 12Vdc and set it to skip initial start up, also delayed the 'saving data' time.
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Old 20th October 2009, 04:07 PM   #39
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Thanks Dude Pulsing the 12V was my attempt to give the circuit a starting transient.

melvinspeed, here is one idea that might get you going. Q3 and Q4 were added to drive your globes, which are modeled by R12 and R9. This circuit is provided as an illustrative example of how to drive using a multivibrator. It may not be the final circuit that works in your final configuration. It's up to you to understand the principles involved and get it to work.
Attached Thumbnails
need a little help here!-globeinvertor.jpg  
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Old 20th October 2009, 07:31 PM   #40
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I don't think the diodes should short the bases of the transistors and ruin the negative swing of the capacitors.
Instead I think the diodes should be in series with the bases.
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need a little help here!-beacon-circuit.png  
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Old 20th October 2009, 07:32 PM   #41
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It's unconventional. But it works.
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Old 26th October 2009, 10:18 AM   #42
Default waaaaa.....

Wew! I'm sick and tired of it (my old alternating flasher light).. I think this 1 (image below) will now work. I am having again your opinion guys! Thanks to those who helped me before. Thanks so much!
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