Laser Burglar Alarm -- Need Help - Page 16 - Electronic Circuits Projects Diagrams Free

john1 · 7th May 2008, 06:24 AM

I'm off to bed now.
Best of luck to-morrow ( i think its to morrow)

Let us know how it goes.

Cheers, John

Anonymous321 · 7th May 2008, 06:30 AM

Ah. Thank you again John and Torben. What you have said makes sense. And thanks for the compliment, John. I must admit though that it's not easy for me either to understand. I really have to think about it. For now, I think that, just to prevent my head from exploding anytime soon, I'm going to go study some math. Then I'll go back to understanding this alarm and I should be able to get it all. When I do, I'll make a post explaining how each of the components work.

Well, there's only the photocell and how when electromagnetic radiation--laser light-- is applied to it, the electrons are liberated from the cell (the photoresistor lowers its resistance), thus showing the photoelectric effect.
Then the transistor, which acts like an amplifying switch (I hope I got this right). I'm going to read what you two wrote again after math studying.
Then the resistor, which controls the current.

Yeah, I know I should go to bed. But I have a math test to study for too. Also, I took a power nap (these are awesome!) after I came back from school so I'm not exactly too sleepy.

john1 · 7th May 2008, 06:33 AM

i am definitely going to bed now,
my cat has come back in, and she is shouting at me (in a cat voice)
i dunno why.
maybe cos i should be in bed

Goodnight see ya later, John

Torben · 7th May 2008, 06:33 AM

Sounds like you're getting it. I'll still be online for a while. If you have more questions tonight I'll do my best to help.

Torben

Anonymous321 · 7th May 2008, 06:36 AM

Alright, good night (morning?) John. Please apologize to your cat for me.

And, ok Torben, thanks.

Anonymous321 · 7th May 2008, 11:00 AM

Well I think I know it.

Torben · 8th May 2008, 10:28 PM

So? What happened? Teacher like it or roast ya?

Torben

john1 · 8th May 2008, 10:49 PM

Mmm ...

Maybe there was someone there with a Higg's Bosun in a sock,
maybe the laser slipped and caught the tutor in the eye ...

Anonymous321 · 9th May 2008, 03:06 AM

Well...let's just say that he did ask about the flow of current/electrons. Sniff.

Gotta go for now. Another math test tomorrow -_-;

Torben · 9th May 2008, 05:22 AM

Dang. Hope you remembered that electrons flow from negative to positive.

Anyway, I hope it went OK overall. Good luck with the math test.

Torben

deepak george · 9th May 2008, 07:36 AM

dudes.........cud anyone out there gimme some walkie talkie circuits

Torben · 9th May 2008, 07:48 AM

Quote:

Originally Posted by deepak george

dudes.........cud anyone out there gimme some walkie talkie circuits

Please don't hijack other people's threads; start your own.

I suggest googling "walkie talkie schematic".

Torben

john1 · 9th May 2008, 11:46 AM

Quote:

Hope you remembered that electrons flow from negative to positive.

Hi Torben,
Yes this came up earlier,

Quote:

I knew about that conventional current was from positive to negative and that electron flow was from
negative to positive. But beyond that, I did not know. I did not know it was an issue either.
I mean, they're two different things, right?

This was the comment from Anonymous, and she has quoted the direction correctly, i dont see that
this should invite any problems. There seems to be no doubt as to direction.

However,
it seems the tutor did ask about ... " " the flow of current/electrons " "
and this was followed by " Sniff " , and an unhappy face.

followed by ... Gotta go for now.

So, maybe that bit didn't go well.
But i hope the rest went alright.

I would be very interested to find what was asked about "current/electrons",
and of course what was given as an answer.

*******************

And i hope the Maths exam went well for you.

Cheers, John

Torben · 9th May 2008, 06:00 PM

Hi John,

I'm a little confused. Why did you copy out half of Anon's email for me? English is my first language; I had no trouble understanding it.

Torben

john1 · 9th May 2008, 10:54 PM

Hi Torben,

I was agreeing with you.
And confirming that she mentioned it correctly before.

It wasn't just for you, i copied out a bit from before cos this thread has a lot of watchers,
and many of them may not look back to earlier posts.

I would still like to know what was asked about "current/electrons"
from the tone of Anonymous' post, that bit may not have gone well.

I think we both know that some people will bring up aspects of the well known "electric flow"
alternatives, sometimes just to generate "lively discussion".
Very often this can just confuse people.

John

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7th May 2008, 06:24 AM
john1 Experienced Member	I'm off to bed now. Best of luck to-morrow ( i think its to morrow) Let us know how it goes. Cheers, John __________________ ************************************************ ***************

7th May 2008, 06:30 AM
Anonymous321 Experienced Member	Ah. Thank you again John and Torben. What you have said makes sense. And thanks for the compliment, John. I must admit though that it's not easy for me either to understand. I really have to think about it. For now, I think that, just to prevent my head from exploding anytime soon, I'm going to go study some math. Then I'll go back to understanding this alarm and I should be able to get it all. When I do, I'll make a post explaining how each of the components work. Well, there's only the photocell and how when electromagnetic radiation--laser light-- is applied to it, the electrons are liberated from the cell (the photoresistor lowers its resistance), thus showing the photoelectric effect. Then the transistor, which acts like an amplifying switch (I hope I got this right). I'm going to read what you two wrote again after math studying. Then the resistor, which controls the current. Yeah, I know I should go to bed. But I have a math test to study for too. Also, I took a power nap (these are awesome!) after I came back from school so I'm not exactly too sleepy.

7th May 2008, 06:33 AM
john1 Experienced Member	i am definitely going to bed now, my cat has come back in, and she is shouting at me (in a cat voice) i dunno why. maybe cos i should be in bed Goodnight see ya later, John __________________ ************************************************ ***************

7th May 2008, 06:33 AM
Torben Experienced Member	Sounds like you're getting it. I'll still be online for a while. If you have more questions tonight I'll do my best to help. Torben

7th May 2008, 06:36 AM
Anonymous321 Experienced Member	Alright, good night (morning?) John. Please apologize to your cat for me. And, ok Torben, thanks.

7th May 2008, 11:00 AM
Anonymous321 Experienced Member	Well I think I know it.

8th May 2008, 10:28 PM
Torben Experienced Member	So? What happened? Teacher like it or roast ya? Torben

8th May 2008, 10:49 PM
john1 Experienced Member	Mmm ... Maybe there was someone there with a Higg's Bosun in a sock, maybe the laser slipped and caught the tutor in the eye ... __________________ ************************************************ ***************

9th May 2008, 03:06 AM
Anonymous321 Experienced Member	Well...let's just say that he did ask about the flow of current/electrons. Sniff. Gotta go for now. Another math test tomorrow -_-;

9th May 2008, 05:22 AM
Torben Experienced Member	Dang. Hope you remembered that electrons flow from negative to positive. Anyway, I hope it went OK overall. Good luck with the math test. Torben

9th May 2008, 07:36 AM
deepak george New Member	dudes.........cud anyone out there gimme some walkie talkie circuits

9th May 2008, 06:00 PM
Torben Experienced Member	Hi John, I'm a little confused. Why did you copy out half of Anon's email for me? English is my first language; I had no trouble understanding it. Torben

9th May 2008, 10:54 PM
john1 Experienced Member	Hi Torben, I was agreeing with you. And confirming that she mentioned it correctly before. It wasn't just for you, i copied out a bit from before cos this thread has a lot of watchers, and many of them may not look back to earlier posts. I would still like to know what was asked about "current/electrons" from the tone of Anonymous' post, that bit may not have gone well. I think we both know that some people will bring up aspects of the well known "electric flow" alternatives, sometimes just to generate "lively discussion". Very often this can just confuse people. John __________________ ************************************************ ***************