T&L Publications

Well, there is my next house alarm/car alarm!

Bad guy gets in, turns on car lets say, and poof!

~Kam (^8*

Whats your plan for the heat build up? I'm playing with smaller LED's (3.5v@350mA / 42 Lumens), not the 1000mA you have, and that single LED builds up alot of heat.

~Kam (^8*

One more gang, I'm trying to figure out what resister I need from the pic to npn. My PIC16f688 says that the max output current sourced/sunk by any I/O pin is 25mA. I tried a 470ohm resister and man oh man, that makes all the difference (thats the 470 on the base). I always thought that the transist...

Hi all, Thanks for the reply. And yes, I have been thinking of the transister as a switch and not a valve. I now understand why I need more power to the Base. Very interesting, never knew that. Here is the URL for the company where I got my LED's http://www.luxeonstar.com/ I have the "star"...

Hi all, thanks for the replys.... LED specs: 3.99v/350mA max rating. (1 watt LED) I am going to use 3.5v@330mA. This is how I derived the 7.5 res=(6v - 3.5) / .330 = 7.58 ohm, 0.825 watts I am using a 1 watt resister. About the Base, it seems to be working, I'm not sure I fully understand the issue ...

ooops, error


+6v --> LED +
Gnd --> res 7.5 ohm --> npn Emittor
npn Collector --> LED -
npn Base --> res 10k --> pic pin

If I put my meter on npn Emittor and +6v, I get 317mA

If I put my meter on npn Collector and +6v, I get 60mA.
~Kam (^8*

sorry for the delay! I have a LED that I want to light. Here is my setup (LED side) +6v --> LED + Gnd --> res 7.5 ohm --> npn Collector npn Emittor --> LED - npn Base --> res 10k --> pic pin I can toggle the LED just fine. If I put my meter on npn Collector and +6v, I get 317mA If I put my meter on ...

JPKNHTP,

Thanks for the reply. To be totally honest, I'm not sure I understand...

why am I not getting the same voltage from whats being pushed into the Collector, and whats being sent from the Emittor?

~Kam (^8*

Hi all!

I've gone mad.

Said that...

I'm trying to send 350mA thru this npn

link to npn

I send 317mA into (C)
I get 60mA from (E)

From the specs, I thought it could handle that voltage...

Have I gone mad?!

~Kam (^8*

Matt,

Don't give up! So what if Walmart has it too. It just validated your idea! You learnt alot from this project I'm sure, move to the next one, or just make yours better!

But keep on trying.

We all need a cheerleading section...

~Kam (^8*