Police Lights

[daniel]

Yes, it doesnt look right the way it flashes right now, but onece installed in model where red and blue is roof light and white are head and tail lights it will look tight. I dont know who makes them leds but I can give you specs on them if you want.

 

[Justin]

Yes, it doesnt look right the way it flashes right now, but onece installed in model where red and blue is roof light and white are head and tail lights it will look tight. I dont know who makes them leds but I can give you specs on them if you want.

I would like the specs, thanks!

 

[daniel]

I would like the specs, thanks!

 

[George]

Yes... Size became issue as soon as I start laying out pcb with both counters. So after couple of unsuccessful shrinking attempts I decided to make modifiable board that can be sandwiched on the top of another one, thus giving me two (or more) circuits connected into each other.

Work still in progress but here is what I got so far actual size is 2" x 2.25"

One timer can drive multiple boards (hopefully, not tested yet) or each can have one for different timing
and each board counter can be configured differently using jumpers

Have you considered using surface mount components? The entire project would fit on a 2 X 3cm board (.75" X 1.2"). The parts are very inexpensive also as well as a tube of solder paste. You could also save more space by using multi colored Led's. Sorry if this was alredy thought of or posted it is Just a thought.

 

[daniel]

Have you considered using surface mount components? The entire project would fit on a 2 X 3cm board (.75" X 1.2"). The parts are very inexpensive also as well as a tube of solder paste. You could also save more space by using multi colored Led's. Sorry if this was alredy thought of or posted it is Just a thought.

Very true.

That would make the board with super tight clearances easy to bridge over when soldering.
Definitely not home made, but when size matter well worth it to have them make it.

 

[George]

Very true.

That would make the board with super tight clearances easy to bridge over when soldering.
Definitely not home made, but when size matter well worth it to have them make it.

Making those at home is something you can do. There are many youtube videos on doing it without the expensive reflow equipment and pick-n-place machines. I have not attempeted a project like that yet myself but will soon. I might change my post after I try it myself LOL.

George

 

[dongmarz]

hello admin! im new here .. uhm, im looking for a PCB lay-out of police lights that can handle 16red and 16blue.. i need a pcb lay-out couzi dont know how to read schematics and i dont have much knowledge in electronics... hope u can provide me.. ;( im using that for my personal use.. thank you..

 

[Fleck]

What's wrong with Daniels PCB layouts above? You will have to use bigger transistors for yours though. BC337 can handle more current, can't remember the numbers, check the data sheet.

Rich

 

[Fleck]

Just looked, it's 800ma so these would be fine.
Wire 4 arrays of 4 LEDs in series with a resistor(value dependent on supply voltage)= 16 in total on each side

 

[dongmarz]

ok fleck... thanks... from daniels pcb lay-out and components, can it handle 16red and 16blue? with 12v DC source?

 

[dongmarz]

what schematic did you use for that lay-out...? police lights-2...? i have here a copy,arexthere changes or additional components?

 

[Fleck]

Yes use police lights 2. Change the BC547 transistors to BC337. There's loads on eBay.
Ground the unused outputs on the 4017 chip and connect a 100nf capacitor across the supply.

Also I would consider making this project on vero board, you still have to solder but there is no etching required.

 

[dongmarz]

ahh...ok, fleck... thanks for the help... uhm if you dont mind, maybe its nice if i have a copy of yours coz i used pcb like a vero board... uhm, when looking at the schematic, where can i put the 100nf capacitor...? sorry for that, as what i said, i dont have much knowledge in electronics...

 

[dongmarz]

ahh...ok, fleck... thanks for the help... uhm if you dont mind, maybe its nice if i have a copy of yours coz i used pcb like a vero board... uhm, when looking at the schematic, where can i put the 100nf capacitor...? sorry for that, as what i said, i dont have much knowledge in electronics...

 

[Fleck]

http://i119.photobucket.com/albums/o151/fleck_bucket/DSC01443.jpg

 

[Fleck]

The copper strips on the other side go up and down. You can get a little tool to 'drill' out the tracks between the chip pins and any other places its not needed. Or you could use a 5mm drill bit i suppose

 

[Fleck]

The capacitor is shown here. This size dont have polarity and can be connected any way round

 

[dongmarz]

http://i119.photobucket.com/albums/o151/fleck_bucket/DSC01443.jpg

you do have a bottom pic of that..? coz i cant see where to connect the components and jumper..

 

[dongmarz]

The capacitor is shown here. This size dont have polarity and can be connected any way round

uhm...thanks for the sketch fleck... this so usefull for beginners like me..

 

[Fleck]

Sorry i didn't take any more pictures of it. If you buy some veroboard it will become clear where to put the components. There are no jumper wires on the other side just vertical copper tracks with breaks in them where necessary.
Maybe try building something smaller first to get used to using it.