This thread is for the discussion of the Flashing LED circuit.
Circuit URL:
http://www.555-timer-circuits.com/flashing-led.html
Circuit URL:
http://www.555-timer-circuits.com/flashing-led.html
Flashing LED
- Thread starter Admin
- Start date
Data sheets depend on what model the capacitor is. The average capacitor is 1/3rd of an inch apart from the leads, I used these dimensions for my "Dummy Alarm Circuit" circuit board construction and it worked just fine.
My hobby is model railroading and I like to build my own circuits. My track power runs off of AC, there are decodes in the engines that convert the power to DC to make them run. I'd like to use this flasher for in the last car of the train for the flashing light on the rear. I built this circuit on a breadboard and it works fine from a 9v battery. When I try to power from track power the LED stays on and doesn't flash. I used a bridge rectifier to conver AC to DC. I'm then using a LM317T from RadioShack. I wired that according to the directions on the package. I checked the in and out voltage. In is 18v out is 9v. What am I missing or not getting to get the LED to flash from track power?
I ran into the same issue as well. I fixed it by swapping out for a 1 uF cap that's not electrolytic, I had a bunch of these left over from a couple of semesters back:
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_null_1841127_-1
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_null_1841127_-1
So I'm going to be making this circuit next. I'm back in electronic technology class so I get to make more of these 
Instead of just doing 1 circuit this year I'm hoping to do three. This one, one my teacher gave me (This one is Surface Mount Technology so I might start working with those soon), and another one from this site. I'm not sure which one I should do next? Any recommendations? Nothing too hard I'll post my CAD drawing of this circuit tomorrow when I'm back in that classroom. It's already finished and all I need to do is design the next circuit so we can make all three of them at once to save time and not have to go through it all over again
Instead of just doing 1 circuit this year I'm hoping to do three. This one, one my teacher gave me (This one is Surface Mount Technology so I might start working with those soon), and another one from this site. I'm not sure which one I should do next? Any recommendations? Nothing too hard I'll post my CAD drawing of this circuit tomorrow when I'm back in that classroom. It's already finished and all I need to do is design the next circuit so we can make all three of them at once to save time and not have to go through it all over again 
So I'm going to be making this circuit next. I'm back in electronic technology class so I get to make more of these Instead of just doing 1 circuit this year I'm hoping to do three. This one, one my teacher gave me (This one is Surface Mount Technology so I might start working with those soon), and another one from this site. I'm not sure which one I should do next? Any recommendations? Nothing too hard I'll post my CAD drawing of this circuit tomorrow when I'm back in that classroom. It's already finished and all I need to do is design the next circuit so we can make all three of them at once to save time and not have to go through it all over again
Instead of just doing 1 circuit this year I'm hoping to do three. This one, one my teacher gave me (This one is Surface Mount Technology so I might start working with those soon), and another one from this site. I'm not sure which one I should do next? Any recommendations? Nothing too hard I'll post my CAD drawing of this circuit tomorrow when I'm back in that classroom. It's already finished and all I need to do is design the next circuit so we can make all three of them at once to save time and not have to go through it all over again
We're making our own. We're going to mill a copper PCB board and have it draw in the paths. We also are going to do the chemical process (Forget what it's called) where shine a light over the circuit with a printed outline to prevent that part from washing away, dump in it some chemicals (warm and moving) to wash away the unwanted copper, then just rinsing it off, drilling the holes (Not for the SMT circuit), and soldering the parts on. We're not going to be buying other boards online because it's part of the module to make one.
like this, but we're using slightly different tools
like this, but we're using slightly different tools
So you will be photo-etching your own boards... Check out a couple of these sites for some ideas:
http://hackedgadgets.com/2006/06/24/photo-etch-circuit-board-process/
http://www.ianjuby.org/pcb/pcb.html
http://www.sm0vpo.com/data/pcb2.htm
http://hackedgadgets.com/2006/06/24/photo-etch-circuit-board-process/
http://www.ianjuby.org/pcb/pcb.html
http://www.sm0vpo.com/data/pcb2.htm
Ran into this as well... I ended up swapping the 1uf with a 100uf (worked fine)... Then I wanted to power it with a 4.5 volt remote control so I swapped out the 470k resistor with a 10k resistor and added a second LED... This circuit will eventually end up as navigational blinkers in a starship model... Here's a video of the breadboard layout:
You need to tell your school that if they expect you to build a surface mount board they need to get you one of these.
Now if they ever come out with one of those that makes grilled cheese sandwiches, grills a perfect steak, press and fold my clothes all while building surface mounted boards I might get one...
Hi! I have seen another circuit for LED flashing lights. If anybody interested to try this, visit LED Blinking Circuits. It includes 2 circuits - one is for Bicolor LED dancing lights, the other one is for LED flasher circuit.