- September 26th, 2011, 3:44 pm#347659
Cool, thanks
Because we're grown-ups now and it's our turn to decide what that means.
jackdoud wrote:Yup, that's the final schematic. Here it is again since it's on the last page:Wow, thank you! I just might try doing my lights myself
Here's a parts list:
19x NPN Transistors (pretty much any will do, I use 4401's)
2x 4015 Quad Shift Register
4x Red LED
15x Blue LED
1x 555 Timer
1x 4017 Decade Counter
1x 9v Battery Clip
1x 1uf Electrolytic Capacitor
1x 50kohm Potentiometer
16x 10kohm Resistor
19x 470ohm Resistor
1x 51kohm Resistor (these can be tricky to find, a 47kohm will probably work instead)
Useful other parts:
Breadboard
Header Pins
Ribbon Cable
Hookup Wire
8-pin IC Socket
16-pin IC Sockets
Heat Shrink Tubing
Jameco may or may not have everything, I order from Futurelec who does have everything and they're cheaper than Jameco, Digikey or Mouser.
jackdoud wrote:Ok, I FINALLY stole a camera to take a video of some finished lights. They start out at mid-speed, then I turn them all the way down, then all the way up, then back to mid-speed.Wow man, that's awesome! Nice clean board, too. Curious... how did the switch being far away mess with the circuit, and how did a cap fix it?
One note, the switch in this vid is on 7 feet of wire to run to the thrower. It turns out this messes with the circuit and causes the powercell to run wrong. I fixed it by adding a capacitor between power and ground, I used a .01uf metal film but pretty much anything should work.
IPv6Freely wrote:Wow man, that's awesome! Nice clean board, too. Curious... how did the switch being far away mess with the circuit, and how did a cap fix it?The length of wire can do a lot of wierd things like change resistance and do odd inductance stuff. The decoupling capacitor cleans up the signal between power and ground by smoothing little fluctuations out of it. That's about as much as I understand of it, circuit voodoo gets wierd fast.
jackdoud wrote:I hear ya, I'm just learning all this stuff. Despite buying light kits from R2DEVO, I'm still going to try my hand at building a set of pack lights, just for fun and learning sake.IPv6Freely wrote:Wow man, that's awesome! Nice clean board, too. Curious... how did the switch being far away mess with the circuit, and how did a cap fix it?The length of wire can do a lot of wierd things like change resistance and do odd inductance stuff. The decoupling capacitor cleans up the signal between power and ground by smoothing little fluctuations out of it. That's about as much as I understand of it, circuit voodoo gets wierd fast.
zappa1971 wrote:ok. it is working, but running fast, then it will just stop and freeze. after a minute it will start back up. ?Could be a charge buildup on ground. Try putting a capacitor between power and ground.
zappa1971 wrote:When you say the resistor values, do you mean the ones on the LEDs? I'll add a 10k with the 470 and see what that doesNo, the speed is controlled by the 555, i'm talking about the 47k (or if you found a 51k like I originally used) that goes between pins 8 and 7 on the 555.
Yep, and nightmare on elm street dream warriors.
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