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[fr0zt]

Hey, just wondering how a chaser circuit works and what is needed. I suppose a chip would be used and each LED would be individually attached. This would be under the jewel to create a spinning light effect.

[xp-power]

QUOTE(fr0zt @ Mar 29 2005, 06:21 PM)

Hey, just wondering how a chaser circuit works and what is needed. I suppose a chip would be used and each LED would be individually attached. This would be under the jewel to create a spinning light effect.

search there are tut's and premade ones in the B/S/T

[weeman666]

markland sells premade ones that go under your jewel for 15 bucks + shipping. but you have to provide your own leds, you can also find premade ones cheaper with leds already solderd in and variable speeds and different paterns, for 12 bucks plus shipping too ill have to find the link to that site.

[brojimh]

The coolest one I've seen is the one I bought here:  http://www.newagepsx.com/cart/view_product.php?product=201

[fr0zt]

I'm not looking for where I can buy a pre-made one, I'm looking to how to make one and what components are used.

[xzphatboizx69]

QUOTE(fr0zt @ Mar 29 2005, 03:13 PM)

I'm not looking for where I can buy a pre-made one, I'm looking to how to make one and what components are used.

click the link in my sig, then type chaser circut tut.

[Zodiiak]

There's more than one way to build a chaser circuit.  There's more programmable methods, and there are hardware methods.

If I get the chance, i'll send you my schematic (did one a few semesters ago out of boredom).  

A simple search turned up this schematic:
http://www.aaroncake.net/circuits/chaser.htm

[weeman666]

QUOTE

The coolest one I've seen is the one I bought here: http://www.newagepsx.com/cart/view_product.php?product=201

cool yet very expensive.

[fr0zt]

I can see that there are people who are selling pre-built ones, but I am looking for shcematics on how to build them and what parts are needed. Also if there is a way to attach more than just 16 LEDs.

[fr0zt]

Here are 2 different chaser circuit shcematics... 1 is a 6 LED circuit, and the other is a 10 LED circuit, I guess I would have to use a different chip for U2 that has more legs. Anyone know how I would change one of these circuits to support 32 LEDs?

(IMG:http://www.aaroncake.net/circuits/chaser.gif)
Parts:
R1   1   1 Meg 1/4W Resistor   
R2   1   100K Pot   
R3   1   1K 1/4W Resistor   220Ohm if using blue LEDs
C1   1   0.1uF 16V Ceramic Disk Capacitor   
U1   1   4011 CMOS NAND Gate   
U2   1   4017 CMOS Counter   
LED1-10   10   LEDs Of Any Colour   
MISC   1   Board, Sockets For ICs, Knob For R2

And the other one: (this circuit uses incandecent lights instead of LEDs)

(IMG:http://www.oz.net/~coilgun/kitt_car/images/scanninglights.gif)
Parts:
R0 / R5 - 2.2K ohm resistor (six required)
R6 - 2.2K ohm resistor
R7 - 1.0K ohm resistor
R8 - 5K ohm linear taper potentiometer (for speed control)
R9 - 1K ohm (for pilot light)
C1 - three 4.7 uF capacitors in parallel
Lamp 0 / 5 - incandescant 50 mA 12v dc panel light (six required)
LED1 - red pilot light
Q0 / Q5 - 2n2222 pnp transistor (six required)
U1 - NE555 timer
U2 - CD4017 decade counter decoder
S1 - spst switch (for on/off switch)

This post has been edited by fr0zt: Mar 31 2005, 07:20 PM

[xp-power]

u noticed on the first one it say 9v

[ShastaO]

QUOTE(fr0zt @ Mar 31 2005, 12:20 PM)

And the other one: (this circuit uses incandecent lights instead of LEDs)

That means you can take out all those 2N2222 transistors.  They just amplify the current for the incandescent lamps.  LEDs won't need that much current.  Here are directions for an easy project featuring the 4017 that will give you a good idea how it works and how to apply it to your project.  I bought some 4017s to mess around with and got a cool-looking chaser working using the circuit on that page.

You can also connect more 4017 chips if you want to increase the number of LEDs, but I'm not exactly sure how to do it.  I know I've seen directions for this online, though, so if you dig around enough, you'll surely find it.

[fr0zt]

Ok, so here's that one. Been looking around for how to add more chips or just use a bigger chip, but I haven't found anything.. anyone got any ideas?
(IMG:http://www.kpsec.freeuk.com/images/heartc.gif)

[ShastaO]

Get the datasheet for the 4017 chip here (PDF).  On the last page of the datasheet, it shows how to use multiple 4017 chips to make longer sequences.

This post has been edited by ShastaO: Apr 2 2005, 11:39 AM

[fr0zt]

That shows how to attach 3 together, if i wanted 32 LEDs, I'd need 4 chips with 8 outputs each.. How would the schematics look with 4 of the chips worked into the circuit with the 555 timer?