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71 |
| Author | Views | Views Today | Rank | Comments |
| 125,285 | 111 | |
71 |
| I don't know why, but people like blinking lights. You see LED chasers everywhere, in TV shows (Knight Rider), movies, and store windows. This schematic is my version of a simple 10 LED chaser. There is no 555 timer used because at my local electronics store they are over $4 Cdn. Instead, an oscillator made up of two sections of a 4011 NAND gate is employed. This chip is very inexpensive and extremely common. |
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| To construct a led chaser with more then 10 channels and with various effects with simple circuit diagram. | ||
| my circuit does not work, i followed the circuit but it does not really work, what should i do? | ||
| Well I had stopped working on this circuit, bu t i decided that i was gonna work on it and i am done but revised the circuit(had help with it), i got rid of the 4011 because they fry so easy and used a 40106 trigger and got rid of 1m and .1uf cap changed to 1uf and 47k, works like a champ if anyone wants this circuit just email me and i will send it. | ||
| BSman. Gn is the negative.See left of the R3(at the cornering).But i don't understand either about the 2 power supplies.maybe the second is because of the LEDs. This is my second try on electronic circuits.my first was a "Door Open Counter".My real question is how will i be able to connect a 555 timer istead of a 4011 NAND chipset. E-mail me please as soon as posible. | ||
| Where can I buy pre-built chasers? I've tried to build my own and frankly I suck! | ||
| Ok so i am only 15 and have pretty much self taught myself all i know but this is my first real comlex circuit and i have a couple questions: 1: how many NAND gates do i need and how do i wire them(which pins) 2: How do i connect the leds to the counter ( what pins to connect to) 3: why is there 2 postive 9v inputs an no negetive (mistake right) 4: will smd capasitors and pots work and how do i wire them I think these are all my questions but i have a more detailed post on the forums....or i will soon at least | ||
| If i would like to use 555 IC in this circuit so what can i do for this if any one have circuits for this please mail to me.Thanks to Sender in advance | ||
| This was my first LED project i built in 90s' . Nice work. | ||
| This could be done without the 4017 (U2) by connecting the inputs of the 3rd NAND gate in place of U2, and the 4th gate to the output of the 3rd gate ... so a line of nand gates 4 long. at the outputs of gates 2,3, and 4 connect a LED, or better yet a transistor maybe a 2n2222, 2n3906, or even 2n3907 to drive more LEDs without loading down the feedback loop from gate number 2. This would work because the least number of LEDs to make the chasing effect is 3. To make a long string of chasing lights its simpler to stack sets of 3 where L1x is the first to come on, and L2x is the second, and the L3 set is thrid. L1a-L2a-L3a:L1b-L2b-L2c and so on | ||
| Is there a way to use a 3v supply instead of a 9v supply and still maintain the same brightness?? | ||
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