L ljcox Well-Known Member Apr 13, 2007 #22 Here is the full system. I did not include the 100 nF bypass capacitors as in the previous. You need one across Vcc/Gnd of U2, 3 & 4. Let me know how it goes and if you have any problems. I looked at the data sheet for the 74HC595 and the max Vcc current is 70 mA. So the LED current should be < 8 mA since 8 x 8 = 64 mA which is close to the max. Attachments Full system.png 113.1 KB · Views: 213
Here is the full system. I did not include the 100 nF bypass capacitors as in the previous. You need one across Vcc/Gnd of U2, 3 & 4. Let me know how it goes and if you have any problems. I looked at the data sheet for the 74HC595 and the max Vcc current is 70 mA. So the LED current should be < 8 mA since 8 x 8 = 64 mA which is close to the max.
xxxxxxxxxxxxxx Member Apr 14, 2007 #23 Thanks a lot. i don't have the materials to prototype this yet, Ill let you know in a few months, once I have everything else out of the way...
Thanks a lot. i don't have the materials to prototype this yet, Ill let you know in a few months, once I have everything else out of the way...
O on1aag New Member Apr 14, 2007 #24 Light chaser. If you can't get enough of it, here's another one. on1aag. Attachments Light chaser.GIF 12.8 KB · Views: 609
L ljcox Well-Known Member Apr 14, 2007 #25 on1aag said: If you can't get enough of it, here's another one. on1aag. Click to expand... That's a good solution. However, at power on, some LEDs are likely to be lit since the SRCLR does not clear the store. That is why I added R4 & D2.
on1aag said: If you can't get enough of it, here's another one. on1aag. Click to expand... That's a good solution. However, at power on, some LEDs are likely to be lit since the SRCLR does not clear the store. That is why I added R4 & D2.
S sparky222 New Member Oct 16, 2007 #26 Hi all, I just built this circuit (ljcox) for some christmas light flashers and it works perfect. Ive got the triac outputs opto isolated and the circuit runs from a reactive supply easily. Gaz
Hi all, I just built this circuit (ljcox) for some christmas light flashers and it works perfect. Ive got the triac outputs opto isolated and the circuit runs from a reactive supply easily. Gaz
L ljcox Well-Known Member Oct 16, 2007 #27 I'm glad to hear that it works perfectly. Thanks for letting me know.