Hi all,
First of all let me apologise in advance if I've broken any rules, I'm new to this forum and not sure if I'm posting in the right forum or if my questions have already been answered on page 8...
Basically what I am looking to do is to connect in the region of 150 LEDs together to flash alternatively 75 at a time. I have a basic understanding of electronics but it's been a long time since I've done any seriously/practically.
I am using a mixture of (apparently standard) 3mm and 5mm LEDs, and would like the batter(y/ies) to last for a few hours (although as long as it lasts long enough to make an impression, perhaps an hour or two would be fine).
By looking at some of the other threads, it appears connecting 3 LEDs in series with a 75 Ω resistor then connecting many of those in parallel is the general way forwards. What I am really wondering is, how can I connect many of these circuits together in a safe manner, and how can I get half of them to flash alternatively?
Thanks in advance, any constructive criticism is welcome!
First of all let me apologise in advance if I've broken any rules, I'm new to this forum and not sure if I'm posting in the right forum or if my questions have already been answered on page 8...
Basically what I am looking to do is to connect in the region of 150 LEDs together to flash alternatively 75 at a time. I have a basic understanding of electronics but it's been a long time since I've done any seriously/practically.
I am using a mixture of (apparently standard) 3mm and 5mm LEDs, and would like the batter(y/ies) to last for a few hours (although as long as it lasts long enough to make an impression, perhaps an hour or two would be fine).
By looking at some of the other threads, it appears connecting 3 LEDs in series with a 75 Ω resistor then connecting many of those in parallel is the general way forwards. What I am really wondering is, how can I connect many of these circuits together in a safe manner, and how can I get half of them to flash alternatively?
Thanks in advance, any constructive criticism is welcome!