Mini Digital Lighter
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555 timer display questions and LS93 wiring question?
I have two questions. I am an electrical engineering student and thought that using a 555 timer would be a great way to construct a digital Christmas light mini display that I want to make on my own. My question is do they have big enough IC's to operate 120V so I can output to quite a few LEDS? Or do I need to construct a 555 from the basics of inverters, Comparators, and a latch?.
The second question is a little more important right now. I have made a 55 timer to output 1 Hz and I need to take this frequency and input it into a LS93 Motorola decade counter to divide by 16 and 10. I have hooked it up like our text shows, but I am definately not getting 1/16 and 1/10 outputs to my LEDS. DOes anyone have a way to wire this counter to output what I am looking for. The data sheet is at --- electronics-diy.com/download.php?pdf=74ls90.pdf---
Thank you
There is no such thing as an IC that will operate from 120 volts.
Use a lower voltage like 12 volts, and then drive a relay with a 12 volts DC coil that can switch 120 VAC.
And a 555 you construct from the parts you list will still not operate at 120 volts, unless you get a bunch of (expensive) 300 volt transistors and build it up from those.
It would be easier to use LS90 divide by 10.
.
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January 24th, 2009 in
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camera,
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