September 26, 2020

74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, 3-STATE 1-of-8 Line Data Selector/Multiplexer. NOTES: a. 1 TTL Unit Load (U.L.) = 40 µA HIGH/ mA LOW. SN54/74LS 8- INPUT MULTIPLEXER. WITH 3-STATE OUTPUTS. LOW POWER SCHOTTKY. 74LS datasheet, 74LS circuit, 74LS data sheet: HITACHI – 1 of 8 Data Selectors/Multiplexers(with strobe and three-state outputs),alldatasheet.

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If you used more advanced chips common anode leds You’re using a lot of terminology that is new to me. So I’m basically looking to do something like this, right?

74LS251 Datasheet

You don’t want two paralleled pins to have different logic states. Do you have a schematic? This should prevent short circuiting them. Per article in the playground, chips can be wired such that they logically form a chain.

It’s not guaranteed to last forever, but I’ve done it.

IC Datasheet: 74LS : Free Download, Borrow, and Streaming : Internet Archive

I don’t consider his leds as ‘bright’. As per its datasheet the can source 20mA or thereabouts and sink a bit more per channel. Data is sent to the first chip and gets forwarded to the 2nd and so on.


How bright will it be? This assumes that the daisy-chained and paralleled ones get the same data of course.

Remember that you’re dealing with a real noob here. As I answered on instructables, my blog is your friend. You’d still need current limiting resistors. Where on the schematic do they need to go? If you desire more information for a better way to do it, have a look at Grumpy Mike’s website. If two or more channels are physically wired to act as one, this number can go up.

What do you mean by “de-activating the output drivers”? He’s built an RGB monome. Such an arrangement would live long enough to finish a presentation, possibly longer if not used abusively.

This is bright er: It has everything if you use shift registers only you’ll need. If you’re in a moderately lit room it will be clearly visible.

What do you mean by three resistors per LED? The human eye is quite adaptable. What do you mean by daisy-chaining and piggy-backing, exactly? These powers can only sink current. Having said that, I can’t stress how grateful I am for your help.


They are quite dim. If you do that, make sure to de-activate the output drivers with the ‘enable’ pin until the new data has been shifted in.

How would I wire all of this? I don’t know if I’m being helpful I bet the person in the video has chosen the current limiting resistors a bit on the conservative side. Most if not all of the available led drivers can’t be used with your common cathode leds How bright will it be Maybe as bright as the LED of an optical mouse in power save mode, not when it’s scanning the surface.

If you’re in a cave, you’ll be fine.

ON Semiconductor 74LS Series Datasheets. SN74LS, 74LS Datasheet.

Also he’s not multiplexing at all, which makes it dimmer again. It looks a lot brighter on the photo than what your eyes will tell you.

You mean that each anode pin on each LED needs a resistor? Also, when you say “it’s not guaranteed to last forever,” what does that mean?