Author Topic: Schematic review request - 555 timer led-cube, with actual pattern  (Read 3025 times)

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Offline HuulivoideTopic starter

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  • Country: fi
I was hoping some could go over my schematic for 555 timer 3x3x3 led-cube
with an actual real pattern in it. Not just a CD4020 as seems to be popular
on the interwebs.

Sorry for the, somewhat messy, layout.



The 4000 series chips in gschem, seem to be missing power pins from
the symbols. So just assume the same ground and 4.5v supply for the 4029,
4514 and 4017 chips.

Pattern goes from layer 1 to 2 to 3 to 2 and then loops back
to beginning. 1st and 3rd layers are the same, 2nd layer is a reversed
version of it.

Spots that I think could problems.
1. 4029 counter's UP/DOWN pin's pull-down resistor.
2. The 4001 latch implementation.
3. 4514, strobe pin. Do I need to input a clock signal here to make it work?
4. The led circuit's general transistor structure and the base resistor values.


List of parts that I believe should provide working blinker.
* BC547B as the NPN transistors
* BC556B as the PNP transistors
* As for leds: 20mA, 2.6 Vdc
* 1N4004 as the diodes.


List of IC chips used with descriptions of their purpose and links to datasheets:

555: Used to generate clock signal for primary layer animation counter.
http://www.ti.com/lit/ds/symlink/ne555.pdf

CD40001: NOR-gates, used to create a latch to switch animation direction.
https://www.fairchildsemi.com/datasheets/CD/CD4001BC.pdf

CD4029: Used as 4bit binary counter.
http://www.ti.com/lit/ds/symlink/cd4029b.pdf

CD4515: 4bit to 16 output decoding of the animation counter.
http://www.ti.com/lit/ds/symlink/cd4029b.pdf

CD4017: Decade counter, used to switch between layers, at the end of an animation cycle.
http://pdf.datasheetcatalog.com/datasheets/90/108738_DS.pdf

CD4070; XOR-gates to drive the layer power PNP-transistors with the CD4017.
http://datasheet.octopart.com/CD4070BCM-Fairchild-datasheet-76777.pdf
« Last Edit: October 26, 2015, 10:42:40 am by Huulivoide »
 

Offline alsetalokin4017

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Re: Schematic review request - 555 timer led-cube, with actual pattern
« Reply #1 on: October 28, 2015, 04:36:44 pm »
Sure seems like a lot of trouble and a high parts count for not much pattern flexibility. Are you doing this as an exercise in TTL or something? More power to you, I love analog discrete circuits myself, but my eyeballs cross when I'm trying to figure out someone else's circuitry.

I made a 4x4x4 cube and drove it with an Arduino Mega, so any pattern is easy to implement in software without making any hardware changes. Only 4 drive transistors and a handful of resistors are needed external to the Mega.



Even this is pretty lame compared to some of the mcu-driven LED cubes out there.
The easiest person to fool is yourself. -- Richard Feynman
 


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