4532 8 Bit Priority Encoder

[Draal]

I've got a 4532 cmos chip that's labeled as an 8 bit priority encoder and since I haven't heard or seen much regarding this chip, I figured I'd be the guinea pig. It has 8 data inputs, an Enable In/Out, a GS (Group Select output), and of course AB and C address outputs. The ABC outputs go High/low depending on the inputs. Data input 0 is highest priority and data input 7 is lowest. I'm a bit sleep deprived so please feel free to correct me, laugh, ignore, etc. .

My initial testing: I have 8 inputs being pumped with data from my lunetta (shift register, 4040, XOR and AND modules. ABC of the 4532 are then sent out to my mixer with leds on the 3 outputs to give me a clue what's going on. When I hear a change or modulation of the sound, I see the outputs' leds fluctuate quite a bit.

The video clip has terrible sound quality due to my baby sleeping, but the leds tell me something in going High/Low and different intervals. When I change the order of the inputs, I get changes in the patterns. I need to try out other data combinations to see what occurs. Still a lot to tweak hear but if I get ANY kind of variation in my sound pallet, I;m a happy dude. I'd love to explore this more and find what setup gives the best results.

It may very well turn out to be a fool's errand to get something significant out of this chip but heck, a man's gotta try!

[tjookum]

nice work Draal, must be though trying to be quiet with a baby sleeping. Thanks for shooting a video, although I couldn't really see much I could see some interesting patterns there.

Anything in the world of lunetta with 8 in it is worth hooking up to a 4051. Hmm, I would be interested to see how the ABC output of the 4532 could be connected back into the ABC input of the 4051

[Draal]

Yeah, my video in the dark is a bit low budget! I've only had about a half hour to play with different data interconnections today and I hope I get some time tonight; there does seem to be some interesting intervals to play with when I change the input source from say the 4040 to an AND gate's output. I think the key may be to incorporate greater variation from the inputs.

Yes! I plan on hooking it up to a 4051 soon. I have a half finished 4051 cv gen whose 8 outputs were never connected to switches -this may be worth hooking up for a quick test

[DGTom]

Imagine a situation where you have 8 sources, one destination & a UI is implemented in such a way that the user isn't required to know binary in order to select from 1-8 - you have 8 buttons pressing one selects a source to be connected to the destination.

Used with an analogue to digital converter you can have voltage levels control a 4051. In my modular I have a module which routes voltages based on gate inputs - a preset select, instead of a sequencer which cycles thru voltage settings I can "select" a voltage (set by pots) by gating the input that corresponds to the pot.

Combine it with the 4051 / 4017 melody generator, with 8 momentary push buttons you could "play" it like a mini-keyboard, or just feed 8 clocks into it for some nice indeterminate switching.

[Draal]

Thanks DGTom,

That information gives me a direction to pursue. I salvaged this chip from an organ circuit board, so your mini keyboard idea makes perfect sense.

If time permits, I'll be messing with the melody gen tomorrow.

[Draal]

Melody Gen plus 4532 video: I am getting some fun variations from the main 'beat', plenty of sprise clicks, staic, bleepy goodness the longer I run it. Again quick vid during baby naps.

[Draal]

Here's an updated clip of the priority encoder where I ran the output of the 4051 cv Gen into the Enable IN pin of the 4532. By patching different ic's into the EN In, you can modify the pattern a bit. I liked this combination and the addition of the 8 manual switches on the cv generator only adds to the fun .



Plus, not all of the 8 inputs have to be used to get interesting sounds. When I disconnected a few of the inputs on the 4532, more 'melodious' patterns emerged. And when you change the order of what data goes into which pin, further variation emerges.

I think the usage of this chip is a nice alternative to the melody gen and even simpler to construct. In true lunetta spirit, you just run the ins and outs to the panel! And I'm sure that if a noob like me can come up with ways to use this ic, I know the truly wicked can come up with a new spin on it.

I posted this on our other fave site so I'd thought this might be useful to some of ya here on this forum; so forgive the redundancy.

[stolenfat]

MUST... ORDER.... CHIP.... NOW.... *phew*!

[Rykhaard]

Very, very cool to watch! The more that I see from that chip, the more impressed that I am with the possibilities from it. I'll definitely be looking for that chip, the next time I'm at our local supplier, or putting an order in from one of my 2 suppliers.

[Draal]

Thanks for the feedback guys ! I've had a lot of fun playing with this chip. Another cool feature is that you can add more 4532 chips to the enable Out pin for even more inputs.

Time to wire this baby up to the panel.