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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Anybody used a ALU before (40181 or 74181)??
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okelk



Joined: May 08, 2014
Posts: 29
Location: Vienna

PostPosted: Thu Jul 03, 2014 6:06 am    Post subject: Anybody used a ALU before (40181 or 74181)?? Reply with quote  Mark this post and the followings unread

Has anybody used an ALU (Arithmetic Logic Unit) before?

I thought it could be used as 8 input, 4 output digital multi function module.

Or you could build a extremely simple "DSP" (haha)-bitcrusher-effect-stepped tone gereator-whatever-thingy using a 40181 (hard to get) or sn74ls181.
Just put 2 4-bit ADCs (whats the easiest way to get a 4 bit adc??) in the data inputs, use a hex rotary switch to select the instruction, use a oscillator (variable frequency 4046 or just a crystal) to generate the clock and a simple r2r 4-bit dac on the output.

what do you think?
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commathe



Joined: Jul 26, 2013
Posts: 84
Location: Beijing
Audio files: 5

PostPosted: Thu Jul 03, 2014 6:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

You could use an LM3914 and a 10-to-4-line priority encoder to get an easy 3.5-bit ADC. However, I've never tried this. I don't know anything about the speed of the LM3914, it's meant for driving LED displays so it may be too slow. It's outputs are also LED drivers that pull low so you would need to convert them some how.
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