Mux and Demux

398

04:13:38

This circuit uses a 4 bit multiplexer (mux) on the left to turn a parallel binary code (whatever you decide to input) into a serial data stream (highlighted) starting at the lsb and moving to the msb. The single serial input is recieved by the demultiplexer (demux) on the right, and converted back into parallel. The value is then stored in memory for one full cycle to allow the entire message to be loaded (if it wasn't stored, you would only get pieces of the message) and finally loaded from memory for display. After this happens memory is cleared to allow it to load new data and the cycle is complete. Wish I had more room to ad an a/d converter.  Looking forward to any input or comments. Have fun. -Jolly

published 10 years ago

Sine_eyed

10 years ago

Wow- well done! It's a great layout. So, what did it take you, about 10 minutes it so to put this all together?.. ;^)

njolico

10 years ago

So after playing with this for a bit, I found that if you speed the clock up, the circuit will not work like it's supposed to because the serial bus can't drop the voltage fast enough and the trailing edge is more like a trailing gentle hill. I'm not exactly sure whar to do to fix this. I dropped the resistance of the 100 ohm resistor, and put some "ballasting" resistors for lack of a better term between the gates, and it does work, but it draws much more current than I would like it to. Right around 40mA. Any suggestions?

jose1979

10 years ago

have problems at high frequency by the diode.

jose1979

10 years ago

http://everycircuit.com/circuit/5916998712164352

njolico

10 years ago

Thanks Jose!

jose1979

10 years ago

Encantado

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