'Mixers'

Pehr · Posted: Tue Feb 12, 2008 3:07 am Post subject: 'Mixers'

Could the 4072 dual 4-input OR gate be used as as some sort of mixer? Or would the output be contantly High?

blue hell · Posted: Tue Feb 12, 2008 6:09 am Post subject:

"mixing" in the normal sense is troublesome ... an "or" is high on the output when at least one input is, and an "and" would be low when at least one input is low, so there is a lot of masking. An "xor" masks less, but it introduces the "pseudo ring modulation ". A possible alternative would be to mix with a couple of resistors (and one going to ground).

All variations could be interesting of course Very Happy

Pehr · Posted: Tue Feb 12, 2008 6:55 am Post subject:

blue hell · Posted: Tue Feb 12, 2008 6:57 am Post subject:

andrewF · Posted: Tue Feb 12, 2008 7:12 am Post subject:

how about this -

mixer.jpg

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Uncle Krunkus · Posted: Tue Feb 12, 2008 7:55 am Post subject:

Hmmmm,
Kind of a digital Lasagne effect.
Yum!

Pehr · Posted: Tue Feb 12, 2008 7:59 am Post subject:

A mux-mixer and an adder, got it! Lots of ideas coming to me now Very Happy

loss1234 · Posted: Tue Feb 12, 2008 11:59 am Post subject:

hey andrew-what book was that taken from? it looks like a cool book

andrewF · Posted: Tue Feb 12, 2008 4:26 pm Post subject:

mosc · Posted: Thu Feb 14, 2008 3:32 pm Post subject:

My experience is that a gate can be used as a mixer, but sometimes the effect isn't what you want.

It's perfectly OK to build an OP amp analog mixer in your Lunetta. This is especially useful as a final output device.