Yahoo Groups archive

Cgs synth

Index last updated: 2026-04-28 23:16 UTC

Message

Re: Multiplexing chips

2006-12-15 by sasami@hotkey.net.au

>Looking at the Sequential Switch info, am I correct in understanding how
>the 4051 chip operates:
>
>Am I understanding this correctly?

Yes, though as with all CMOS, you would need to have a (100k) pull-down
resistor from each address input to earth to supply the "0" value for when
the switch is off. Also put a 1k resistor between the address input and the
switch to provide protection for the chip.

>If so, there certainly must be a similar chip that has *4* inputs and
>can address 16 steps... can someone point me towards this, or at least
>give me a clue to where I should start looking?

It is the 4067.
You can also use two 4051 with their inhibit inputs being used to select
which chip is on at any given time.

Ken
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.