[sdiy] 4067 for sequencer multiplexing?

[mark verbos]

my current sequencer project uses a 4515, 4514 and 3 4067's on each channel.

The 4515 is for the LEDs, the 4514 is for the trigger out jacks, the 
4067's take the out s formt he pots and the panel switches. They decide 
which step is on and they eliminate the summing section from a normal 
sequencer design. I do have an opamp buffer after the CMOS though anyway.

The reason I went this route was because there are 3 rows that share one 
row of reset-nothing-trigger switches and they address those switches at 
their own rate. So 15 volts goes to the switch centers, then the sides 
each go to three 4067's for decoding. One side for resets and one side 
for trigger output.

The only problem with the 4067's was that they were the most expensive 
CMOS chips I could find. Here in Germany I Farnell wanted like $3.50 for 
them. I ended up finding them for about $2 and i think that you can get 
better prices on everything in the states.

mark

Peter Grenader wrote:

>Have any of you guys (and gal) ever considered using or used a 4067 for a 16
>step sequencer?  It's an interesting little bug as it is actually a bank of
>analog switches which are addressed by 4 bit data with a common
>input/output.
>
>So, you want to pass a low out as true, you ground the common.  You want a
>high, you connect a high at the common.  In that this project I'm cooking up
>is going to be gargantuan, I'm going to use line drivers after to boost the
>umph for 4 banks, a pulse out, a programmable pulse out AND an LED per tap,
>so I'm not all that concerned with it's internal strength as there will be
>no fan outs.
>
>any info would be terrific.
>
>thanks,
>
>P
>
>
>