[sdiy] 4016 madness

[megaohm]

Is this a private endeavor or are the schematic(s) public?

When I have had problems with CMOS many times it turns out to be the
circuitry/components driving the logic inputs that are lacking. If
anything before the logic input is slewing the trigger or on/off
signal you can get problems.
That's my suggestion. Look at the signals pre 4016 inputs. Do they
have quick transitions?
What voltage levels are these signals in their On/Off (Hi/Lo) states?
Does it make sense in the context of your circuit?

I imagine having to find a specific manufacturer of any given chip
would be a real PITA.





On Sat, Mar 5, 2011 at 2:42 PM, mark verbos <mverbos at earthlink.net> wrote:
> Hi there!
>
> I'm in the middle of some strange analog switch behavior. I have a buchla module that used an MC14016 in it's oscillator core. It is also switching between waveforms with the other 3 switches. It is powered from +15 and a -5 made from resistors on the -15 and ground. Things are acting funny, so I replaced the switch with a CD4016B and the oscillator stopped working. I put in an NTE4016 and still no oscillation. Both of these chips were showing about +5 as the negative rail. I put back in the old chip and the oscillator started again. The negative power rail went back to -5.
>
> The schematic specifies the Motorola part number MC14016. I have never seen Don specify a Motorola CMOS switch. I don't know if the issue is that it's Motorola or an A vs B series thing.
>
> I'm in LA right now and can't go home without figuring this out. Does anyone have a Motorola MC14016 (not B) in the LA are that they can float me? Any words of wisdom? Thanks!
>
> Mark
>
>
>
> Sent from my iPhone
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