[sdiy] CMOS counter abnormalities

[René Schmitz]

Hi Karl,

Karl Ekdahl wrote:
> Hi list... i've been working on a analog sequencer for
> a little while now and discovered that all my 4029
> behaves really weird. First of all, they need a
> decoupling cap to CP in to work at all, really strange
> since my clock source is +-15v (i did cut the negative
> part using a diode and a pull-down). Second, all
> outputs give the same frequency out; the same as CP
> in. Third, the outputs has the same waveshape as my
> input wave, i.e. if i try to drive the chip with a
> triangle, the outputs are triangles....
> I guess *all* of my 4029 somehow magically broke at
> one instance... ? 

Check your supply connections. This sounds suspiciously like Vdd or Vss 
are not connected.

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159