Quote:
Originally Posted by DonaldStott
O.k. all wired up and double/triple checked my connections.
Something not quite right as I'm getting 8.5 - 8.6kHz on the Output from Pin 4 (2Y) of the CD4081 (actually a CD4081BE but I'm assuming the Pins are the same?)
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Re the 'BE' suffix:
A plain CD4081 is 'unbuffered'.
'B' simply means the IC has a buffered output. The pinouts are identical.
A 'buffered' CMOS device is one for which the output ON impedance is independent of any and all valid input logic conditions, both preceding and present. (I'm told!).
'E' means 'plastic encapsulated dual in-line package'.
An fuller explanation of buffered and unbuffered CMOS can be found here:
http://www.ti.com/lit/an/scha004/scha004.pdf
Hope that helps, albeit it doesn't answer they key questions.