I know fudged modern day plug-in 2 IC equivalents are available but I'd like
to make my own.

Its a frequency divider , 7 stages , broken into a few isolated stages but
in this use they are chained together so 1 4024 would do and perhaps 1 +
1/6 4049 for buffering.
The trouble is the original uses 2 supplies -15V for outputs buffer supply
and -27V for the logic.
Anyone been here before ?, resistive divider/15V zener ? on the input and
running the CMOS 'upside down' between 0 and -15V ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

n cook wrote in message
...
I know fudged modern day plug-in 2 IC equivalents are available but I'd
like
to make my own.

Its a frequency divider , 7 stages , broken into a few isolated stages but
in this use they are chained together so 1 4024 would do and perhaps 1 +
1/6 4049 for buffering.
The trouble is the original uses 2 supplies -15V for outputs buffer supply
and -27V for the logic.
Anyone been here before ?, resistive divider/15V zener ? on the input and
running the CMOS 'upside down' between 0 and -15V ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



No, presumably just a gating trannie at the input as a level shifter is all
that's required