The offset can be nulled out by adjusting the offset resistor in that output
stage. Go to larger, better caps to deal with the droop.
Ken
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
stage. Go to larger, better caps to deal with the droop.
Ken
>Just built an analog shift Register, and it seems to have a few of the_______________________________________________________________________
>same problems as other people's... In a nutshell, the output at 1 is
>*about* 10mV higher (enough to cause a very noticeable audio
>difference) than the input voltage (but fairly stable), the outputs at
>2 and 3 are *roughly* 14-20 mV higher and have that 'droop' that
>people mention; slow drop in voltage until the next clock pulse. I've
>matched the resistors as best I could, added the resistor between the
>4053 and 074, and put small caps (22 or 47pF) across the 074 inputs,
>as has been suggested. Should I just bite the bullet and invest in
>some quality capacitors for Cx? I sort of skimped on them, they were
>basically the first four that came to hand... (I think they're
>polystyrene, 47n)
>Any help appreciated,
>Andrew.
>
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
>
>
>
>
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>