More of those ASR questions...
2008-01-14 by kopernig
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.
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.