Since you guys have an ASR up and running, perhaps you could help me
with a question of my own. Are you getting slight shifts at the
outputs. I posted an example and a text file under the Files section
of the group. Also, do the SH opamps get kinda hot? How about the TL074?
I get shifts with every clock pulse. It's still a useful module even
with this feedthrough (offsets), but I'd like to know what other
people are experiencing. Perhaps there will always be some
feedthrough????????????
I've tried all the mods I've read for the ASR with little to no
change. I'm trying yet another brand of polystyrene caps before I give
up.
I'm wondering if ANYONE has an ASR that doesn't shift the outputs
slightly in time with the clock.
Please, someone...anyone, can you check the sample in the files
section under "asr question".
I'm not asking for an indepth circuit fix, just a simple: "yes, mine
does that, too" or a "No, something is wrong". This would help
enormously!!!!!!!!!!!!!!!!!!!!!
Thanks,
peng
with a question of my own. Are you getting slight shifts at the
outputs. I posted an example and a text file under the Files section
of the group. Also, do the SH opamps get kinda hot? How about the TL074?
I get shifts with every clock pulse. It's still a useful module even
with this feedthrough (offsets), but I'd like to know what other
people are experiencing. Perhaps there will always be some
feedthrough????????????
I've tried all the mods I've read for the ASR with little to no
change. I'm trying yet another brand of polystyrene caps before I give
up.
I'm wondering if ANYONE has an ASR that doesn't shift the outputs
slightly in time with the clock.
Please, someone...anyone, can you check the sample in the files
section under "asr question".
I'm not asking for an indepth circuit fix, just a simple: "yes, mine
does that, too" or a "No, something is wrong". This would help
enormously!!!!!!!!!!!!!!!!!!!!!
Thanks,
peng
--- In cgs_synth@yahoogroups.com, Jason Proctor <jason@...> wrote:
>
> i did exactly the same thing and experienced the situation you're
> seeing. the problem is that the 4024 triggers on the falling edge
> (yuck) rather than the rising edge, so the incoming clock has to be
> inverted before going to the chip, and since you took your feed off
> the 4024, you're seeing the inverted clock. hence the LED will be lit
> all the time, blinking off briefly when the clock happens.
>
> my "fix", rightly or wrongly, was to take the clock from after the
> 15k resistor before it goes into the comparator opamp. worked for me,
> though the LED isn't that bright...
>
> hth
> j
>
>
>
> >hi,
> >
> >I've build an ASR with an LED linked to the clock input... at the
> >moment it simply lights up relative to the voltage presented to this
> >input. What I'd really like would be if it flashed quickly whenever
> >the shift register actually changed state - if I attached the CGS LED
> >driver to pin 1 of the ASR's 4024 might I be able to achieve this
> >effect? Or would I need some extra circuitry?
> >
> >Thanks,
> >t
> >
>
>
> --
> Jase is doing the AIDS ride next year - to sponsor him visit
> http://www.aidslifecycle.org/1674
>