Cgs synth

>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
>

--- 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
>

> 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
>
>