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analog shift register

analog shift register

2008-11-14 by eyjolv

Hi.
I just built the ASR. The first module I try to build myself.
Unfortunately it is not working as it should. I hope someone will have
an idea what is wrong, as I don't know enough about electronics to
debug this.

Here is what is happening when I route the outputs to oscillators:

1 - At one of the stages the oscillator glides slowly in pitch up to
above audio, maybe settling on 10v or something. This happens on all
outputs. The other three stages function ok. However...

2 - On the other three stages the pitch is about 2 semitones higher
than input (getting slightly more flat on high notes).

3 - In addition to problem 1 and 2: out1 gives the same as input, out2
is shifted one step, out3 is shifted two steps (i think this is wrong?)

Re: analog shift register

2008-11-27 by eyjolv

I guess it is most likely that the problem is caused by a damaged PCB.
I started out with a bad soldering iron, and think I can have
destroyed the PCB by burning it. Well that was a way to practice
soldering. Maybe I will try again with a new PCB.

The offset error on the outputs is probably a common problem with the
ASR.
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, "eyjolv" <karsteindjupdal@...> wrote:
>
> Hi.
> I just built the ASR. The first module I try to build myself.
> Unfortunately it is not working as it should. I hope someone will have
> an idea what is wrong, as I don't know enough about electronics to
> debug this.
>
> Here is what is happening when I route the outputs to oscillators:
>
> 1 - At one of the stages the oscillator glides slowly in pitch up to
> above audio, maybe settling on 10v or something. This happens on all
> outputs. The other three stages function ok. However...
>
> 2 - On the other three stages the pitch is about 2 semitones higher
> than input (getting slightly more flat on high notes).
>
> 3 - In addition to problem 1 and 2: out1 gives the same as input, out2
> is shifted one step, out3 is shifted two steps (i think this is wrong?)
>

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