Doepfer

So the A-126 seems to be very old as we use sockets for integrated circuits
since nearly 20 years because it simplifies the service in case of a faulty
integrated circuit clearly.
Let's hope that the mentioned interruption is the only problem (apart from
re-adjustment).
The planned new frequency shifter module will be equipped with a squelch
circuit (combination of envelope follower and VCA) that can be used to avoid
the bleeding of the multipliers. But with optimal adjustment the bleed of
the old A-126  should be better than about -50dB. So far the new FS is still
in the development state and I have no release date available. It's a very
special module which I do mainly for myself and I don't expect large sales.

Best wishes
Dieter Doepfer


> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> Gesendet: Freitag, 22. Februar 2019 01:44
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] Re: A-126 Malfunction
>
>
> Forgot to say that I do not have an oscilloscope to measure the circuit.
> I do not hope the CEM3382 is broken, for it is hard to find.
>
> And if the correct adjustment is very important, I will try to do
> that first. The adjustment I ever have made, is to reduce the
> sine bleeding with four of those trimmers. Maybe I did something
> wrong then.
>
> But today I scratched with a wooden stick all over the solder
> part, while the module was playing and discover a loose solder
> part. It was pin 7 from IC2/TL064 close to the Audio Input. That
> pin is connected with R15.
> Fixing the connection only result in a louder sound.
>
> Since my A126 has mostly ic's without a socket, it will take much
> time to replace them. But it is worthwhile. And I think it is
> always good to replace old components, for they say that they do
> not perform optimal anymore.
> On the other hand, I always hated the bleeding sine of this
> module. If the upcoming new Freq Shifter has no bleeding I'll
> have one. Because a FS is special, it is very funny.