Driving a headphone with the A-138 cannot destroy the module as there is a
protection resistor in the output line. But the audio level will be very
poor unless you use high impedance head phones (>1kOhm).

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von untiedstates
> Gesendet: Sonntag, 8. Oktober 2006 23:12
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 Re: A138 mixer distortion issue
>
>
> Hi Tim,
>
> Thanks for the input... unfortunately I had asked on this very group
> about using headphones before and got a response from someone else
> that they used headphones directly from the Doepfer all the time and
> it worked great...
>
> Well, no crying over spilt milk from me.. but the fact is that it is
> blown and I'm just replacing it with a polarizing mixer because I like
> those much better in the end.
>
> I'll fix this one eventually, though.. just no more "convenient"
> headphone monitoring :(
>
> best,
> Bryan
>
> --- In Doepfer_a100@yahoogroups.com , "Tim Stinchcombe" <timothy@...>
> wrote:
> >
> > Hi Bryan,
> >
> > > A couple things: I've been using headphones with the mixer,
> >
> > My guess is that this is what has probably caused the problem - almost
> > certainly it is not designed to drive such a load, and I suspect the
> > chip would run pretty hot if you did so, and it has probably just given
> > up the ghost. If you have any soldering skills, it would be quite
> > simple to replace the chip to find out, and much cheaper than a new
> > module!
> >
> > Tim
> >
>
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> Yahoo! Groups Links
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