Doepfer

Hello group,
    I've got this A-111 I got used via AH some months ago.  it works  
according to what I'd expect except that the range switch has an  
anomaly.  Set all the way counterclockwise, it puts out at LFO  
frequencies, but for the top two positions it reverts back to LFO. It  
has ten positions also, not eight.  At the high end, nothing above  
maybe 8000 cps is available.  And in the low end, it doesn't go all  
the way down to less than 1 cps like other oscillators, but maybe to  
five or six cps only.   Can anybody diagnose this?

David Westling

Hi David,

>     I've got this A-111 I got used via AH some months ago.  it works  
> according to what I'd expect except that the range switch has an  
> anomaly.  Set all the way counterclockwise, it puts out at LFO  
> frequencies, but for the top two positions it reverts back to LFO. 
It  
> has ten positions also, not eight.

That sounds normal: only 8 of the ten 10 positions are used, and 
because of the type of switch used (it is a 'binary coded decimal' 
one), when you turn it past position 8, it 'wraps around' giving the 
lower two settings again for 9 and 10.

  At the high end, nothing above  
> maybe 8000 cps is available.  And in the low end, it doesn't go all  
> the way down to less than 1 cps like other oscillators, but maybe to  
> five or six cps only.

In normal adjustment, the '-3' setting should give approx 8Hz with 0V 
CV in, and the '4' position will then be 1046Hz, at 0V in. At '4', if 
you input 5V, it should be good for 33kHz or so, and maybe more for 
more volts in. If you are not getting this, then the irst step would be 
to try and re-calibrate the module, which most likely you will need to 
ask Dieter for!

Tim