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AW: [Doepfer_a100] Dark Time low gate out signal

2013-09-24 by yahoo@doepfer.de

> Hi group,
>
>
> Dark TIme has this strange behaviour: the gate out signal seems
> low, sending around only 2 to 3V (probably 2,5V but my measuring
> tool is not accurate) when it should be sending 5V and around 5V
> when it should be sending 12V (jumper in the 12V position).
> Would anyone have any idea what could cause this ?
>
>
> Also, I noticed that in the "Update DT firmware" PDF page 2 first
> picture, 1 of the 2 jumpers circled in red (the one at the right
> ) is not in the same position as the one in my DT. The one in my
> DT is directly perpendicular to the left side of the other
> instead of being parallel to its right side.
> Should I correct this or this has nothing to do with the first
> issue and is not source of any other issue ?
>
>
> Thanks for your advices,
> Cheers,
> Phil

I cannot imagine that the Dark Time outputs only 2-3V Gate level. It
probably has to do with your measuring method. If you use a normal voltmeter
(e.g. a multimeter) you measure the average value of the high states (e.g.
+5V) and low states (0V) of the gate signal. If the pulsewidth is 50% you
will measure about 2.5V with your voltmeter. To measure the level of the
high state of the gate signal an oscilloscope is required. But you may
obtain a better result even with a simple voltmeter if you increase the
pulsewidth to the max. setting. Then you should read a value close to +5V
with your voltmeter (or +12V with the gate level jumper in the +12V
position).

Concerning you question about the update document I ask you to address this
question to our Dark Time specialist Christian Assall (software@doepfer.de).
But he is still on holiday until next week.

Best wishes
Dieter Doepfer

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