Discussion about the Korg PolySix synthesizer

I changed to current limiting resistor from 470R to 2.2k. If I'm not wrong
this should result in less than 1.5mA current drawn by the LED.
I'm under the impression that this modification has improved the
arpeggiator pulse problem but it still hasn't completely fixed it (and the
other instabilities as well). I can still make the strobe tuner "move" by
turning arpeggio speed fully up and make it "stop" again by turning
arpeggio speed way down. But the deviation seems to have gotten smaller.

So far I've tried four Polysixes with five different mainboards (2
original, 3 clones) and all have shown those symptoms to some degree.

So, before I'm starting to chase a phantom: Can anyone else reproduce this
(the very slight pulsing or pitch increase from the arpeggio speed and the
pitch increase from the "Hold" button LED)? Perhaps also slight irregular
pitch deviations when holding a single note?

Shall I record a note with those problems?





> Am 03.07.2016 um 14:40 schrieb Malte Rogacki gacki@gacki.sax.de [PolySix]
><PolySix@yahoogroups.com>:
>
> So I tried to use low-power LEDs. This seems to have very little effect.

Did you just replace the LEDs or did you also change the series resistors?
Just replacing the LEDs and leaving the series resistor as they were won't
change the current consumption.

Ingo




-- 
Malte Rogacki gacki@gacki.sax.de 
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"Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you
 get no sound out of it." (ARP 2600 Owner's Manual)
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