i have a “little” doubt about the digital out connection
especially the modulation matrix ports
i tested the connection with a led and it lits only with the short leg on the left side
i mean short leg in j5-d0 and long leg j6-d1
is it normal?
with the other ports the anodes cathodes are in the right position
there is anybody here able to explain this?
Hi,
the firmware controls this particular LED in the following way:
(1) LFO6->Filter off: J5:D0=0V and J6:D1=0V (LED off because both pins are at the same level)
(2) LFO6->Filter on: J5:D0=5V and J6:D1=0V (LED on because of right direction -> anode connected to J5:D0)
But: all LED lines are time multiplexed. J6:D1 is only 0V for a short moment, in 6/7 of the multiplex cycle J6:D1 is held to 5V
This means: so long the LED line is not selected, we have:
(3) LFO6->Filter off: J5:D0=0V and J6:D1=5V (LED off because of wrong polarity)
(4) LFO6->Filter on: J5:D0=5V and J6:D1=5V (LED off because of same level at both pins)
If you connect the LED in the wrong direction (cathode connected to J5:D0), it will light in 6/7 of the update period because of case (3).
You can doublecheck this by turning on the modulation for LFO6->Filter in the MOD menu - the LED should turn off. If you’ve connected the LED in the right direction, it should turn on.
Hope that this answers your question…
Best Regards, Thorsten.