ANODES / CATHODES INVERTED?

[tokyomatik]

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?

[TK.]

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.