AOUT LC with SEQ

Testing/Troubleshooting
1

I’ve built a AOUT LC, activated it in the SW, but I only get 0 to +/-5V out.

I’m using a +/-15V PSU (Old MOTM PSU)

Resistor values are OK…

I didn’t bother to match the 10K resistors for this one.

And now that I’m asking questions, my MIDI out ports 1 & 2 give the same output. I mean, when selecting midi out 1, I also see the led of midi out 2 blinking. Midi out 2 is “available”. I must admit I didn’t install the 1K (or was it 10k) resistors connected to 5V at the selection pins.

Any ideas?

Cheers,

Tom

2

Hi Tom,

which voltage do you measure on the positive inputs of the OP amp, is it between 0V and 5V (depending on note or CC value?)

IIC modules: the resistors are required so long the pins are not directly tied to Vs or Vd in order to ensure a stable logic level. Otherwise random things can happen (like you’ve probably noticed)

Best Regards, Thorsten.