MIDIBox CV and AOUT_NG

Testing/Troubleshooting
1

Hi,

After succesfull usage of the AOUT_NG in my SEQ3, I have decided to go and build a MIDIBox CV with the NG. So, I have finally connected the AOUT_NG to my newly built CV box, only to find out I get no CV signal at all.

I am testing ±15V in TL074 as well as 5V in TLV563. I get -1.195 in JP1 and -2.264 in JP2 and so on.

Also, I have ~1.9V in pin 3 of the TLV563.

In addition, resistors R33-R48 get hot while the ±15V is active.

Any clues as to how to further debug this?

Whomper

2

I have made some more checks and it appears as if the TLV5630 does not produce any signal in all its lines.

Might there be damage to the IC?

Whomper

3

well, by some miracle, things suddenly started to work.

Whomper