SSM2044 calibration questions

Testing/Troubleshooting
21

Yes!

I got some oscillation!!! I didn’t expect the callibration to be that tricky, guess I was impatient.

Thanks for all your help Imp! :flowers:

22

no problem, now go make some xox-owners jealous with it :wink:

23

Yes!

I got some oscillation!!! I didn’t expect the callibration to be that tricky, guess I was impatient.

Thanks for all your help Imp! :flowers:

Strophlex: If you have time would you mind listing the steps that led to successful oscillation? I need to get my 4 filters working properly so I can make music with them…

cheers,

grizz

24

I adjusted P3 to get 1.43 k ohm between pin 3 of LM13700 and gnd.

I adjusted P4 to get 1.43 k ohm between pin 14 of LM13700 and gnd.

Then I adjuseted P1 to get 26.8 k ohm between pin 1 and pin 11 of LM13700. That meant turning it all the way counterclockwise.

Then I adjuseted P2 to get 26.8 k ohm between pin 16 and pin 11 of LM13700. That meant turning it all the way counterclockwise.

I adusted P3 and P4 a bit more to get a bit more resonace, ended up at 1.46 k ohm I think.

Now my relays start to die off…

EDIT: It seems like it is my crimpings that die off. Hope the relays are OK.

25

I adjusted P3 to get 1.43 k ohm between pin 3 of LM13700 and gnd.

I adjusted P4 to get 1.43 k ohm between pin 14 of LM13700 and gnd.

Then I adjuseted P1 to get 26.8 k ohm between pin 1 and pin 11 of LM13700. That meant turning it all the way counterclockwise.

Then I adjuseted P2 to get 26.8 k ohm between pin 16 and pin 11 of LM13700. That meant turning it all the way counterclockwise.

I adusted P3 and P4 a bit more to get a bit more resonace, ended up at 1.46 k ohm I think.

Now my relays start to die off…

EDIT: It seems like it is my crimpings that die off. Hope the relays are OK.

After a long time working on other projects I finally replicated your readings, and… OSCILLATION!!! Thanks for all the help… damn they sound so smooth!

cheers,

grizz

26

After a long time working on other projects I finally replicated your readings, and… OSCILLATION!!! Thanks for all the help… damn they sound so smooth!

cheers,

grizz

Great! I just went back to this myself. Soon to be completed.