[Build] Dannysound - Cali Oscillator (258 clone)

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

Moderators: Kent, Joe., analogdigital, infradead, lisa, parasitk, plord, sduck

dannysound
Learning to Wiggle
Posts: 31
Joined: Wed Jul 04, 2018 10:31 am
Location: Berlin

Post by dannysound » Sun Nov 24, 2019 10:47 am

Waz
V/oct works from 0V to 10V. Middle C on most keyboards with 88 notes is 5V. You can use the master tune trimpot to set the Oscillator to middle C when the coarse and fine tune controls point to 12 o’clock or whatever position you prefer. Ensure the LFO switch is out!

The master tune trimpot also functions to tune multiple Cali Oscillators to each other if you’re playing polyphonicly.

With nothing plugged into the v/oct input it is normalled to around 4V via a switch in the socket. If you’re running v/oct in a lower range say 0V to 5V you can plug the v/oct out from you’re Controller to the log input of the Cali and turn the control up full. That should give you better range from the frequency controls.

The quickest way to tune v/oct trimpot is to play an arpeggio over 3 octaves then tune it by ear. If you can’t get it tune then send us an email.

User avatar
Waz
Wiggling with Scurvy
Posts: 2745
Joined: Mon Mar 02, 2009 1:36 pm
Location: Detroit

Post by Waz » Mon Nov 25, 2019 9:26 pm

If I set both tuning pots to 12 oclock, tune the module to middle c via the trim, I am unable to follow the 1vo tuning procedure. My module can't go down to C2? Am I setting pitch with a dummy cable in 1v/o?

Also there is some erratic behavior with module, Only when I am handling it, sometimes it knocks out of tune and "wobbles" pitch until I physically tap the module then it goes back into tune. I checked all of the solder joints under a microscope and nothing was fishy there. Is this the nature of the tempco and those 2 transistors? It only happens when I am holding the module.

Thank you for your help.
Last edited by Waz on Mon Nov 25, 2019 10:10 pm, edited 1 time in total.

User avatar
Waz
Wiggling with Scurvy
Posts: 2745
Joined: Mon Mar 02, 2009 1:36 pm
Location: Detroit

Post by Waz » Mon Nov 25, 2019 10:09 pm

I think i got it...I think?

However, it seems like something is off. I set the pitch controls to noon, then I took 5v from Ornaments and Crime, plugged it into the 1vo and tuned the oscillator to middle c from the trim. Then I followed the calibration procedure. Everything kinda locked into tune and it sounds great. I have one small issue tho. The coarse frequency ranges from LFO territory to around D5 as a max frequency.

If this doesn't sound right, I might have to take you up on the email.

*edit
I didn't get it. I need some guidance on how to do this.

User avatar
devinw1
Super Deluxe Wiggler
Posts: 1079
Joined: Tue Aug 07, 2018 11:20 am
Location: Portland, OR
Contact:

Post by devinw1 » Tue Nov 26, 2019 1:49 am

When you have the LFO switch on or off?

User avatar
Waz
Wiggling with Scurvy
Posts: 2745
Joined: Mon Mar 02, 2009 1:36 pm
Location: Detroit

Post by Waz » Tue Nov 26, 2019 8:52 am

devinw1 wrote:When you have the LFO switch on or off?
Off. When it's on the module is a super slow LFO.

User avatar
devinw1
Super Deluxe Wiggler
Posts: 1079
Joined: Tue Aug 07, 2018 11:20 am
Location: Portland, OR
Contact:

Post by devinw1 » Tue Nov 26, 2019 12:45 pm

Hmm that does seem off. And no CV source is plugged in?

four_corners
Learning to Wiggle
Posts: 39
Joined: Thu Feb 22, 2018 10:56 am

Post by four_corners » Wed Dec 04, 2019 4:49 pm

Just finished my build, and seems like it partially works but I can tell some off things are happening...

First, should the SINE_SHAPE trimpot change the pitch at all while turning? When I turn it, it does seems to go between a triangle and a sine wave, but also the pitch is changing some, is that normal?

Secondly, the O/P_LVL trimmer doesn't seem to do much of anything on mine. I'm assuming this should be changing the output level globally? I'm getting about 3V peak to peak with the switch both up and down on the main output, and exactly 10V from the PWM output. These values don't change while turning the O/P_LVL trimmer.

Lastly, I must have some sort of grounding issue, because when the switch is at the middle setting, everything seems to go a bit bonkers. The signal usually drops out, and touching the front panel I can hear obvious grounding on/off sounds. Any specific area I should check if this only seems to be happening with the switch at the middle position?

Thanks for the help!


EDIT:
I actually think it may not be as messed up as I originally thought after watching DivKids video and after super super carefully calibrating via listening and an oscilloscope.

I'm able to find the "pure" sine wave tone, as well as the point where the WS_trim starts to distort. At this point, the oscillator seems to almost work well, but if I use the waveshaper knob on the front, it only will shape/fold about half way from a sine wave to either the square or saw shape. At fully clockwise, the shape looks about half way to what DivKid gets, so about 50% on his video. I thought maybe I had too small of a value pot there, maybe 10k instead of the 100k needed, but that isn't the case. I'll go through and check all my resistors. Are there specific ones I should look around first before just checking every single one? Thanks!

EDIT #2:

Fixed! Turns out it was the 220p cap next to the O/P_LVL trimmer. Turns out, there was a 2.2nf cap inside the same bag as all my 220p caps, and I magically picked that one out of the bag. So the lesson is, check the actual marking even if you have a bag labelled a specific value.

Post Reply

Return to “Music Tech DIY”