3340 VCO - 1V/Octave Calibration

Before you begin, set the Tune and Fine Tune knobs to the middle position (V2.7 or later versions). Also, turn the Hi Frequency Tune trimmer all the way down, ensuring that the middle pin shorts with ground when fully lowered.
1- Connect a voltage-generator (VC) source, such as a keyboard, to the 1V/octave input of the VCO.
2 - Play note C2 (2 volts) on the keyboard. Use the Tune and Fine Tune knobs on the VCO to tune it to C2.
3 - Press C3 (3 volts) on the keyboard. Adjust the scale trimmer on the VCO to tune it to C3.
4 - Return to C2 and ensure it is still accurately tuned using the Tune and Fine Tune knobs.
5 - Press C3 again and fine-tune it using the scale trimmer on the back.
6 - Repeat the process with C2 and C4, ensuring accurate tuning with coarse and fine adjustments.
7 - Check the upper octaves for fine-tuning using the scale trimmer.
8 - Press C9 (9 volts) on the keyboard and adjust the Hi Frequency trimmer to tune the VCO to C9.
By following these steps, you should be able to properly tune your VCO across multiple octaves for accurate pitch reproduction.
If you are interested in buying this PCB and Front Panel kit follow this link:
gurugarasynth....
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[@Gerrysynth]

Have just finished putting this module together and calibrating it as per instructions, it works flawless through the octave range from C1 - C8 i couldn't hear C9 lol.
I measured every component in the build to get nearly spot on tolerances in relation to the schematic.
It works really well. Great design. 😁👍👌

[@GuruGaraSynth]

That's fantastic news! I'm glad to hear that you've successfully assembled and calibrated the module. It's always rewarding to see our designs come to life and perform as intended. Thanks for taking the time to share your experience. Your feedback is invaluable.