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Din Sync VCF303 User Manual

Eurorack filter module
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Dear customer,
Thank you for your purchase of the VCF303 eurorack filter module.
The VCF303 is a clone of the Roland TB-303 filter which also includes the envelope generator
and accent circuit of the TB-303 in order to get an authentic sound. It also features CV control
over the cutoff frequency and an overdrive knob for driving the input section.
While I'm sure many of you will be using this to make "acid" style sounds, don't forget to explore
using it as a source of other patch types. I'm sure you'll be pleasantly surprised with the results.
Please take your time to read the installation instructions and to try out the patch examples.
Your module comes with 12 months free technical support for the original purchaser, just drop
an email to
info@dinsync.info
if you have any questions or problems.
Again thank you for your purchase, it's much appreciated. And don't forget to keep an eye on
http://www.dinsync.info
for the forthcoming OSC303MKII which will appear sometime in the very
near future.
Paul
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Summary of Contents for Din Sync VCF303

  • Page 1 Thank you for your purchase of the VCF303 eurorack filter module. The VCF303 is a clone of the Roland TB-303 filter which also includes the envelope generator and accent circuit of the TB-303 in order to get an authentic sound. It also features CV control over the cutoff frequency and an overdrive knob for driving the input section.

  • Page 2: Installation

    I know right? but please at least read the installation and quick start. Installation The VCF303 has reverse power protection, so plugging the power cable in backwards should result in no damage to the module itself. However plugging things in backwards is never a good idea and could potentially damage other parts of your system.

  • Page 3: Quick Start

    Turn the volume to about halfway and adjust the other controls (except overdrive) to taste. You should now be hearing that familiar rubbery liquid filter sound. To get the most from your VCF303 please read the following sections which describe the feature set and their interactions with each other in more detail.

  • Page 4: Filter Section

    Filter Section The CUT OFF FREQ knob adjusts the cutoff point of the filter. Turning the knob to the right allows more high frequency content to pass, resulting in brighter timbres. Turning the knob to the left closes the filter and less high frequency content is passed, resulting in duller timbres.
  • Page 5 Envelope Section The ENV MOD knob controls the amount of signal from the envelope generator that reaches the CUTOFF circuit. As with the TB-303 it is not possible to completely turn off the envelope modulation. If this knob is adjusted without an envelope being triggered it will provide an offset for the cutoff frequency.
  • Page 6 Accent Section The AC TRIG jack controls when an accent is fired. The accent works best when timed in conjunction with the envelope generator. When accents are triggered, the envelope decay is cut short (ie the decay pot no longer works).
  • Page 7 NOTE: The accent output jack may need attenuation or boosting depending on the vca used. If you have a vca with only one input you can use a dc coupled mixer to combine your accent output with your adsr before it reaches the vca. See the patch sections for an example of how to set this up.
  • Page 8 TB-303 The VOLUME knob controls the overall output. The VCF303 has a fixed output level and this knob is simply an attenuator. NOTE: With a strong signal at the filter input, and with...

  • Page 9: Patch Examples

    ADSR output to DC coupled mixer in and connect mixer output to vca cv in) Connect VCF303 ACcent out to vca cv in 2 (if you only have a single cv input on your VCA then connect VCF303 ACcent output to DC coupled mixer in) Depending on the sensitivity of your vca you may wish to place an attenuator or gain amplifier between the VCF303 ACcent out and vca.
  • Page 10 Additional modules needed, Manhattan Analog CVP (or equivalent offset generator) The VCF303 range is limited to the same as the TB-303. In other words it is not possible to completely close the filter. If you want to get an extended Cutoff range connect the CVP output to the VCF303 CV in.

  • Page 11: Adjustment Procedure

    Adjustment Procedure Please read all of this section before attempting to adjust the modules internal trimmers, failure to do so may kill many tiny animals but could also potentially kill your module. This section is intended for those with the necessary skills and experience with calibration adjustments.
  • Page 12 To adjust the center frequency of the cutoff. First turn all front panel controls to 0% and set cutoff to 50%, resonance to 100% and volume to 50%. Connect a saw waveform (preferably an OSC303) tuned to 110hz to VCF303 INPUT Connect a trigger to ENV TRIG Connect an oscilloscope to VCF303 OUTPUT While triggering the envelope adjust TM3 to read between 1.8 and 2.0 ms on the first pair of...

  • Page 13: Specifications

    Acknowledgements many thanks go out to Stephen Kwartler from http://www.pro-modular.com for the panel design. Chris “Infradead” Lehfeldt for beta testing. Additional thanks to Tony at Makenoise and Jason at Manhattan Analog for their permission to use their module names in the patch section of this manual. Specifications Size: 12 HP Depth: 38 mm (depth is measured from the rear of the faceplate to the edge of the supplied and...

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