YaVCF: MS20-inspired resonant VCF (6HP - partial build)

NEW BOARD RUN DUE AT THE END OF DECEMBER ....

This is a PCB/panel set for the YaVCF filter module.

All surface-mount components have been pre-soldered - it is up to you to provide the necessary through-hole componentry to complete the build. These are updated boards which have been fabricated by a PCB assembly service - the hand-built modules are now sold out.

The following will be required:

• 4x PJ301M(-12) jacks (aka. THONKICONN)
• 2x red LEDs (D1, D2) for the feedback section - the square pad is the LED cathode.
• 2x 2N3906 PNP transistors (Q1, Q2) - matched pairs aren't necessary. You can use any suitable PNP transistor, but 3906s are probably the easiest to get.
• 3x 1nF film capacitors (C2, C5, C8) - you could use ceramic caps but it will likely change the character of the filter. I tend to use Mylar capacitors on pre-built modules - you can use polypropylene if you want to go for full overkill.
• 1x 220nF film capacitor (C1) - same caveats as above. This is a DC-blocking capacitor.
• 2x 10uF electrolytic capacitors (C9, C11) - note the polarity!
• 3x Alpha RK097 (or equivalent) pots - 100k linear taper recommended.
• 2x5 IDC header - the white line on the silkscreen aligns with the -12V line.

Whatever you do, solder up the power connector before you solder the jacks in place, otherwise it will be almost impossible to solder the power connector without damaging the bodies of the jacks. Other than this, components can be fitted in any order.

US CUSTOMERS PLEASE NOTE: since no additional assembly is done, the country of origin of these boards is China. Complete modules will have the COO listed as the United Kingdom as I do all the necessary assembly and testing prior to shipping.