Quad VC Equalizer ttt





Quad Voltage Controlled Resonant Equalizer.



  • Four parametric equalizers with full voltage control connected in series.
  • Individual output of previous channel is connected to switched pin of next channel input jack.
  • Switchable to low-shelf on first channel, and to hi-shelf on fourth channel.
  • Switchable to selfoscillation mode via DIP-switches. For v/oct trimming.
  • Bipolar level control. +-16dB, CV range +-5V.
  • Bandwidth control 0.8...24 semitones. CV range +-5V.
  • Frequency control 10 octaves. CV range 0...10V.
  • Power consumption: V+ 193mA, V- 193mA.



Two PCBs - 2mm thickness, gold platted, black mask. $70

Two panels - 24HP front & back. Anodized alu, black print. $45

SMD parts + soldering. $30

8 tempco resistors $10

standoffs, connectors.

Shipping per set: $5 - only boards, $10 - boards+panels.


TOTAL for complete set with shipping: $165


Paypal: info(at)greenexpo.by


Assembled module $680 + $20 shipping.


MUFFWIGGLER forum thread https://www.muffwiggler.com/forum/viewtopic.php?t=136577






Partslist PCB1.


Partslist PCB2.








Parts not included in Mouser shopping carts:


12 potentiometers
12 knobs


Where to buy?


1. Thonk:
pots: http://www.thonk.co.uk/shop/alpha-9mm-pots/
knobs: http://www.thonk.co.uk/shop/synth-pointer-knobs/


2. Erthenvar:
pots: http://erthenvar.com/store/accessories/pots/9mm-vertical-pots


3. Smallbear:
pots: http://smallbear-electronics.mybigcommerce.com/alpha-single-gang-9mm-right-angle-pc-mount/
knobs: http://smallbear-electronics.mybigcommerce.com/synth-pointer-2-colors/


4. Tayda:
pots: http://www.taydaelectronics.com/potentiometer-variable-resistors/rotary-potentiometer/linear/50k-ohm-linear-taper-potentiometer-round-shaft-pcb-9mm.html




1. Thonk: http://www.thonk.co.uk/shop/thonkiconn-3-5mm-jack-sockets-x50/


2. Erthenvar: http://erthenvar.myshopify.com/products/3-5mm-inline-jacks



THAT chips on Etsy:













Frequency CV 0..10V in steps 1V



Level CV 0...5V in steps 0.5V



Level CV 0...-5V in steps -0.5V



Bandwidth CV -5...5V in steps 1V. Boost.



Bandwidth CV -5...5V in steps 1V. Cut.



Frequency temperature drift 25, 50, 75 C. Regular resistors (no tempco).



With tempco:



Low shelf boost. Bandwidth CV -5...5V in steps 1V.



Low shelf cut. Bandwidth CV -5...5V in steps 1V.



High shelf boost. Bandwidth CV -5...5V in steps 1V.



High shelf cut. Bandwidth CV -5...5V in steps 1V.






(c) 2015 L-1 Synhesizer. E-mail: info@greenexpo.by