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+ mA, V- mA.



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


Skrill: info(at)greenexpo.by

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.




PCB top.


PCB bottom.


Front panel.


Back panel.








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