Erica Synths Multimode VCF Manuale utente

GUIDE TO ASSEMBLY OF ERICA SYNTHS MULTIMODE VCF

If you are reading this, most probably, you are about to build the

Erica Synths DIY Multimode VCF! It’s a multimode filter with a CV

control over cutoff and resonance and simultaneous LP, BP and HP

outputs for serious modular patches. The core of the VCF is highly

stable, custom multimode VCF chip AS3320 (produced in Riga,

btw).

The Multimode VCF kit comes in three versions:

1) Set of 2 PCBs + AS3320 IC + mechanical parts (PCB connectors

and spacer),

2) Set of 2 PCBs + + AS3320 IC + mechanical parts (PCB connectors

and spacer) + panel,

3) Full kit.

FEATURES:

•Simultaneous LP, BP and HP outputs

•CV control over cutoff and resonance

•Cutoff CV attenuverter

•Volume drop compensation, as resonance is increased

•High temperature stability

•Skiff-friendly design

SPECIFICATIONS:

•Audio input amplitude 10Vptp

•CV amplitude (full sweep) -5V - +5V

•Panel width 10HP

•Module depth 35mm

•Power consumption 36mA@+12V, 36mA@-12V

The big knob makes a difference! This is the

filter cutoff frequency control.

Adjust the input signal level with this knob!

This knob adjusts resonance level. The module

has volume drop compensation, so with

increasing resonance, the audio volume will not

reduce

This is the cutoff CV attenuverter

This is the cutoff CV input

This is the resonance CV input

7This is the resonance CV attenuator

8Patch the audio signal here!

9These are the VCF outputs

Take precautions with regard to electrostatic discharge (ESD) safety. Handling components should be done

in an electrostatically safe environment. Use personal and workplace grounding. Any discharge (even a

minor one) from your body to a component may permanently damage it.

Our PCBs have silkscreened both component values and designators nevertheless we highly recommend

you to print out the files with the component placement before you start assembly of the module. And,

please, at least take a look at this manual!

Some components are marked as NU (not used) –leave those unpopulated! Some components are market

as OPTION (those are for optional modifications) –leave those unpopulated for now.

ASSEMBLY

1Solder horizontally placed resistors and diodes on both PCBs (Controls board and Main board)! Pay attention on the

orientation of the diodes! Solder the ferrite beads on the controls board!

2Solder the IC sockets on both boards! Also solder the resettable fuses (if you have rectangular resettable fuses, you

should solder them later on the opposite side of the PCB –they are too high to fit on this side of the board).

GUIDE TO ASSEMBLY OF ERICA SYNTHS MULTIMODE VCF

Controls board

Main board

3Solder the capacitors on both boards!

GUIDE TO ASSEMBLY OF ERICA SYNTHS MULTIMODE VCF

5Solder the electrolytic capacitors on the Main

board! These are non-polarized capacitors, so

polarity doesn’t matter.

Solder, the voltage regulator, the

potentiometers and jacks on the controls

board!

6Turn the controls board around and solder the

electrolytic capacitors, the PSU connector, the board

connectors (female) and resettable fuses (round

ones that come with a kit are ok to fit on the top side

of the board).

8Use the M3x6 screw to attach the spacer to the

Control PCB! Connect both PCBs together and

secure the bottom one with the other M3x6 screw!

For all our modules with 2 PCBs the white stripes on

both PCBs have to match.

7Solder board connectors (male) on the main board!

GUIDE TO ASSEMBLY OF ERICA SYNTHS MULTIMODE VCF

Notice that two

non-polarized

capacitors should

be soldered

horizontally!

Install the front panel and potentiometer knobs!

Congratulations! You have completed the Erica

Synths Multimode VCF module! It does not need

calibration and will work straight away.

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