Black Quad VCA - Synthesizer Erica Synths - Free user manual and instructions
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| Product Type | Eurorack Synthesizer Module |
| Brand & Model | Erica Synths Black Quad VCA |
| Module Width | 14 HP |
| Depth | 25 mm |
| Weight | Approx. 120 g |
| Power Requirements | +12V: 50mA / -12V: 50mA |
| Number of Channels | 4 independent VCA channels |
| VCA Response | Switchable linear / exponential |
| Manual Gain Control | Dedicated potentiometer per channel |
| CV Inputs | 4 × control voltage inputs (0–5 V) |
| Audio Inputs | 4 × mono audio inputs |
| Audio Outputs | 4 × mono audio outputs |
| Maximum Output Level | 10 Vpp (with overdrive) |
| Signal-to-Noise Ratio | > 80 dB |
| Overdrive Circuit | Soft saturation for warmth |
| Protection | Reverse polarity protection |
| Included Accessories | Power cable, mounting screws |
| Material | Black anodised aluminium faceplate |
| Maintenance | Clean with soft dry cloth; avoid solvents |
| Safety | Disconnect power before installation |
| Repair & Spare Parts | Modular design; individual components replaceable |
Frequently Asked Questions - Black Quad VCA Erica Synths
How do I install the Black Quad VCA in my Eurorack case?
Turn off your case's power. Attach the included power cable to the module's power header, ensuring the red stripe matches the -12V rail. Screw the module into the rack rails, then power on.
What is the difference between linear and exponential VCA response?
Linear response gives a directly proportional amplitude change, while exponential response mimics natural volume curves with a more dramatic taper, often preferred for audio and envelope shaping.
Can I use control voltages higher than 5 V on the CV inputs?
The CV inputs tolerate 0–5 V signals with overvoltage protection. Higher voltages (up to 12 V) are clamped, but sustained over-voltage may reduce dynamic range or cause distortion.
What is the power consumption of the module?
The module draws approximately 50 mA from both +12V and -12V rails. This is modest, but always calculate total load on your case's power supply.
Can the Black Quad VCA process both audio and CV signals?
Yes, each channel acts as a linear VCA for audio or CV. At audio rates it amplifies sound; for CV, use linear mode to maintain precise pitch or control voltages.
What happens if I patch an audio signal into the CV input?
The VCA will modulate the output at the audio rate, creating ring-mod like timbres due to the multiplication of the two signals. This can be a happy accident for experimental patches.
Does the module require any calibration?
No calibration is needed. The VCA is factory-calibrated for unity gain at maximum settings. If you notice imbalance between channels, check your patch and attenuator settings first.
Can I daisy-chain the outputs of the four channels?
You can mix them externally, but do not directly parallel the outputs. Use an external passive mixer or send each channel to a dedicated input on your mixer or interface.
How should I clean and maintain the module?
Use a soft, dry microfiber cloth to wipe the faceplate and knobs. Do not use liquid cleaners or compressed air near the jacks. Regular dust removal keeps the potentiometers behaving smoothly.
Is the Black Quad VCA repairable if a component fails?
The module uses through-hole components, making it serviceable by qualified technicians. Contact Erica Synths for spare parts or repair advice. Warranty covers manufacturing defects.
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USER MANUAL Black Quad VCA Erica Synths
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Product information
Brand : Erica Synths
Model : Black Quad VCA
Category : Synthesizer