EnvVCA [ENV]

Analog envelope generator, slew limiter, and VCA

The EnvVCA is a compact analog envelope generator with a built-in low-noise exponential VCA. It's a perfect companion to any VCO, whether you trigger it or self-cycle, and/or use the envelope output to modulate something else. With a wide time range from 30 minutes to 10kHz, it can be used as an LFO, slew limiter, audio or CV VCA, ASR/ADSR envelope generator, audio-rate oscillator, and more.

EnvVCA features:
• Versatile linear envelope generator/LFO
• Low-noise, low-distortion, DC-coupled exponential VCA
• 100% analog
• Sliders, switches and Time CV jack controls Rise and Fall times from 100µs (10kHz) to over 30 minutes
• With sliders and switches only: ~1.25ms to over 2 minutes
• Independent attenuverters for Rise and Fall time
• Blue/red LEDs indicate strength and polarity
• Cycle button for looping envelopes (LFO)
• Trigger input jack fires a one-shot envelope
• Cycle gate input jack toggles cycling
• EOR (End of Rise) gate output can be used to chain and sequence events
• Env Level slider controls output level of the Env jack without changing the VCA volume
• Audio In and Out jacks for passing audio or CV through the VCA
• VCA gain internally connected to envelope output
• Follow input jack allows for slew limiting, sustain (ASR), and exotic filtering effects
• Re-trig jumper allows for re-triggering during rise phase

The EnvVCA is essentially half of a Dual EnvVCA, without the VCA CV jack and Offset knob.

Specifications:
• 8HP Eurorack format module
• 0.95” (24mm) maximum depth (includes power cable)
• 10-pin Eurorack power header

Power consumption
• +12V: 83mA
• -12V: 81mA

Audio/VCA
• 100k input impedance, 1k output impedance, DC-coupled
• VCA gain range: -90dB to +0.9dB
• DC to 20kHz, +/-0.1dB
• VCA response to CV: exponential

Envelope Times
• Minimum rise or fall time: ~50us (10kHz max frequency)
• Maximum rise or fall time: >10 minutes (typically 15-20 minutes per segment)

Jacks:
• Env jack:
when fall time > 11ms: Min = -5mV to +40mV, Max = +9.5V
when fall time < 11ms: Min = -200mV to -5mV, Max = +9.5V
• Trigger jack: rising edge threshold = 2.5V
• Cycle jack: rising edge threshold = 2.5V
• Follow jack: active range = 0V to +5V
• EOR jack: 0V to 5V gate output
• Audio In/Out jacks: -10V to +10V maximum range without clipping

https://4mscompany.com/envvca