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.
the envvca is essentially half of a dual envvca, without the vca cv jack and offset knob.
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
specifications:
hp 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
