ADSR:LPG Card Playdate

video upload by Todd Barton

"My first day with the new Portabellabz ADSR/LPG Card. Just trying out a bunch of different things as I begin to learn it. Thought I'd share these impromptu explorations. When released they can be ordered here: https://www.portabellabz.be
My Patreon: https://www.patreon.com/synthtodd"

via Mod Wiggler

"The card features a versatile analogue VC looping ADSR (AS3310 based), a preamp, a LPG and an output mixer.

It's an ideal companion for the VCS3 Card or Triglav's Radio Receiver one to add a full 3rd voice.

ADSR

LED : monitors the ADSR output

Pots
Attack : sets the attack time
Decay : sets the decay time
Sustain : sets the sustain amplitude
Release : sets the release time

Black banana CV inputs
Attack : controls the attack time (attenuator trimmer easily accessible next to the pot)
Decay : controls the decay time
Sustain : controls either the sustain amplitude or the pulse length (see below), selected with a mini slide switch
Release : controls the release time


Trigger source
Red banana : pulse input
Length pot : sets the input pulse length - I don't think this is a common feature on standard ADSR, it is to adapt the pulse length for best response to various trigger and gate sources or to create variations in a sequence, it can be voltage contolled via the sustain black banana
Seq / puls switch : selects if the 208's pulse sequence switches or pulser triggers the envelope, central position is off, it can be mixed with the red banana pulse input
Self switch : switch it to the right to enable looping
LED : monitors the retrig pulse
Black banana : CV input to the retrig pulse delay
Pot : pulse delay

Orange banana outputs
Out : ADSR CV output
Inv. out : ADSR CV inverted output (negative voltage)
Switch : connects either the output or inverted output to the LPG level input, central position is off

LPG

Level
Left pot : sets the CV input amplitude
Right : sets the amplitude manually
LED : monitors the LPG opening
Black banana : CV input
Env / puls switch : selects if the 208's envelope or pulser controls the LPG level, central position is off, it can be mixed with the ADSR out / inv. out switch and CV input
Mode select
Switch : selects LPF combination or VCA mode
Black banana : mode CV input

Preamp
Signal in tinijax : signal input to the LPG
Gain switch : switch to adapt the preamp gain according to the incoming signal amplitude
Phase : switch tho the right (inv) position to invert the incoming signal phase

Output section
Channel C pot : sets the LPG output amplitude to the output mixer
Signal out : LPG and mixer output
Signal in : input to the mixer to patch one of the 208's signal outputs in order to have a single mixed signal of the 3 LPGs at the mixer output, if nothing's patched to this input, the card's LPG output only is present at the signal output which can be patched on its own directly to a mixer or effect or other module

As an option, the LPG output can also be connected via a mini slide switch directly to 208's output section via the edge connector with a small easy modification of the 208 (not the 208c as I think that unlike other revisions, there's no contact left available on the connector).

The card will be first available pre-built only for 500€ VAT and shipping excl.
Please PM or email me to join the waiting list.

The PCB set will be available for DIY later.

Thanks for watching !"