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ADSR CONTROLLER

Desval27·FormantKO·modules/ADSR_CONTROLLER/ADSR_CONTROLLER.kicad_pcb

ADSR CONTROLLER PCB layout, top view — open source board by Desval27
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About the ADSR CONTROLLER PCB

ADSR CONTROLLER is an open source PCB design by Desval27, published on GitHub under the MIT license. It is a 2-layer board measuring 160 × 100 mm, with 77 components from 40 distinct parts.

Other key parts include the OpAmp. By type, the board carries 30 resistors, 22 connectors, 6 ICs, 6 diodes, 5 transformers and 4 capacitors.

It belongs with the audio designs in this gallery.

From the project

Knock-off of the Elektor Formant Synthesizer project with the initial goal of being quasi-authentic and secondary goal undecided. Probably tweaks of some kind.

The ADSR Controller expands the capabilities of the standard Formant ADSR module by adding clock-driven repeat and delayed triggering functions. An external square-wave clock source (typically an LFO or VC-LFO) can repeatedly retrigger the envelope, enabling rhythmic modulation and gated effects. Repeat operation may be disabled, run continuously (Auto), or only while an external or keyboard gate is active. An adjustable delay function can also postpone envelope triggering, making the module useful for creating delayed attacks, repeating envelopes, and more complex modulation patterns.

ADSR CONTROLLER, from the project README
From the project README

Main components on the ADSR CONTROLLER

OpAmp

ADSR CONTROLLER bill of materials (BOM)

77 components, 40 distinct parts — part numbers from the project's BOM.

QtyPartRefs
6
OpAmp
IC1, IC2, IC3, IC4, IC5, IC6
1
CardConnector
J1
1
GATE SELECT
J2
1
IOS SELECT
J3
1
MonoJack
J4
1
S1A
S1a
J5
1
S2A
S2a
J6
1
S2B
S2b
J7
1
SQR in
J8
3
GND
J9, J10, J15
1
P2A
P2a
J11
1
P2B
P2b
J12
1
S2M
S2m
J13
1
S3A
S3a
J14
1
S1M
S1m
J16
1
S2C
S2c
J17
1
S3M
S3m
J18
1
S3B
S3b
J19
1
1k
P1
1
1M
P2
Show 20 more
QtyPartRefs
1
1k
P3
1
CardBracket
MH1
2
SW
S1, S3
1
MODE
S2
5
BC109C
T1, T2, T3, T4, T5
4
DUS
D1, D2, D3, D6
2
DUG
D4, D5
1
10N
10n
C1
1
2µ2
C2
2
10µ
C3, C4
11
100K
100k
R1, R2, R4, R8, R9, R10, R13, R14 +3
3
4K7
4k7
R3, R7, R18
3
10K
10k
R5, R17, R23
2
27K
27k
R6, R24
4
33K
33k
R11, R16, R22, R30
2
5K6
5k6
R12, R15
1
1k
R19
1
220R
R20
2
6K8
6k8
R25, R28
1
330R
R29

ADSR CONTROLLER design files

The KiCad project lives in the Desval27/FormantKO repository on GitHub; these links point at the commit this page was built from.

ADSR CONTROLLER: common questions

How big is the ADSR CONTROLLER PCB?

The ADSR CONTROLLER measures 160 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ADSR CONTROLLER?

77 components, from 40 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the ADSR CONTROLLER design files?

From the Desval27/FormantKO repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the ADSR CONTROLLER design in my own project?

Yes, under the terms of its MIT license, which Desval27 chose for the repository.

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