26.09.2017 thomas henry voltage controlled crossfader/vca ... · thomas henry voltage controlled...
Post on 21-Jun-2020
27 Views
Preview:
TRANSCRIPT
©2017 y Matthias Herr a │ Do ot opy or distri ute y a y ea s │ For private use o ly │ www.FONITRONIK.de
26.09.2017
Thomas Henry Voltage Controlled Crossfader/VCA (Eurorack DIY)
IntroductionBack in 2012 Thomas Henry published this circuit as a kind of
apprentice piece. One might think that this is a rahter large
module for being just a crossfader, however, it gives you a
lot of control. A lot.
You can find a detailed description of this design at the
Thomas Henry sub-forum at electro-music.com, where he
publishes most of his newer designs.
FeaturesVoltage controlled crossfade (2-in-1),
DC/AC selector for each input,
All CV inputs with attenuator,
VCA with two VC inputs and gain control
SpecificationsThe frontpanel measures: 12HP (Eurorack)
Mounting depth behind frontpanel incl. power plug: 40mm
Power consumption: TBA
BTW this is not meant as a beginners project. I do not provide
step-by-step building instructions. I just assume that you
already build quite a few projects and know how to read the
BOM and schematics.
Page 1 of 4
©2017 y Matthias Herr a │ Do ot opy or distri ute y a y ea s │ For private use o ly │ www.FONITRONIK.de
26.09.2017
Layout/Design
General mounting instructionsThis project uses two PCBs, one board with
the actual circuitry and an additional adapter
PCB carrying the front panel components.
The adapter PCB is used to mount the PCBs
to the front panel.
The PCBs are connected using two 1x10 SIL
headers/receptables with 2,54mm pitch
(.1in). Additionally you can use stand-offs.
When these stand-offs are made from metal
they will provide an additional GND path
from main PCB to adapter PCB.
Look out for something like this:
Page 2 of 4
©2017 y Matthias Herr a │ Do ot opy or distri ute y a y ea s │ For private use o ly │ www.FONITRONIK.de
26.09.2017
BOM, Overlay for Reference & Manual Wiring Guide
Manual WiringRefer to the schematics (last page in this document) for
off-board components.
M1-1
M1-2
M1-3
M1-4
M1-5
M1-6
M1-7
M1-8
M1-9
M1-10
M2-1
M2-2
M2-3
M2-4
M2-5
M2-6
M2-7
M2-8
M2-9
M2-10
Qty Value Parts
Resistors
2 10R or ferrite F1, F2
4 220R R1 - R4
1 1k R5
1 4.7k R6
2 10k R7, R8
1 22k R11
12 100k R12 - R23
2 100k (trimmer) R24, R25
2 270k R32, R33
1 330k R34
Capacitors
3 10pF (C0G/NP0) C1 - C3
2 220n (film) C10, C11
2 10uF C12, C13
8 10n C4 - C9, DC3, DC4
2 100n DC1, DC2
Semi's
2 1N4004 PD1, PD2
2 2N3906 Q1, Q2
1 LM13700 IC1
3 TL072 IC2 - IC4
Adapter PCB & Misc
7 100k (9mm
potentiometer)
R26 - R29, R29+, R30, R31
1 Socket PJ-301B J1 - J6
2 SPDT sub-mini SW1, SW2
2 1x10 SIL header female
2 1x10 DIL header male
4 M3 Stand-off + Screws
Page 3 of 4
IC1IC2IC3IC4
(R16)
AC
DC
AC
DC
100n
100n
-12V
+12V
10R or ferrite
10R or ferrite
1N4004
1N4004
LM13700
LM13700
10n
10n
TL072
TL072
10n
10n
TL072
TL072
10n
10n
10pF
100k
100k
100k
220R
100k
+12V
-12V
100k
220R
10pF
100k
100k
220R
100k
+12V
-12V
100k
220R
100k
10pF
100k
1k
220n
220n
100k
270k 4.7k
2N3906
2N3906
TL072
TL072
10n
10n
22k
10k
10k270k
330k
100k
100k
+12V-12V
CROSSFADE
GAIN CV1
GAIN CV2
+12V
+12V
-12V
IN-A SPDT sub-mini
IN-B SPDT sub-mini
OUT
EURO-1
EURO-2EURO-3
EURO-4EURO-5
EURO-6
EURO-7EURO-8
EURO-9EURO-10
1
MTA-156
DC1
DC2
F1
F2
PD1
PD2
U$5U$6
U$7U$8
4
3
1
5IC1A
13
14
16
12IC1B
7 8
10 9
11
6
C4
C5
2
31IC2A
6
5
7IC2B
84
C6
C7
2
31IC3A
6
5
7IC3B
84
C8
C9
C1
R16
R17
R20
R1
AE
S
R24R21
R2
C2
R19
R22
R3
AE
S
R25R23
R4
R18
C3
R12
R5
C10
C11
R13
R32 R6
Q1
Q2
2
31
IC4A
6
57
IC4B
84
DC3
DC4
R11
R8
R7R33
R34
R15
R14
M1-1
M1-2
M1-3
M1-4
M1-5
M1-6
M1-7M1-8
M1-9
M1-10
M2-1
M2-2
M2-3
M2-4M2-5
M2-6
M2-7
M2-8
M2-9M2-10
R26100k
R28100k
R29100k
R29+100k
J1
J2
J3
R27100k
R30100k
J4 SW1
R31100k
J5 SW2
J6
Q2
Q2
Q1
Q1
THOMAS HENRY VC-Crossfader/VCARev June 24, 2009
Redrawn schematic by Matthias Herrmann 2017
1.0
++
GND
+15V
-15V
Page 4 of 4
top related