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Ljunggren Audio
Roll Your Own
Optodist
Version: Optodist/VCA 1.0
and Optodist/VCA 1.1
Bill Of Material
TYPE
PART
Resistor
R11,R12
Resistor
R5,R10
Resistor
R13,R14
Resistor
R1,R9
Resistor
R2
Resistor
R3
Resistor
R4
Diode
D2,D3
Capacitor
C3,C4,C5,C6,C10,C11
Capacitor
C2,C9
IC Socket
IC1,IC2
OpAmp
IC1,IC2
Optocoupler
LDR1 x2, LDR2 x2
socket
Optocoupler
LDR1,LDR2
Electrolytic
C7,C8
Transistor
Q1
Transistor
Q2
Trimmer
TRIM1
Jack
J1,J2,J3
Rotary Pot.
POT1
Rotary Pot.
POT2
Rotary Pot.
POT3
Switch
SW1
LED
D1
LED
D4,D5,D6,D7
Power header
POWER
Knobs
Small fluted skirtless
Screws
Black, Pozi
PCB
Faceplate
PCB material (FR4)
Power cable
Eurorack power cable
Changes from version 1.0 to 1.1
The unused R8 resistor footprint is removed.
•
The holes for the pototentiometer housing pins is enlarged to accomodate both
•
standard 9mm Alpha and custom pots.
Square instead of round pads on the jack housing pins.
•
Different PCB colour.
•
Please note: Text in red (same type of red as this text)
indicates errors in the photos taken before final
assembly instructions were written. These errors will be
adressed in the next version of the assembly manual.
VALUE
PCS NOTE
10R
2
1K
2
10K
2
68K
2
If you want your Optodist to close better for VCA duties use 10K on
R9. However, doing this will lessen the distortion effect.
100K
1
100R
1
4.7M
1
SB130
2
or 1N5818. Schottky power polarity protection
100nF
6
Ceramic X7R 2.5mm
100pF
2
Ceramic C0G 2.5mm
8 pin
2
TL072
2
or TL082
2 pin
4
One for each side of the optocouplers.
SR2/SR3
2
Silonex NSL-32SR2 or NSL-32SR3 "vactrol"
10µF
2
2mm pin pitch, 5mm dia, 5mm height
BC557B
1
BC547B
1
2K
1
Gain range calibration
3
PJ301BM
3.5mm
100K lin
1
CV Att.
22K lin
1
Or 25K lin. Gain
100K log
1
Signal in Att.
SPDT
1
On-On
Orange
1
3mm
Green
4
3mm, LED limiter, other colours may be used.
10 pin
1
boxed
cream
3
M3x6
2
Mounting screws
1
black
1
1
10pin ↔ 16pin
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Summary of Contents for RYO Optodist
- Page 1 PCS NOTE Resistor R11,R12 Resistor R5,R10 Resistor R13,R14 Resistor R1,R9 If you want your Optodist to close better for VCA duties use 10K on R9. However, doing this will lessen the distortion effect. Resistor 100K Resistor 100R Resistor 4.7M Diode...
- Page 2 Assembly instructions Empty PCB bottom Optodist 1.0 Empty PCB top Optodist 1.0 Empty PCB bottom & top Optodist 1.1...
- Page 3 Step 1 Solder resistors. Resistors are not sensitive to mounting direction. R1 68K, R2 100K, R9 68K R8 skip this one, R13 10K, R14 10K R8 is unnecessary but present in all photos, don't solder it at all. On version 1.1 this is removed. R5 1K, R10 1K R11 10R, R12 10R...
- Page 4 R3 100R R4 4.7M Step 2 Solder reverse polarity protection diodes. The stripe on the diodes must be on the same side as indicated in the silk screen. D2 SB130, D3 SB130...
- Page 5 Step 3 Solder ceramic capacitors. Ceramic capacitors are not sensitive to mounting direction. C3 100nF, C4 100nF, C5 100nF, C6 100nF, C10 100nF, C11 100nF C2 100pF, C9 100pF Step 4 Solder sockets. Match the IC sockets indent (pin 1) with the silk screens. IC1, IC2 sockets.
- Page 6 Step 5 Solder Electrolytics. Long leg is + (anode). C7 10µF, C8 10µF Step 6 Solder transistors. Match the curved side with the silk screen. Q1 BC557B Q2 BC547B...
- Page 7 Step 7 Solder trimmer. Only 3 of the 5 holes are used, the extra 2 holes are for fitting trimmers with different appearence. TRIM1 2K Step 8 Solder jacks. J1, J2, J3...
- Page 8 Step 9 Remove the nuts and washers from the potentiometers. Cut off the small metal tab sticking out indicated by a red circle below and solder them in place. Please pay attention that POT1, POT2 and POT3 is not placed in a linear order.
- Page 9 The following 2 steps (switch and LED's) can be done at the same time if you wish. Step 10 Remove the nuts and washers on the switch. The nuts are very similar looking to the jack nuts but they are not the same. The jacks nuts will not fit on the switch but the switch nuts will fit on the jacks so be careful not to mix them up with each other.
- Page 10 If you have Alpha potentiometers like the one on the left you place one washer under the panel and one nut over the panel. The last kits with theese pots were shipped in May 2014 and is long gone by now. If you have custom potentiometers like the one on the right you place two washers and one nut under the panel and one washer and one nut over the panel.
- Page 11 Step 11 D4, D5, D6, D7 (LED limiter), D1 (orange) The long leg of the LED's (anode, +) goes in the square hole. Put the LED's in place (don't solder yet) and temporary mount the panel the same way as in the previous step. Carefully flip the module over.
- Page 12 Correct the LED positions with your hands making sure each LED has slotted into their respective panel hole. Solder them in place. Step 12 Solder the keyed boxed power header. Pay extra attention to the direction. The triangle (pin 1) must be at the -12V side. In the picture below you can see the direction of the keyed opening in the boxed header.
- Page 13 Step 13 Mount the IC's and optocouplers. The IC's indent or dot marking pin 1 must match the silk screen direction. Be careful not to cut the legs too short on the optocouplers. Make sure the Optocouplers dot match the dot/bevel marking in the silk screen.
- Page 14 Step 14 Mount the panel. Use 8 mm wrench socket for the jacks and switch and 10 mm for the potentiometers. Switch: Only use one of the originally attached switch nuts and none of the original switch washers. Instead use the same washer model as for the jacks (included in the switch bag).
- Page 15 Step 16 Mount the power cable. Red stripe at -12V. Finished module!
- Page 16 Calibration Patch an audio signal with a relatively clean waveform that is easy to hear when clipping starts on, for example a sine. Listen to the audio signal. Turn up Gain fully CW (clock wise, right) position. Turn up Signal In to fully CW (clock wise, right) position. Turn down Gain CV fully CCW (counter clock wise, left) position.
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