Lithium Grim Humming Bee OD Instruction Manual

Humming Bee OD
Building instructions
V2.0

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Table of contents
Components ............................................................................................................................................ 3
General guideline for components.......................................................................................................... 4
General building tips ............................................................................................................................... 4
Modifications........................................................................................................................................... 5
Offboard wiring ....................................................................................................................................... 6
Troubleshooting ...................................................................................................................................... 7
Schematic ................................................................................................................................................ 8

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Components
Name
Value
Comment
Name
Value
Comment
C1
4n7
SMF/MKT/Wima
IC1
OPA275
C2
100p
MLCC/Ceramic
P1
A500k
Drive (PCB mount)
C3
220n
SMF/MKT/Wima
P2
B50k
Focus (PCB mount)
C4
22u
Electrolytic 25V+
P3
B50k
Volume (PCB mount)
C5
1u
SMF/MKT/Wima
R1
1M
1% metalfilm
C6
22n
SMF/MKT/Wima
R2
360k
1% metalfilm
C7
4n7
SMF/MKT/Wima
R3
6k8
1% metalfilm
C8
22n
SMF/MKT/Wima
R4
1k
1% metalfilm
C9
22n
SMF/MKT/Wima
R5
5k6
1% metalfilm
C10
1n
SMF/MKT/Wima
R6
3k
1% metalfilm
C11
22u
Electrolytic 25V+
R7
2k
1% metalfilm
C12
1u
SMF/MKT/Wima
R8
13k7
1% metalfilm
C13
4n7
SMF/MKT/Wima
R9
10k
1% metalfilm
C14
100n
SMF/MKT/Wima
R10
150k
1% metalfilm
C15
100u
Electrolytic 25V+
R11
1M
1% metalfilm
C16
47u
Electrolytic 25V+
R12
2k61
1% metalfilm
D1
LED
Red 3mm
R13
5k6
1% metalfilm
D2
LED
Red 3mm
R14
47k
1% metalfilm
D3
1N4007
R15
51R
1% metalfilm
D4
1N4007
R16
47k
1% metalfilm
D5
LED
Red 3mm
R17
47k
1% metalfilm
D6
1N5817
* Parts marked in red are specialty parts
A=Log, B=Lin, C=Rev. Log
Dimensions:
49,2 mm x 44,5 mm
1.94 inch x 1.75 inch

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General guideline for components
•Capacitors: All values under 1nF should be ceramic disks. From 1nF up to 1uF should be
SMF/MKT/Wima (foil/metalfilm capacitors) and over 1uF use electrolyte caps (or tantalum)
16V+ rated and watch out for polarity!
•Resistors: use 1% metalfilm for the best results.
•Socket all IC’s and maybe even the 3mm LED’s. This way you can easily mod them or replace
them if they break.
General building tips
Soldering this board can be complicated for some people since the solder pads can be very close
together. Use a magnifying glass to make the job easier.
Start by soldering the resistors and the diodes D3, D4 and D6. Next, solder the sockets for the ICs and
if you want to the LEDs. For the LED’s you can buy a 20 pin SIL socket and cut of the pins you need.
IC1 requires a 8 pin DIL socket. Now solder the ceramic capacitors, then you can solder the 3mm
LEDs D1, D2 and D5 (You might need to shorten the legs of LEDs to fit the holes!). Now solder the
MKT capacitors (not the 1u ones!) and the electrolyte capacitors. Now finish by soldering the 1u MKT
capacitors.
Now for the tricky part. Before you start to solder the potentiometers, you should first drill the holes
in your enclosure. The pattern is as follows (top view):
17,8mm
Volume Drive
Focus
17,8mm 17,8mm
Before you start drilling measure twice!
Insert the potentiometers in the holes of the enclosure and attach the PCB. Note that the PCB mount
potentiometers will be attached on the back of the PCB. When everything fits ok, solder the
potentiometers to the PCB.
Place the IC’s (and if socketed the LEDs) and you are almost ready to rock. The white triangle on the
IC’s point to where pin 1 of the IC should be inserted.

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Besides the components mentioned in the table on the first page, you will need:
•2 input jacks. 2 mono jacks if you are not going to use a battery but only the 9V adapter. 1
mono (for output) and 1 stereo jack (for input) if you will be using both a 9V battery and the
9V adapter.
•3PDT footswitch (9 pins). I also carry an easy off board circuit for this.
•2,1mm DC jack (isolated).
•9v battery clip (optional).
•22 gage stranded hook-up wire.
•Hammond 1590B case (or similar) in your favourite colour. A 125B (Hammond 1589N1) will
give you more room to experiment with.
Modifications
You can experiment with different types of 3 mm LED’s. It is reported that clear green LED’s are very
suitable as replacements.
You can also try different OpAmps for IC1 like the TL072,OPA2134, NE5532, JRC4580D, JRC4558 or
any other pin compatible DIP-8 dual OpAmp.

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Offboard wiring
Notice that in the “off” position the effect input is connected to ground to prevent possible
oscillation. The diagram is also based on star wiring where all ground connections go to the sleeve of
the input jack.
The LED requires a resistor (R led in the diagram) depending on the type of LED you are using. An
ultra-bright red or blue LED requires a 3k3/4k7 resistor.
S
Tip
Tip
Ring
Ring
Output Jack
Input Jack
Cathode (short leg)
Anode (long leg)
Footswitch
Sleeve
R led

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Troubleshooting
All PCB’s have been e-tested 100% in the factory, so there should not be a connection problem on
the PCB itself.
The board is not working (at all), what now?
•Check if your 9V is plugged in correctly (and/or soldered correctly on the board).
•Check that you oriented the capacitors, IC’s ,transistors and diodes the right way. MKT
capacitors and resistors do not need to be oriented.
•Check if you used the correct values of the components. For resistors you can look here:
http://www.diyaudioandvideo.com/Electronics/Color/
•Double and triple check your soldering! A lose or cold solder can be really bad for your board.
•Replace the IC’s and transistors, one might be defective. Before doing that first unplug the 9V
and wait 5 seconds.
•Check that you have good/high grade components. A lot of Chinese sourced parts are fakes
(especially high end opamps) so be careful that you source your parts from reliable suppliers.

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Schematic