Lithium Grim Humming Bee OD Instruction Manual

1
Humming Bee OD
Building instructions
V1.0.1

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

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Components
Part
Value
Comment
Part
Value
Comment
C1
4n7
MKT
IC1
OP275
Socket
C2
22n
MKT
R2
51R or 47R
C3
4n7
MKT
R3
1M
C4
1n
MKT
R4
47k
C5
22n
MKT
R5
360k
C6
22n
MKT
R6
47k
C7
4n7
MKT
R7
1M
C8
220n
MKT
R8
6k8
C9
1u
MKT
R9
3k
C10
22u
Electrolyte
R10
13k7
C11
22u
Electrolyte
R11
2k61
C12
100u
Electrolyte
R12
10k
C13
1u
MKT
R13
2k
C14
22u
Electrolyte
R14
47k
C15
100p
Ceramic
R15
5k6
D2
1N5817
R16
150k
D3
Red 3mm LED
Socket
R17
1k
D4
Red 3mm LED
Socket
R18
5k6
D5
Red 3mm LED
Socket
VR1
A500k
Drive
D6
1N4007
VR2
B50k
Focus
D7
1N4007
VR3
B50k
Volume
* Parts marked in red are specialty parts

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General guideline for components
Capacitors: All values under 1nF should be ceramic disks. From 1nF up to 1uF should be MKT
(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 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. It is best to solder diodes D2, D6 and D7 in an upright position
(remember the polarity) so do not solder them yet. Next, solder the sockets for the IC’s and LED’s.
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, the Diodes D2,6 and 7, then you can solder the MKT
capacitors (not the 1u ones!) and the electrolyte capacitors. Now finish by soldering the 1u MKT
capacitors. Place the IC’s and transistors 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.
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 1590BB will give you more
room to experiment with.
Modifications
You can experiment with different types of 3 mm LED’s. It is reported that green LED’s are very
suitable as replacements.

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Offboard wiring
S
Tip
Tip
Ring
Ring
Output Jack
Input Jack
Cathode (short leg)
Anode (long leg)
Footswitch
Sleeve
R led
Notice that in the “off” position the effect input is connected to ground to prevent possible
oscillation.
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 resistor.
Blue = pin 1
White = pin 2
Yellow = pin 3

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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.

7
Schematic