Lithium Grim Humming Bee OD Manual de instrucciones

Humming Bee OD

Building instructions

V1.0.1

Table of contents

Components ............................................................................................................................................ 3

General guideline for components.......................................................................................................... 4

General building tips ............................................................................................................................... 4

Modifications........................................................................................................................................... 4

Offboard wiring ....................................................................................................................................... 5

Troubleshooting ...................................................................................................................................... 6

Schematic ................................................................................................................................................ 7

Components

Part

Value

Comment

Part

Value

Comment

4n7

MKT

IC1

OP275

Socket

22n

MKT

51R or 47R

4n7

MKT

47k

22n

MKT

360k

22n

MKT

47k

4n7

MKT

220n

MKT

6k8

MKT

C10

22u

Electrolyte

R10

13k7

C11

22u

Electrolyte

R11

2k61

C12

100u

Electrolyte

R12

10k

C13

MKT

R13

C14

22u

Electrolyte

R14

47k

C15

100p

Ceramic

R15

5k6

1N5817

R16

150k

Red 3mm LED

Socket

R17

Red 3mm LED

Socket

R18

5k6

Red 3mm LED

Socket

VR1

A500k

Drive

1N4007

VR2

B50k

Focus

1N4007

VR3

B50k

Volume

* Parts marked in red are specialty parts

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.

Offboard wiring

Tip

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

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.

Schematic

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