Kit Assembly Instructions

Kit Assembly Instructions
LDB-1 Kit Instructions
Page 1 of 8
Important Information
Congratulations and thank you for your purchase of the LDB-1 “Little Drummer Boy” Analog Drum Machine Kit!
Before you start, please read the enclosed Electronic Kit Soldering Tutorial. It contains important and useful
information even for experienced kit builders. If this is your first electronic kit, you sure picked a big one. It is not
difficult to assemble, but there are a lot of parts. Take your time and be careful to put the right part in the right place.
It is not easy to de-solder parts if you make a mistake.
With some parts, it is important that the right lead goes in the right hole in the PCB (printed circuit board). For
example electrolytic capacitors are polarized (they have a positive lead and a negative lead). Ceramic capacitors are
not polarized, so it does not matter which of the two leads goes in which of the two holes. In these instructions the
symbol (±) highlights parts that must be inserted with a particular orientation.
The PCB is not marked with part values, but rather with reference designators (refdes). For example R1 refers to
resistor number one and C1 refers to capacitor number one. Once the part value is identified, it is easy to find the
refdes on the PCB.
The parts in the kit are in two bags. One bag contains discreet components like resistors and capacitors, and the
other bag contains electromechanical parts like jacks and switches. The discreet components are soldered first.
Before you start, separate the parts by type. When you are ready to solder parts of a particular type, then separate
them by value. In general, the order that the parts are soldered onto the PCB is shortest to tallest.
In the instructions below, each part type is followed by the PCB outline for that part. Refer to the enclosed
photograph of the completed kit for assistance with part identification.
Top Side Parts
The first group of parts are mounted on the “top” side of the PCB (the side with writing on it), and soldered on the
“bottom” side. Only the pushbuttons, LEDs, and potentiometer are mounted on the bottom side.
Chip Sockets (±)
There are four 8-pin sockets and three 14-pin sockets. Sockets are marked with a small U-shaped notch that must
line up with the outline on the PCB. Once the socket is soldered in place, the PCB outline will not be visible, so it is
important that the sockets are oriented correctly in order to ensure that the chips are inserted correctly.
Note that two of the 14-pin sockets go right next to each other to accommodate the 28-pin PIC18F26K22 chip.
Diodes (±)
There are 20 diodes. All of the diodes are the same value, so they have no refdes on the PCB, just a distinctive
outline. The diodes are red and black glass. When inserted into the PCB, the black side of the diode must line up
with the stripe on the part outline on the PCB. The diode leads need to be bent close to the body of the diode. Hold
the diode body and press down on each lead right at the body to make a U shape.
LDB-1 Kit Instructions
Page 2 of 8
Resistors
The value of a resistor is indicated by colored stripes on its body. In all cases the fifth stripe is brown (indicating 1%
tolerance), so that stripe has been omitted from the chart below.
The resistor leads need to be bent close to the body of the resistor. Hold the resistor body and press down on each
lead right at the body to make a U shape.
We recommend that you start with the 1K resistors because that is the most common value. Once they have been
soldered onto the PCB, it will be much easier to find the other refdes values.
Value
100R
220R
470R
560R
1K
2K2
3K3
4K7
10K
15K
22K
33K
47K
82K
100K
470K
1M
2M2
4M7
Marking (colored stripes)
Quantity
brown black
black black
4
red
red
black black
1
yellow violet
black black
1
green blue
black black
1
brown black
black brown
12
red
red
black brown
1
orange orange black brown
1
yellow violet
black brown
1
brown black
black red
5
brown green black red
1
red
red
black red
4
orange orange black red
1
yellow violet
black red
5
gray
red
black red
1
brown black
black orange
8
yellow violet
black orange
2
brown black
black yellow
9
red
red
black yellow
1
yellow violet
black yellow
3
Refdes
R54, R55, R56, R57
R58
R59
R10
R20, R27, R29, R32, R34, R38, R40, R43, R45, R50, R51, R60
R48
R49
R30
R7, R11, R35, R39, R44
R17
R8, R22, R52, R53
R23
R13, R15, R36, R41, R46
R9
R1, R2, R3, R4, R26, R31, R61, R62
R14, R16
R5, R6, R12, R18, R21, R24, R25, R28, R47
R33
R19, R37, R42
Ceramic Capacitors
Ceramic capacitors are very small tan or blue blobs. Their value is marked on them with a three digit code. The
marking is rather small, so you may have to use a magnifying glass to read them.
We recommend that you start with the 0.01 uF capacitors because that is the most common value. Once they have
been soldered onto the PCB, it will be much easier to find the other refdes values.
Value
68 pF
470 pF
0.001 uF
0.0033 uF
0.0068 uF
0.022 uF
0.033 uF
0.047 uF
0.068 uF
0.1 uF
0.33 uF
0.47 uF
1 uF
Marking
680
471
102
332
682
223
333
473
683
104
334
474
105
Quantity
1
3
1
4
2
2
4
2
2
11
1
1
1
Refdes
C22
C12, C19, C23
C8
C9, C10, C16, C17
C28, C29
C32, C33
C26, C27, C30, C31
C11, C18
C34, C35
C1, C2, C3, C4, C5, C6, C7, C15, C21, C25, C38
C24
C13
C20
LDB-1 Kit Instructions
Page 3 of 8
Electrolytic Capacitors (±)
There are three electrolytic capacitors. Each one is a different value, which is clearly printed on the capacitor.
Electrolytic capacitors are polarized, so which lead goes in which hole is important. The negative lead on the
capacitor is the shorter one and it is marked with a gray stripe on its body. The positive lead is longer. The positive
hole on the PCB has a square pad and is marked with a plus sign.
Value
2.2 uF
4.7 uF
100 uF
Quantity
1
1
1
Refdes
C14
C36
C37
Transistors (±)
There are three 2N3904 transistors. All three of the transistors are the same value, so they have no refdes on the
PCB, just a distinctive outline. Note that the outline for U5 is similar to that of a transistor, but it is clearly labeled “U5”
on the PCB.
Make sure that the flat side of the transistor lines up with the flat side of the outline on the PCB. The transistors will
not sit flush against the PCB. Do not force them down any further than they will go with a little pressure.
Transistors are more heat sensitive than most of the parts in this kit, so take care not to let the soldering iron linger
too long. If you are unsure, then solder one lead at a time and let the part fully cool off before soldering the next lead.
Voltage Reference (±)
The voltage reference chip (refdes U5) has the same basic shape as a transistor. There are several ways to tell them
apart. First and foremost, U5 is marked with the part number TLE2426. Second, U5 is loose and the three
transistors are taped to a piece of cardboard. And, finally, U5’s leads are straight and close together, while the
transistor leads are bent and further apart. When you put them side by side, the differences become immediately
apparent. When in doubt, read the marking on the part.
Make sure that the flat side of U5 lines up with the flat side of the outline on the PCB. The leads on U5 are closer
together than the holes in the PCB. Gently spread the leads out and press down on the part. It will not sit flush
against the PCB. Do not force it down any further than it will go with a little gentle pressure.
The voltage reference chip is more heat sensitive than most of the parts in this kit, so take care not to let the
soldering iron linger too long. If you are unsure, then solder one lead at a time and let the part fully cool off before
soldering the next lead.
Programming Header
This part is optional, and is used only for reprogramming the microcontroller brain of the LDB-1. If you install it, make
sure it is seated flush against the PCB and points straight up.
LDB-1 Kit Instructions
Page 4 of 8
Power Switch
The power switch can only be inserted one way. The switch actuator faces away from the PCB. Make sure it is
seated flush against the PCB before soldering it. The switch will not stay in place by itself, so you may want to tape it
in place while you solder it. Another tip is to solder only one of the pins, then check to make sure it is flush. If it is not
flush, it is simple to reheat the one solder joint while pressing the switch into place. Once one pin is secure, the
switch will stay in place while you solder the other pins.
Power Jack
The type M power jack can only be inserted one way. The opening of the jack faces away from the PCB. It will stay
in place fairly well once inserted, however care must still be taken to ensure that it is seated flush against the PCB.
1/8 inch Jacks
The four 1/8" jacks can only be inserted one way. The openings of the jacks face away from the PCB. Make sure
they are seated flush against the PCB before soldering it. They snap into place and will stay put once inserted.
MIDI / DINsync Jack
The MIDI jack can only be inserted one way. The opening of the jack faces away from the PCB. Make sure it is
seated flush against the PCB before soldering it. This jack will not stay in place by itself, so you may want to tape it in
place while you solder it. Another tip is to solder only one of the pins, then check to make sure it is flush. If it is not
flush, it is simple to reheat the one solder joint while pressing the jack into place. Once one pin is secure, the jack will
stay in place while you solder the other pins.
Battery Holder (±)
The battery holder wires are first threaded down through the hole next to the battery pads, arched over, then soldered
in place on top of the board. This keeps the battery wires from getting accidentally pulled out of the PCB. The black
wire goes in the hole with the square pad, and the red wire goes in the hole with the round pad.
After you have soldered the leads, gently pull the wires back through the hole so that they lie flat against the bottom
of the PCB. That way, they won’t interfere with the overlay. Refer to the photo of the completed kit for reference.
LDB-1 Kit Instructions
Page 5 of 8
Bottom Side Components
The pushbuttons, LEDs, and potentiometer are mounted on the “bottom” side of the PCB (the side without writing)
and soldered on the “top” side. There are no part outlines on the bottom, but it is very easy to see where these parts
go. They are all arranged around the edges of the PCB. When you go to solder the bottom side parts, you will see
the leads sticking up through the part outline on the top side. Also, refer to the photo of the completed kit for
reference.
The included control panel overlay only fits if the pushbuttons, LEDs, and potentiometer are mounted on the bottom.
If you choose to mount these parts on the top, you are free to do so, and the LDB-1 will still work fine.
To tell the LDB-1 that you have mounted the controls top side, follow this one-time procedure:
1.
2.
3.
4.
5.
Fully build and test the kit.
Turn the power off.
Hold down the BD button.
Power on the unit.
Wait for the mode LED to light up.
Pushbuttons
There are 12 pushbuttons. They snap into place and stay put while being soldered. Make sure they are seated flush
against the PCB before soldering them. Note that they are rectangular, not square, so if the pins are not lining up,
rotate it 90 degrees.
LEDs (±)
There are 12 LEDs. They are polarized, so the direction that they are inserted into the PCB is important. Make sure
that the flat side of the LED lines up with the flat side of the shape on the PCB. You can also be sure that it is
oriented correctly because the negative lead is the shorter one, and it goes in the hole indicated by the square pad.
Make sure the LEDs are seated flush against the PCB before soldering them. If they are tilted, or are at different
heights, then the overlay will not go into place correctly. The usual method of soldering leaded components is to
insert the part into the PCB and bend the leads to keep it in place when you turn the PCB over to solder. Do not use
that method, or the LEDs will not be flush.
Potentiometer
The potentiometer can only be inserted one way. It snaps in place and will stay there while you solder it. Be careful
to press down evenly so you do not bend the pins. Make sure it is all the way in and seated flush against the PCB
before soldering it.
LDB-1 Kit Instructions
Page 6 of 8
Chips
There are six chips. Carefully insert each chip into its appropriate socket, making sure not to bend any of the pins.
Note the direction of the chips before inserting them. The notch on the chip must line up with the notch on the socket.
Refer to the photo of the completed kit for reference.
The chip pins come from the factory a little bit splayed out, not pointing straight down. You may need to bend them
inward a little before you insert them. Hold the body of the chip and rest all of the pins on one side against the table
top and gently press down just a little bit. Then do the other side. If the pins do not line up well with the socket,
repeat the straightening procedure.
Value
Quantity
TL072
2
TL074
1
PIC12F508
1
PIC18F26K22 1
6N138N
1
Refdes
U1, U3
U2
U4
U6
U7
Inspection
At this stage, pause to inspect your work. Compare your PCB to the photo. Make sure that:






You didn’t forget a part.
The chips are oriented correctly.
All of your solder joints are good.
There are no solder bridges (blobs of solder covering two leads/pins).
The leads are clipped off short – right above the solder.
The bottom side parts are seated flush against the PCB.
Test
1.
Insert a new 9V battery in the battery clip and turn on the LDB-1. The first time you turn it on, there will be one to
two second pause, then the mode LED should come on. If it does not come on, then something is wrong.
Turn off the LDB-1, remove the battery and reinspect your work. Otherwise, go to the next step.
2.
Insert a mono 1/8" (3.5mm) plug into the Audio output jack and plug the other end of the cable into your amplifier
or mixer.
3.
The LDB-1 starts in the “Play Drums” mode. Press the buttons along the bottom of the LDB-1 to play individual
drum sounds. If you do not hear sounds, or if a particular drum does not sound, then something is wrong.
Turn off and unplug the LDB-1 and reinspect your work.
4.
If you have gotten this far, then you are good to go!
Feet & Control Panel Overlay
The overlay covers most of your soldering, so it is best to test the LDB-1 before putting it on. Turn the PCB bottom-up
so that the buttons and LEDs are facing up. Place the overlay over the entire board so that the LEDs, buttons and
potentiometer come through the holes. Insert the threads of a foot through one of the holes in a corner of the PCB
and thread the nut onto the foot. It is easier to hold the nut and turn the foot. Repeat for the other three feet.
Congratulations!
You have successfully built an LDB-1 “Little Drummer Boy” Analog Drum Machine!
Download the User Manual here: http://delptronics.com/documents/LDB1UserManual.pdf
LDB-1 Kit Instructions
Top / Component Side of Circuit Board
Show before bottom side components have been soldered.
Page 7 of 8
LDB-1 Kit Instructions
Bottom / Controls Side of Circuit Board
Detail showing foot, nut and overlay assembly.
Page 8 of 8
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