Delptronics LDB-1 Analog Drum Machine - Manual (Page 5)

LDB-1 Kit Instructions Page 5 of 8
Bottom Side Components
The pushbuttons, LED s, 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. Fully build and test the kit.
2. Turn the power off.
3. Hold down the BD button.
4. Power on the unit.
5. 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.