Ldb-1 kit instructions – Delptronics LDB-1 Analog Drum Machine User Manual
Page 6
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
Refdes
TL072
2
U1, U3
TL074
1
U2
PIC12F508
1
U4
PIC18F26K22 1
U6
6N138N
1
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