ER-808 – Assembly Guide
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Page 2 of 5
Introduction
LM13700 through hole parts are being phased out. You may need to use a SOIC version of this part and
install in a 16 pin SOIC to PDIP adapter so that it can be installed in the IC socket.
BOTTOM mounted parts
Install and solder all the parts listed in the BOM as BOTTOM mounting parts. Cut all these leads flat to
the PCB.
For R40, start with 10k and consider changing it later if you want to change the sound.
TOP mounted parts:
Resistors
Arrange the resistors by value on the workbench in the same order as listed in the BOM and install each
numbered part for that value before moving onto the next.
Consider changing R32 later if you want to change the sound.
Install the resistors on the TOP of the board. Take care not to mix up resistors which have similar color
codes.
Solder and clip the leads.
Diodes
Install the diodes on the TOP of the board. Align the stripe on each diode with the stripe marked on the
board. Solder and clip the leads. Do not mix up signal, power, schottky and zener diodes, some of them
look the same. Now go back and check the polarity against the silk screen for each diode.
IC Sockets
Install the sockets on the TOP of the board. Observe the notch or mark on the sockets and align with
the notch or mark on the board. Solder.
Bus header
Install the 10 pin right angle bus socket on the BOTTOM of the board. This must be installed with the
correct orientation or the module will be damaged when the power is connected.
The cut-out in the socket should face the words "BUS HEADER", as shown in the photo.
The header must be completely flat and aligned with the PCB so clean up any joints that interfere with
this.
