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IC's have a specific orientation. If you install them wrong, your synth will not work and you could
damage or destroy the IC. Each IC has a dot, divot, or a flat side at one corner or end. These
features have a corresponding graphic on Figure 3 to show you how to orient the IC.
a. LM386 (U3): This chip is the audio amplifier and drives the speaker and line out jack. Install
it in the cluster of eight holes at U3. Notice the divot at one end of the chip. There is a
matching shape on the PCB graphic. Also, the dot on
the IC (near pin 1) should line up with the square
pad on the board (35). Press the amp down snugly
with your fingertip. Mount the PCB in your clamp
and tack one leg down with solder from the
component side (36). Now flip the board over
and finish soldering the rest of the leads (37).
35
37
b. 6N138 Optocoupler (U4): Install the optocoupler at U4. The corner lead marked with a tiny
dot goes into the hole with the square pad (38). Solder this chip in the same manner as the
last one (39).
38
TIP: You can use some
painter's tape to hold down the IC
to the top of the PCB while you solder
it in from the back.
36
39
19
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