The easiest way to solder this header is to first melt just a bit of
solder on one of the 4 pads on the board. Then plug the female Dupont
connector of one of the 4-pin cables into the header. This will make
it easy to hold while soldering without burning your fingers. Now
solder one of the legs to the pad you have applied solder to. Remove
the cable and solder the other legs.
Do not put any of the pots or switches in at this time. Put the panel
aside and continue with the PCB.
PCB Bottom Side
Solder the bottom side components as described below the table. Where
polarity matters, it means you need to pay attention which way you
solder the components to the PCB or panel. Diodes have a black line on
them which needs to match the line on the PCB. Electrolytic capacitors
have a short leg that goes on the minus (“-”) side, and they’re also
marked with a printed stripe on this side. The IC has a dot that must
match the notch in the socket. And this in turn should match the gap
on the PCB. Double check the polarity! If the IC is flipped, you will
see the infamous magic smoke and likely destroy the IC and potentially
your PSU!
(D are diodes, R are resistors, C are capacitors, U are the
potentiometers as well as the IC and its DIP8 socket, S are switches
and LED are, you might have guessed it, LEDs.)
Part
Type
Polarity
matters?
Notes
D1, D2
BAT85
yes Distortion diodes. Can be
substituted by BAT54. You may
try other Schottky diodes as
well, but regular diodes such as
1N4001 won’t have the same edge
to them.
R1, R15
1 M
Ω
no