Bill of Materials - PCB
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 it.
R1, R15
1 M
Ω
no
R2, R17
1 k
Ω
no
R3, R5, R7,
R9
47
Ω
no
R4, R6, R8,
Rx
4.7 k
Ω
no Rx doesn’t go on the PCB, but on
the panel (see below). You can
substitute it for a lower value
if you like the LED to be
brighter. Do not go below 50
Ω
.
R10, R11, R12
220 k
Ω
no You could experiment with
different resistor values in
case you’re using different
types of touch plates. Don’t go
below 100k or above 1M though.
R13, R14, R16
10 k
Ω
no
C1, C2, C3
1000 µF
yes
C4, C5, C6
1 µF
yes
C7
3.3 nF
no
C8
4.7 µF
yes
C9
10 µF
yes
