SW1
SW5
SW2
SW9
SW3
SW10
SW13
J1
SW15
SW14
SW4
SW11
SW16
SW7
SW8
SW12
SW6
VR1
Resistance
20kΩ
VR2
Resistance
20kΩ
VR4
Resistance
20kΩ
VR3
Resistance
20kΩ
U1
R25
Resistance
6.8kΩ
R24
Resistance
6.8kΩ
Note 3
Line 1
CD74HC067 Multiplexor
R4
Resistance
10kΩ
Note 2
Line 1
Teensy 4.1 MCU
R18
Resistance
6.8kΩ
R9
Resistance
10kΩ
R1
Resistance
10kΩ
R13
Resistance
10kΩ
R21
Resistance
3.3kΩ
R12
Resistance
10kΩ
R7
Resistance
10kΩ
R17
Resistance
3.3kΩ
R3
Resistance
10kΩ
R6
Resistance
10kΩ
R14
Resistance
10kΩ
C16
Capacitance
0.1uF
R20
Resistance
3.3kΩ
R22
Resistance
3.3kΩ
R16
Resistance
10kΩ
R8
Resistance
10kΩ
R2
Resistance
10kΩ
R19
Resistance
3.3kΩ
R11
Resistance
10kΩ
U4
R15
Resistance
10kΩ
R23
Resistance
6.8kΩ
R10
Resistance
10kΩ
Note 1
Line 1
5V input voltage for multiplexor
R26
Resistance
6.8kΩ
R5
Resistance
10kΩ