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C2
Capacitance
100nF
C4
Capacitance
100nF
C17
Capacitance
10uF
C14
Capacitance
27pF
C12
Capacitance
100nF
C24
Capacitance
10uF
C13
Capacitance
27pF
C1
Capacitance
100nF
C10
Capacitance
100nF
C26
Capacitance
100nF
C19
Capacitance
68pF
C9
Capacitance
100nF
C5
Capacitance
100nF
C6
Capacitance
100nF
C25
Capacitance
100nF
C11
Capacitance
1uF
C8
Capacitance
1uF
C22
Capacitance
4u7 F
C3
Capacitance
100nF
C7
Capacitance
100nF
C23
Capacitance
100nF
EXTERNAL FLASH CIRCUIT
D2
Color
Green
User LED for blinking and testing the board
R19
Resistance
1k5 Ω
Cl = 2(Ccap_load - Cstray)
R9
Resistance
10kΩ
SOLAR POWER INTERFACE
R14
Resistance
6k8 Ω
R8
Resistance
15kΩ
R13
Resistance
68kΩ
R4
Resistance
1kΩ
R2
Resistance
27.4 Ω
POWER CIRCUIT
Pull up resistors
Line 1
R6 and r9 are are pull ups for the SD Card line
Line 2
Line 2
Termination resistors
R18
Resistance
1kΩ
C8 Should be close to pin 44 of RP2040
MICROCONTROLLER
R16
Resistance
50 Ω
C11 Should be close to pin 45 of RP2040
Iset = 6800 / Rset = 1A
R17
Resistance
50 Ω
R7
Resistance
2kΩ
R1
Resistance
27.4 Ω
I_ch = (Vset / Rset) * 900 = 900mA
R3
Resistance
10kΩ
R6
Resistance
10kΩ
L2
Inductance
2u2 H
SW1
U1
U5
Y1
U3
U2

AvocAudio - Fully Placed d889 ec31