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U1
MK1
please explain what R13, L2, C24, C16, R14, R8, C17, C23, VBAT, VOLTAGE REGULATO...
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R2
Resistance
27.4 Ω
R13
Resistance
68kΩ
R15
Resistance
10kΩ
R10
Resistance
470 Ω
R9
Resistance
10kΩ
R4
Resistance
1kΩ
R19
Resistance
1k5 Ω
R18
Resistance
1kΩ
R16
Resistance
50 Ω
R11
Resistance
1k5 Ω
R14
Resistance
6.8kΩ
R8
Resistance
15kΩ
R7
Resistance
2kΩ
R12
Resistance
50 Ω
R17
Resistance
50 Ω
R5
Resistance
5kΩ
R3
Resistance
10kΩ
R6
Resistance
10kΩ
R1
Resistance
27.4 Ω
C28
Capacitance
100nF
EXTERNAL FLASH CIRCUIT
+3V3
VUSB
CRYSTAL OSCILLATOR
C14
Capacitance
27pF
Can connect a DHT11 or DHT22 Sensor
+1V1
+3V3
One-Wire protocol relies on the bus being pulled high by the pull-up resistor when not actively transmitting
C1
Capacitance
100nF
Decoupling Capacitors
Line 1
Ensure these capacitors are placed as close as possible to the MCU power rail
Cl = 2(Ccap_load - Cstray)
SOLAR POWER INTERFACE
BATTERY CONNECTION
SOLAR PANEL CONNECTION
C20
Capacitance
10uF
VBAT
VUSB
C12
Capacitance
100nF
+3V3
+3V3
+1V1
C3
Capacitance
100nF
VSOLAR
LoRa MODULE
Line 1
Enables long-range wireless LoRaWAN communication.
VSOLAR
C8
Capacitance
1uF
C13
Capacitance
27pF
C10
Capacitance
100nF
TEMP & HUMIDITY CIRCUIT
DECOUPLING CAPACITORS 1.1V
Line 1
Ensure these capacitors are placed as close as possible to the MCU power rail
Pull up resistors
Line 1
R6 and r9 are are pull ups for the SD Card line
Line 2
Line 2
+3V3
+3V3
C25
Capacitance
100nF
C24
Capacitance
10uF
MAIN CONTROLLER
Q1 Disconnects SOLAR input when both SOLAR and USB are connected. NOTE: This is a depletion type mosfet
C16
Capacitance
4.7uF
VBAT
C6
Capacitance
100nF
C9
Capacitance
100nF
+1V1
C4
Capacitance
100nF
C17
Capacitance
10uF
C23
Capacitance
100nF
+3V3
VBAT
VOLTAGE REGULATOR
RF filter capacitors, C27, should be the closest to the microphone
C19
Capacitance
68pF
MOUNTING HOLES
C2
Capacitance
100nF
+3V3
I_ch = (Vset / Rset) * 900 = 900mA
MICROPHONE CIRCUIT
C27
Capacitance
100pF
+3V3
+3V3
C5
Capacitance
100nF
+3V3
SD CARD CIRCUIT
C7
Capacitance
100nF
C18
Capacitance
100nF
+3V3
C26
Capacitance
100nF
USB INTERFACE
C11
Capacitance
1uF
QSPI_SD0
D1
SD_CLK
SD_DATA1
LORA_RX
SD_CLK
MIC_WS
QSPI_SD3
LORA_NRST
QSPI_SCLK
QSPI_SS
SD_DATA3
USB_D-
XOUT
LORA_NRST
SD_DATA0
SD_CMD
SD_DATA2
XIN
~USB_BOOT
QSPI_SS
SD_CMD
QSPI_SD0
MIC_SDA
XIN
DHT_DATA
USB_D+
SD_DATA2
LORA_TX
SD_DATA1
QSPI_SD2
SD_DATA0
XOUT
SD_DATA3
LORA_RX
QSPI_SD1
QSPI_SD1
MIC_WS
USB_D-
DHT_DATA
MIC_SCL
MIC_SDA
QSPI_SD2
QSPI_SCLK
QSPI_SD3
MIC_SCL
LORA_TX
USB_D+
J5
J2
SW1
SW2
J6
J3
L2
Inductance
2.2uH
LED1
Color
Green
Q1
C29
Capacitance
100nF
U5
C15
Capacitance
10uF
C21
Capacitance
100nF
C22
Capacitance
4u7 F
D4
Color
Red
J4
Y1
U3
D5
Color
Green
J1
U6
U2
U4

AvocAudio 04_03 Generating PCB Documentation