NE555P
D3
R5
Resistance
1kΩ
R3
Resistance
10kΩ
R7
Resistance
10kΩ
R6
Resistance
5.6kΩ
MCP4725
C1
Capacitance
10uF
C2
Capacitance
0.1uF
OPA548
Piezeoelectric disk
IRF540