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Loudspeaker as vibration sensor

Big earthquakes are rare events, but every now and then we are startled by small shocks that (luckily!) do not usually have any serious consequences. With the circuit described here and a PC you can very easily keep an eye on all earthquakes.
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Gerber file



Component list
R1,R6 = 1MΩ
R2,R5 = 100kΩ
R3,R13 = 22kΩ
R4 = 220kΩ
R7,R12 = 4MΩ7
R8 = 15kΩ
R9,R11 = 47kΩ
R10 = 10kΩ
C1,C14 = 10µF 25V radial
C2,C12,C13 = 220 µF 25V radial
C3 = 2F2
C4 = 15nF
C5 = 220nF
C6 = 4F7
C7,C8 = 22pF
C9,C16 = 1nF
C10 = 470nF
C11,C15 = 4F7 25V radial
C17-C21 = 100nF
D1,D2 = 1N4148
IC1 = LP2950CZ-5.0
IC2 = MAX7400CPA
IC3 = ATtiny45 (programmed, order code 060307-41)
IC4 = TL081ACN
IC5 = TL082CN
IC6 = LT1175CN8-5
X1 = 4MHz quartz crystal
PCB, ref. 060307-1 from www.thePCBShop.com
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