• 1 x resistor 10K thruhole
• 1 x resistor 10M thruhole
• 1 x diode BA159 or alternative
• 1 x piezo disk ~3.5Khz (datasheet)
• 1 x BLUE led (3.5v fwd voltagedatasheet)
• 1 x LM741 opAmpo (datasheet)
• 2 x coin cell battery CR2032

• QA about simulation
• piezo_maruta-p37e.pdf
• Modeling of Piezoelectric and Acoustic Elements with LTspice\SwCad and mirror (PDF)
• THE RLC CIRCUIT MODEL FOR A PIEZOELECTRIC TRANSDUCER and mirror (PDF)

github