Quantity   Component name
1 × TI SN74LS138N - 4 Input NAND gate Schmitt Trigger <a target="_blank" rel="noopener noreferrer" href="https://lcsc.com/product-detail/Others_Texas-Instruments-TI-SN74LS138N_C352964.html">https://lcsc.com/product-detail/Others_Texas-Instruments-TI-SN74LS138N_C352964.html</a>
1 × LM386 –Audio Amplifier <a target="_blank" rel="noopener noreferrer" href="https://lcsc.com/product-detail/Audio-Power-OpAmps_Unisonic-Tech-LM386L-D08-T_C87306.html">https://lcsc.com/product-detail/Audio-Power-OpAmps_Unisonic-Tech-LM386L-D08-T_C87306.html</a>
1 × LM7805 <a target="_blank" rel="noopener noreferrer" href="https://lcsc.com/product-detail/Linear-Voltage-Regulators_STMicroelectronics_L7805CV-DG_L7805CV-DGThick-heat-sink_C3795.html">https://lcsc.com/product-detail/Linear-Voltage-Regulators_STMicroelectronics_L7805CV-DG_L7805CV-DGThick-heat-sink_C3795.html</a>
1 × Speaker (Optional for testing only) <a target="_blank" rel="noopener noreferrer" href="https://lcsc.com/product-detail/Linear-Voltage-Regulators_STMicroelectronics_L7805CV-DG_L7805CV-DGThick-heat-sink_C3795.html">https://lcsc.com/product-detail/Linear-Voltage-Regulators_STMicroelectronics_L7805CV-DG_L7805CV-DGThick-heat-sink_C3795.html</a>
1 × Capacitors <a target="_blank" rel="noopener noreferrer" href="https://lcsc.com/products/Ceramic-Disc-Capacitors_430.html">https://lcsc.com/products/Ceramic-Disc-Capacitors_430.html</a>