Quantity   Component name
1 × <A href="http://www.sycelectronica.com.ar/semiconductores/CD4520.pdf">CD4520</A> Dual Binary Up Counters (CMOS)
1 × <A href="https://www.jaycar.com.au/medias/sys_master/images/9229013286942/ZC4017-dataSheetMain.pdf">CD4017</A> Decimal Counter (CMOS)
1 × <A href="https://www.jaycar.com.au/medias/sys_master/images/9305894125598/ZC4051-dataSheetMain.pdf">CD4051</A> 8 to 1 Mux-Demux (CMOS)
4 × 3mm LEDs Any type/color
4 × Resistors: 330R - 2.2k The actual value depends on the LEDs used. Limit each channel current to 2.5 mA or less.
1 × Resistor 15k or 20k Pull down the KBD READ line
60 × 6x6 mm dome tactile switches. E.g. <a href="https://ru.aliexpress.com/item/32912263133.html?spm=a2g0o.productlist.0.0.211a58fdWLEFFK&amp;algo_pvid=5e8a18eb-ff77-4f81-86a6-c4cf248f08f9&amp;algo_expid=5e8a18eb-ff77-4f81-86a6-c4cf248f08f9-8&amp;btsid=c43bdf99-bd25-4c45-8015-4ae3946fb30f&amp;ws_ab_test=searchweb0_0,searchweb201602_9,searchweb201603_55">Aliexprass</a>
1 × Pin headers, wiring
1 × 128x64 LCD <a target="_blank" rel="noopener noreferrer" href="https://www.aliexpress.com/item/1420941126.html?spm=a2g0o.productlist.0.0.178515109c0X84&amp;algo_pvid=00a10e02-7c52-4c6e-b868-61439ad4fcc9&amp;algo_expid=00a10e02-7c52-4c6e-b868-61439ad4fcc9-9&amp;btsid=deb10534-57e9-4db7-9eec-a5a9752bee1d&amp;ws_ab_test=searchweb0_0,searchweb201602_7,searchweb201603_52">https://www.aliexpress.com/item/1420941126.html?spm=a2g0o.productlist.0.0.178515109c0X84&amp;algo_pvid=00a10e02-7c52-4c6e-b868-61439ad4fcc9&amp;algo_expid=00a10e02-7c52-4c6e-b868-61439ad4fcc9-9&amp;btsid=deb10534-57e9-4db7-9eec-a5a9752bee1d&amp;ws_ab_test=searchweb0_0,searchweb201602_7,searchweb201603_52</a>
1 × Piezo speaker <a target="_blank" rel="noopener noreferrer" href="https://www.aliexpress.com/item/4000205346153.html?spm=a2g0o.productlist.0.0.7bd576cdHvsdt1&amp;algo_pvid=813236d8-a946-40e4-ab50-5ab91edb3890&amp;algo_expid=813236d8-a946-40e4-ab50-5ab91edb3890-17&amp;btsid=486a3672-75bd-454b-9d35-36379bc34b5d&amp;ws_ab_test=searchweb0_0,searchweb201602_7,searchweb201603_52">https://www.aliexpress.com/item/4000205346153.html?spm=a2g0o.productlist.0.0.7bd576cdHvsdt1&amp;algo_pvid=813236d8-a946-40e4-ab50-5ab91edb3890&amp;algo_expid=813236d8-a946-40e4-ab50-5ab91edb3890-17&amp;btsid=486a3672-75bd-454b-9d35-36379bc34b5d&amp;ws_ab_test=searchweb0_0,searchweb201602_7,searchweb201603_52</a>