Adjustable power adapter

https://www.lazada.com.my/products/9-24v-3a-anti-interference-power-adapter-supply-acdc-adjustable-power-adapter-i349388325-s491745298.html?spm=a2o4k.searchlist.list.1.396f3e28wumLkm&search=1

DIY Oscilloscopes and Signal Generators

https://www.lazada.com.my/products/xr2206-function-signal-generator-diy-kit-sinetrianglesquare-output-1hz-1mhz-signal-generator-adjustable-frequency-amplitude-i476088384-s782256883.html?spm=a2o4k.seller.list.15.285e4dd1ADEFOS&mp=1

https://www.lazada.com.my/products/original-jyetech-13805k-dso138mini-diy-digital-oscilloscope-kit-smd-pre-soldered-200khz-35v-6v-dc-i445094457-s662912125.html?spm=a2o4k.searchlist.list.43.2ded6894GE5Tnc&search=1

https://www.youtube.com/watch?v=RapnTtLNI1Y

https://www.youtube.com/watch?v=QLvEJYMgHWU

https://www.lazada.com.my/products/jye-tech-dso-shelldso150-24-tft-handheld-pocket-size-digital-oscilloscope-with-housing-clip-probe-1msas-0-200khz-i315079647-s431277300.html?spm=a2o4k.searchlist.list.13.58fe3af3I7mcML&search=1

PC based Oscilloscope
https://www.youtube.com/results?search_query=Hantek+PC+Based+USB+Digital+Storage+Oscilloscope+6022BE