Transmitter: https://www.digikey.com/en/products/detail/db-products/USO16A12TLFPM/26005156
MOSFET(s): https://www.digikey.com/en/products/detail/diodes-incorporated/ZVNL120A/152489
Connectors: https://www.digikey.com/en/products/detail/jst-sales-america-inc/S5B-EH/926536
555 timer: https://www.digikey.com/en/products/detail/texas-instruments/NE555P/277057
Capacitors 0.1uF: https://www.digikey.com/en/products/detail/kemet/C320C104K5R5TA/818040
33pF: https://www.digikey.com/en/products/detail/kemet/C315C330K2G5TA/3726026
5kohm: https://www.digikey.com/en/products/detail/vishay-dale/RN55D5001FB14/3336322
500kohm: https://www.digikey.com/en/products/detail/vishay-dale/RN55D5003FB14/3336328
1kohm: https://www.digikey.com/en/products/detail/koa-speer-electronics-inc/CF1-2CT52R102J/13537515
SPST: https://www.digikey.com/en/products/detail/cw-industries/G-105-0513/1333
9V battery holder: https://www.digikey.com/en/products/detail/keystone-electronics/967/2745660
AA battery holder: https://www.digikey.com/en/products/detail/mpd-memory-protection-devices/BC3AAPC/2329365