Quantity   Component name
1 × 24V 4A Power Supply $17: AC 110-240V to DC 24V 96W https://www.amazon.com/dp/B07K1734CM?psc=1&ref=ppx_yo2_dt_b_product_details
1 × Arduino Nano $5
1 × .91" OLED I2C Display $4: https://www.amazon.com/dp/B079BN2J8V?psc=1&ref=ppx_yo2_dt_b_product_details
1 × IRF540N MOSFET $0.80: https://www.amazon.com/Bridgold-IRF540-IRF540N-Transistor-Channel/dp/B07PH6FPZR/ref=sr_1_3?keywords=IRF540N&qid=1638975285&sr=8-3
1 × MP1584EN DC-DC Buck Converter Adjustable Power Supply Module $1.67: https://www.amazon.com/gp/product/B01MQGMOKI/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
1 × MCP14E7 MOSFET Driver (Could use cheaper transistor or FET instead) $2.20: https://www.digikey.com/en/products/detail/microchip-technology/MCP14E7-E-SN/2664962
1 × Potentiometer (2K Ohm, 10K Ohm, etc) $1-$2: I am reusing a the 500K Ohm pot from the old soldering station
1 × 24VDC Rated Power Switch $2: I am reusing the switch from the old soldering station
1 × LM358 OpAmp $0.57: https://www.aliexpress.com/item/1005003429340261.html?spm=a2g0o.search0304.0.0.150f725b5N79CJ&algo_pvid=cce68a18-2fc6-4a9f-b799-e30c44f30b0d&aem_p4p_detail=20211222073114969488673180650005918182&algo_exp_id=cce68a18-2fc6-4a9f-b799-e30c44f30b0d-3