DIY Constant-Temp Disinfection Hacks

For individuals seeking a convenient and effective solution for maintaining cleanliness or necessitating disinfection due to professional requirements, a practical approach involves repurposing idle temperature control devices in tandem with hairdryers to construct a reliable constant-temperature disinfection apparatus.

The temperature controller, designed for 12V operation, poses a challenge with its built-in relay power of 120 watts in managing a 1600-watt hairdryer. By leveraging a 5V relay on hand, a modification process is initiated to adapt the temperature controller to a 5V power supply. This entails the removal of the 5V LDO, allowing for direct power supply. The original relay is replaced with two external 5V relays, each featuring a double-pole 5A capacity, collectively enabling a 10A load (2200 watts). This modification ensures a substantial power margin.

Employing a suitable enclosure, a 220V to 5V power supply board is repurposed to internally power both the temperature controller and relays. With a 220V input, the temperature control box orchestrates relay operations, regulating the on/off status of a 220V line. This configuration results in a comprehensive and efficient constant-temperature control system, as depicted in the accompanying diagram.

In situations where a dedicated thermal insulation box is unavailable, a pragmatic approach involves utilizing a small cardboard box housing the hairdryer. A strategically positioned temperature sensor, coupled with a relay set to activate below 60 degrees and deactivate beyond 65 degrees, ensures controlled heating within the cardboard enclosure. This innovative solution has been rigorously tested, confirming precise temperature control within the 60-65 degree range.

To further enhance the disinfection process, consider incorporating an additional thermally insulated foam box, providing an effective solution for disinfecting clothing items, including jackets.