Dual voltage consumer appliance oddity

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SUMMARY

The discussion centers on a dual voltage travel hair dryer, specifically the Conair model 124TLN, which features a non-functional voltage selector switch. Users express confusion over the switch's presence and its implications for performance at different voltages. The hair dryer operates at 120V AC with a safety plug, and the user manual indicates that only the low speed setting is available at 250V. Participants suggest that modifying the dryer for independent heat and fan speed control is impractical and recommend alternatives like heat guns for specific applications.

PREREQUISITES
  • Understanding of AC voltage systems, specifically 120V and 240V
  • Familiarity with hair dryer mechanics and electrical components
  • Knowledge of safety devices like GFCI plugs
  • Basic electronics knowledge, including diode bridge arrangements
NEXT STEPS
  • Research the electrical specifications and safety features of the Conair 124TLN hair dryer
  • Explore the functionality and design of heat guns for controlled heating applications
  • Investigate the implications of using dual voltage appliances in different regions
  • Learn about modifying electrical appliances safely and effectively
USEFUL FOR

Individuals interested in appliance design, electrical safety, and those seeking alternatives for heat application in crafts or hair styling. This discussion is particularly relevant for electrical engineers, DIY enthusiasts, and consumers evaluating travel appliances.

  • #31
I finally got around to finishing my hair dryer project. After completing the modifications I put it back together and discovered that what I had originally concluded about the "dummy" voltage select switch isn't exactly correct. The voltage switch *does* have a function. While it has no direct electrical connection it has a small plastic slot that interlocks with a plastic tab on the main speed/heat switch. This interlock prevents one from selecting both 250V and HIGH simultaneously. FWIW.
 
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  • #32
Rive said:
I think there must be some other, more proper ways to run a 12V DC motor from 120V AC mains... o_O

Maybe. Like what? The original design is the motor (with a full wave rectifier) in series with a resistor. I just wanted a bigger resistor.
 

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