Dual voltage consumer appliance oddity

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Discussion Overview

The discussion revolves around a travel hair dryer with a dual voltage selector that appears to be non-functional. Participants explore the implications of this design choice, the operation of the device at different voltages, and the desire for independent control of heat and fan speed settings. The conversation touches on practical applications, modifications, and safety concerns related to the appliance.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant notes that the voltage selector button is not connected to anything, raising questions about its purpose and the implications of using the device at different voltages.
  • Another participant suggests that the speed switch may route current through the fan and heating element in series or parallel, potentially increasing heat and speed when switching from 120V to 240V.
  • Several participants express skepticism about the safety and functionality of using the hair dryer at higher voltages, with concerns about overheating and the operation of safety features.
  • One participant shares their experience with the hair dryer, noting the presence of a diode bridge and the inability to slow down the fan effectively, leading to doubts about modifying the appliance.
  • There is mention of alternative methods for drying pottery, including the use of a propane torch or heat gun, and the challenges associated with these methods compared to a hair dryer.
  • Some participants discuss the potential for hair dryers with independent heat and fan speed settings, speculating on their internal mechanisms and safety features.

Areas of Agreement / Disagreement

Participants express a range of views on the functionality and safety of the hair dryer at different voltages. There is no consensus on the best approach to achieve the desired heat and airflow balance, and multiple competing ideas about the appliance's design and operation remain unresolved.

Contextual Notes

Participants highlight limitations in the available information about the hair dryer, including the lack of detailed user instructions regarding voltage selection and safety mechanisms. There are also unresolved questions about the implications of modifying the appliance.

Who May Find This Useful

This discussion may be of interest to individuals exploring appliance design, safety features in consumer electronics, and those seeking practical solutions for specific heating applications.

  • #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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