Can DC Injection Power Bluetooth Devices?

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Discussion Overview

The discussion revolves around the feasibility of powering Bluetooth devices, specifically exploring the minimum power requirements and the potential use of DC injection from audio outputs. The scope includes technical considerations and practical applications for hobbyists.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the lowest power Bluetooth possible, suggesting a curiosity about minimal power requirements.
  • Another participant questions the necessity of Bluetooth for simple applications, indicating that it may not be user-friendly for hobbyists.
  • A participant speculates whether it is feasible to power Bluetooth with 50mW, expressing interest in low-power solutions.
  • Concerns are raised about powering a Bluetooth transmitter directly from an iPod's headphone output, with one participant stating that the audio waveform is unsuitable for powering active devices.
  • A follow-up question seeks clarification on why the audio waveform is not suitable for powering devices and whether any electrical device could be powered through the headphone socket.
  • Another participant proposes that DC could be injected into the headphone circuit using bypass capacitors to power devices.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of powering Bluetooth devices through unconventional means, with no consensus reached on the practicality of these methods.

Contextual Notes

The discussion includes assumptions about power delivery capabilities and the suitability of audio waveforms, which remain unresolved. The technical feasibility of DC injection into audio circuits is also not fully explored.

ojsimon
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What is the lowest power bluetooth possible?

Thanks
 
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What do you want to do with it? Bluetooth may be overkill for a simple application; it's not terribly easy for a hobbyist to implement.
 
thanks, but just wondering really, would it be possible to power bluetooth with 50mW?
 
Is this related to your other thread?
If you are asking it it would be possible to power a bluetooth transmitter directly from the headphone output of an iPod the answer is no. Even if the iPod could deliver enough power in principle (there are dedicated headphone amps that probably could) that is irrelveant; the waveform (=the music) is not suitable for powering active devices.
 
Thanks yeah they are related, just out of interest why wouldn't the waveform be suitable for powering active devices? so would there be no way of powering any electrical device through the headphone socket?
 
Sure, you could inject DC into the headphone circuit using bypass caps and power something from it.
 

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