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  • PaulA23 commented on rachesv99's instructable Bluetooth Headphones Conversion1 month ago
    Bluetooth Headphones Conversion

    I was in the US NAVY for several years as an Aviation Electronics Tech, but I can promise you that I've learned more from "learn as you build" than any electronics teaching I've ever had!! :-)I've converted several old headphones to Bluetooth - in fact, many friends & family laugh because I'm always saying "hey, let's put Bluetooth on it" almost every time I see something electronic, lol! The charging port & amplification issues are valid concerns (mainly due to charging polarity & speaker impedance), but let's face it: if the speakers or electronics get fried, then you've already gained more in knowledge & experience than the ~$10 cost of the project. :-)If you do version 2, I suggest using the internals of a Bluetooth speaker instead of the hands-f...see more »I was in the US NAVY for several years as an Aviation Electronics Tech, but I can promise you that I've learned more from "learn as you build" than any electronics teaching I've ever had!! :-)I've converted several old headphones to Bluetooth - in fact, many friends & family laugh because I'm always saying "hey, let's put Bluetooth on it" almost every time I see something electronic, lol! The charging port & amplification issues are valid concerns (mainly due to charging polarity & speaker impedance), but let's face it: if the speakers or electronics get fried, then you've already gained more in knowledge & experience than the ~$10 cost of the project. :-)If you do version 2, I suggest using the internals of a Bluetooth speaker instead of the hands-free kit. The electronics are still fairly small, but give you a better amplification circuit for the impedance (resistance) of your headphone speakers. Most cheap ones combine left & right into a single channel, but it's fine for headphones, & you can buy them for $10 USD new @ Big Lots & WalMart (or your local "super" store). As for charging port, you can use a small audio jack, then re-use the old headphone cord as the charging cord - USB 2.0 charging spec is only 2.5 Watts (500mA @ 5Volts). :-)Excellent job - you made your idea a reality, & that's what matters!! :-)

    Most headphone speakers are more on the order of 16->32 Ohms, so lack of volume would be more prevalent than distortion (overdrive). However, the high impedance could definitely cause the preamp to lose its magical blue smoke if the input signal is driven too high, but since it's an isolated, self-supplying circuit (not hardwired line in, but 2.4GHz carrier + audio signals decoded to "line in"), that's unlikely to be an issue here. :-)Hopefully I can get my synchronized Bluetooth surround sound speakers working soon - synchronizing the signals is HARD... :-)

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