These adapters allow you to stream your favorite tunes, podcasts, and audiobooks without using any cords or having to replace the dashboard entertainment systems you already have in place.
If you are having issues with soldering these wires like I did, try burning off the internal insulation (it's usually colored) with a lighter.If your car or favorite vintage boombox is outfitted with a cassette player, the best Bluetooth cassette adapters can turn a cassette player into a Bluetooth speaker with this one handy device - as you shop, you’ll need to consider the system you’ll be using the adapter with and any specific audio features you might need. I used the 1/8" (3.5mm) jack from the cassette adaptor to solder all these together (see picture 8). Once your components are selected, time to solder and heatshrink (see pictures 4, 5, & 6). However if you notice that you are losing bass response, raise the value of the cap and you should be fine. The 10 ♟ capacitor will create a high pass filter. After trying it out, it's more than loud enough for me. With my 22Ω resistor it only lowered it to around 0.35v p-p (see picture 3). The normal output of my preamp is around 0.4v p-p (see picture 2). I ended up dropping it down to the 22Ω as previously stated. I started with the 2.2KΩ as previously mentioned, however, that attenuated the signal far too much. The amplitude of the two signals need to be as close as possible while having some sort of resistive isolation.Īfter testing I selected 22Ω resistors with 10 ♟ capacitors. Run your function generator through your bluetooth adaptor then through your cassette adaptor (I did this so that my signal would have the same amplitude coming from the Bluetooth adaptor).Ĭompare your output from your input on your oscilloscope. That is a great starting point (see picture 1).
In order to test what values are needed, check what resistors are coming from your cassette preamp. There needs to be some value of resistive isolation coming from the adaptor, as well as DC isolation. Once the wires have been soldered in place, it's time to determine what value of components are needed.
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