![]() I am using a 5 V AC adapter (that I pulled out of a junk pile and tested with a volt meter) which can be used to power the transmitter crystal as well as the Bluetooth module. The datatsheet for my specific crystal oscillator says it operates at 5 V plus or minus 10%. However, I have read that much more than 6 volts is not good for the crystal. As far as the crystal transmitter is concerned it seems that anything from about 3 V to 9 V will work. Therefore, I assume that it is a standard 3.7 V battery. In my case, my Bluetooth speaker had a small battery connected to it. Pin 14 (top left corner) connects to one of the wires on the high side of the transformer-the other lead on the transformer connects to the positive 5 V of the power supply.įor testing purposes, you can power the Bluetooth module and the transmitter separately.You can add a longer wire later if necessary. To get started I just hooked a 10" (25 cm) piece of wire to this pin. Pin 8 (top right corner) goes to the antenna. ![]() But you could also use 4-AA batteries (or a 9 V battery, but that may not be the best choice as you will see later). In my case it is the ground from a 5 V AC to DC power supply.
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