1/28/2024 0 Comments Audio spy bugsAssemblyĭownload the EAGLE Light (free) version to visualize the board layout or refer to the board screenshot here. Pay, wait until delivery and you are good to go. Find all the parts as explained in the Youtube video. brd file, choose 0.8mm 2oz, pay and wait until it's delivered.ĭownload the BOM from the google drive folder and go to. Then go to and upload the gerber.zip or. This can be cumbersome but up to 433MHz is certainly doable.įirst you need the PCB. If any modifications are done, like board thickness or copper trace thickness or even the SAW frequency the inductor value will need to be readjusted. ![]() The microphone is good for 1.45V only though so you would need to find a way to protect it. Power could even be further increase by increasing the power supply voltage to let's say 3V. Current will increase accordingly though, from 1mA with 620 Ohm to a couple of mA with lower R1 value. Power output can be increased dramatically if R1 is lowered, I tested it down to a 100 Ohm or so a while ago. ![]() The parts are almost all 0201 packages for the passive components, they are much easier to assemble than the ones from my first instructable that used 01005 packages. Keep in mind that in order for the circuit to be as small as possible the component count had to be kept as low as possible too, so what you see here is really the bare minimum needed for the intended purpose. The oscillator to the right is basically a simple SAW based oscillator that's being "disturbed" by our low frequency audio signal. To the left is the microphone, the audio signal is capacitively coupled to a very simple amplifier stage and then goes to a varactor diode that modulates the HF oscillator. First make sure you have the following tools/materials:Īll the other parts are in the BOM you can find here:Įxplaining the attached PDF schematic (see below):
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