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Well, I just tried to compile and upload the code for the Arduino Nano and that sure worked fine. But I can't say if it works before I get my...

If I had to guess, I'd probably try something like this. But I'd check the outputs of the signal generator and the amplifier with an oscilloscope and multimeter first. 

@pracdaske Just so you know, the HC-SR04 already has a signal generator and amplifier built in and the pinout doesn't give you access to its TCT40-16T or TCT40-16R. By specification...

Well, the Code might need adjustments to use frequencies closer to 40khz because at 25khz it probably resonates pretty poorly, meaning it is very quiet. More amplicifation might also work,...

It would be very interesting in general, which frequency would perform best for mic jamming. I think I'm gonna order a bunch of different transmitters that can cover more than...

Just got some of the parts I ordered a few weeks ago. I only have a single TCT40-16T at the moment. It works using the 40khz code provided above, but...

Good news! I managed to get it to work without a signal generator. Turns out you can generate the signals using the Arduino directly!  I'll keep my progress on...

I can't recommend this [55hz-30khz](https://www.aliexpress.com/item/32975564335.html) one as it produces a lot of audible noise even when run anywhere between 20-30khz. Because of that I also wasn't successful in finding the...

Sure, but be aware that you can't change how many decibels the output will be. It it's too high it may cause permanent **hearing damage**.  If you want to...

My prototype is okay, but range is somewhat limited. I could of course use an amplifier with more power, but I'm a bit worried about hearing loss because I can't...