Works well, good instructions, case is a bit fiddly
For Bat Listener
It came to me in a reasonable amount of time for UK to Canada. Kit was well organized, may be a bit advanced for a absolute beginner. Built it in a couple of hours (I check all parts as I install them). I ended up with 2 extra 16 pin DIP sockets so thanks I guess. The case presented a bit of a challenge, a little awkward to assemble and I didn't realize there were different screw lengths (10 and 12mm). Two 12mm together would come up against each other and not allow the top/bottom to tighten up properly. Double checked the instructions and the parts list said 6 and 12mm screws, that would have been easier to notice (I was anxious to finish it). My store brand 9V batteries are bit thicker than they should be so I shimmed up the cover with small flat washers so the top wouldn't distort. I found the speaker a bit on he loud side (no volume control) so I replaced it with a 3.5mm jack. I then made a new speaker with the guts from an old earbud and soldered it directly to a 3.5mm mono plug (no shell). I covered it with a piece of heat shrink as it was still to loud and that seems to be better. I may add a volume control when I can get time to come back to it (Canadian winter). Volume was an issue because I like to crack open my bedroom window and just leave it on over night to get an idea of how many bats may be around my house. It worked great I can hear them coming and going and it doesn't wake me up now. I am currently in the scheming stage of hooking it up to a Raspberry Pi to get time stamps and pulse patterns for next year and maybe remote the sensor (Canadian winter). Maybe I'll even be able to identify individuals. Overall it's a fun project that connects you to the real though un-hearable world of ultrasonics.
Tip: I use plastic ice cube trays to organize parts before assembly. Helps assembly to go faster.
