Workshop 88 member Jim Williams shared these breadboard photos for our “What’s on Your Breadboard series
This board had a electret microphone with preamp on it, for use in an arduino class that we ran. As you can see, he eventually put the circuit onto a PCB.
The second breadboard shows that sometimes a breadboard is just a convenient way to connect one sensor to an arduino. In this case, it was an ultrasonic rangefinder that Jim wanted to test with the arduino. He reported that it worked well.