I'm prototyping a circuit to double the output frequency of a fan tachometer signal, and I've implemented the circuit successfully on a breadboard already. The problem is, when I carefully moved the components over to a perfboard a ton of noise was introduced into the signals. From my experience and from what I've read online, the opposite should be true - there should be more noise on the breadboard implementation than on the perfboard. Has anyone else had this kind of issue? It's a low-frequency circuit (100-300 Hz), but with square waves there may be high-frequency harmonics present.