> There’s an old electronics joke that if you want to build an oscillator, you should try building an amplifier The most easy way to annoy a neighbor using AM

> There’s an old electronics joke that if you want to build an oscillator, you should try building an amplifier The most easy way to annoy a neighbor using AM radios, it's using a regenerative AM receptor with too high gain. Could oscillate and begin to emit noise at the same freq that are you tuning. Adding a simple carbon microphone to it, and setting the gain to the max, was a very easy way of building a AM radio emitter.