Summary of Understand Audio Transducer Basics & Demo - #2 - Sammy Asks pop

00:00:00 - 00:10:00

In this video, Sammy and his guest discuss different types of audio transducers and how they work. They conduct experiments with magnets and coils of wire, showing that by moving a coil of wire near a magnet, it creates electricity and shifts the magnetic field, which is the basic principle behind dynamic speakers and microphones. They also explore the concept of capacitance, where two metal plates act as a capacitor, holding an electrical charge for a short period and preventing low frequencies from passing. They built a circuit to demonstrate the workings of a condenser microphone. The speaker expresses amazement at the discovery of these principles and promises more dissections of speakers in future videos.

• 00:00:00 In this section of the video, the hosts discuss different types of transducers and how sound travels through them. They mention old airplanes having air tubes for sound transmission, which was an acoustical transmission. They also talked about a record player, where the acoustic source gets dug in with a needle and transferred to mechanical energy then back to electrical. Finally, the hosts talked about acoustic-electric-acoustic transfer, exemplified by using a speaker to transfer mechanical energy to electrical, through a wire, and then back to another transducer.
• 00:05:00 In this section, Sammy and his guest explore the basics of audio transducers by conducting experiments with magnets and coils of wire. They find that by moving a coil of wire near a magnet, it creates electricity and shifts the magnetic field, which then creates voltage. This is the basic principle behind all dynamic speakers and microphones. They also test the sound source of a red solo cup by gently wiggling the diaphragm, which produces sound acoustically. It's interesting to note that this is a weird and crappy speaker, but it doesn't need any electrical source to work.
• 00:10:00 In this section, the speaker explains another type of transducer that deals with capacitance, where two metal plates next to each other can act as a capacitor. Capacitors have the ability to hold an electrical charge for a short period of time like a battery and prevent low frequencies, while allowing high frequencies to jump across, which leads to interference. A circuit is built to examine the difference in capacitance as the plates move closer or farther apart from the music vibrations, which is how condenser microphones work. The speaker expresses amazement at the discovery of how to create these different types of transducers and says that more speaker dissections will be featured in future videos.