Articles - Audio

Typical circuit An ongoing project (or gadget) called for a means of generating an audio output to represent a varying voltage level. Ho hum: that sounds like a voltage-controlled oscillator. But this signal was bipolar, spanning peaks ranging from ...

Modern day recording and broadcast is a mixed bag for today's audio engineers when it comes to input signal chains. Microphone electronic technology really hasn't changed that much over the last 50 years. The concept is mostly based around ...

If you need a very pure sine wave in the audio range, the circuit in Figure 1 can help. It is a simple deal: A sine wave with a THD of 1% coming from a function generator that goes through a trackable low-pass filter, which attenuates the ...

The utilization of Micro-Electro-Mechanical Systems (MEMS) microphones presents an opportunity to incorporate sophisticated communication and monitoring capabilities into a diverse range of devices. Home digital assistants and voice-enabled ...

This article describes a technique to compensate the DC voltage drift in the output of a directly-coupled AB-Class audio power amplifier. The main benefit of a directly-coupled output is improved bass response. Since the design eliminates the ...

A Zobel network is useful in making a reactive load appear as a pure resistance to a driving source prone to stability problems ( Reference 1 ). A typical situation is an audio power amplifier driving a loudspeaker, modeled at first approximation ...

Audio amplifiers for high-power portable speakers such as trolley speakers usually operate with lithium-ion batteries, and these batteries can vary from a single cell to a few cells in series. Designers generally use boost converters to produce the ...

As a youngster, I saw some really old radios; the kind that occupied highly-polished wooden cabinets the size of a refrigerator. When those old radios were made, permanent magnets were not all that powerful, at least by today’s standards, and ...

There was an interesting article in the January 1961 issue of Popular Electronics, “Sweet Sixteen” by Jim Kyle. It was followed up in April 1961 with a second article entitled “Sweeter With A Tweeter.” You can find some ...

Rien Oortgiesen, Jens Tybo Jensen, Infineon Technologies Part 1 3.2 Benefits of multilevel class D The benefits of innovative multilevel class D amplifiers include: Smaller solution size and lower cost with less reliance on filters Improved ...