Smart Audio Alert Device (SAAD)
This is a senior project from Stony Brook University, which is designed and implemented by Tak-Fung Yip, Franklin Delgado, and consulted by professor Milutin St...
24 bit audio digital to analog converter
This whitepaper is for developers new to TI ARM-based processors, as well as for experienced developers wanting to better understand the various ARM architectur...
Sound Generator
Hello all, I would like to built a sound generator for my Room Monitoring system.Can someone suggest me any electronic design as I would not like to use HT2810 ...
Powering Electret Microphones
I want to power a condenser MIC ( Electret 2 terminals ). I connected a resistance of 1k and capacitance of 10uf to its positive terminal and grounded other te....
electronic volume control
Anyone able to help? The plan is an audio volume control using 40 relay-operated L-pad attenuators per stereo channel. Control is passed in succession to the re...
Low Power Wireless Audio Power Amplifier as baby mointor
This looks like an IR transmitter. IR will not penetrate walls and I assume you mean to use this in a room separate from the room you will be in, so it won`t wo...
Low Cost IC Stereo Receiver
The recent availability of a broad line of truly high-performance consumer integrated circuits makes it possible to construct a high quality, low noise, low dis...
USB Powered Audio Power Amplifier
This circuit of multimedia speakers for PCs has single-chip-based design, low-voltage power supply, compatibility with USB power, easy heat-sinking, low c.....
Twin-T RC Notch Filter
The two T-notch filter can be used to block unwanted frequencies or if placed in an op amp as a bandpass filter. the notch frequency occurs where the capa.....
TV Muter Circuit
Many households are still graced by tube-type television sets. If you want to connect one of these large tellies to your stereo system to improve the soun.....
Test Beeper For Your Stereo
The test beeper generates a sinusoidal signal with a frequency of 1,000 Hz, a common test frequency for audio amplifiers. It consists of a classical Wien-.....
Ten-Band Equalizer
The equalizer presented in this article is suitable for use with hi-fi installations, public-address systems. mixers and electronic musical instruments. T.....
Stepped Volume Control
Louder music, sirens or speech in response to higher ambient noise levels? This simple circuit has the answer, and it may enable your robot to be at least.....
Simplest Intercom
This circuit was requested by an school teacher. It is a simple intercom that anyone can put together and get to work. It is based on the LM380 IC chip. T.....
Simple Stereo VU Meter
This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it...
Simple Audio Peak Detector
This audio peak detector allows a pair of stereo channels to be monitored on a single LED. Identical circuitry is used in the left and right channels. Use.....
push button relay selector
This circuit was designed for use in a hifi showroom, where a choice of speakers could be connected to a stereo amplifier for comparative purposes. It cou.....
Preamp Stage For Ceramic Phono Cartridge Or Violin Pickups
While we have published a number of variations on a standard RIAA preamplifier for magnetic phono cartridges, we have not published a preamp stage for cer.....
Portable Microphone Preamplifier
This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the in...
Polyphonic DoorBell
An AC triggered Multitone, polyphonic doorbell. It gives eight melodious tunes for 2 minutes. On each press it will give a new tone which will continue till the...