The circuit was designed to illustrate the use of tone control circuit by which the audio signals are adjusted before being carried out to any output devices such as headphones, speakers, or recording devices through the use of an amplifier.
www.zen22142.zen.co.uk/Circuits/Audio/3band.htm
The add-on circuit presented here is useful for stereo systems. This circuit has provision for connecting stereo outputs from four different sources or channels as inputs and only one of them is selected or connected to the output at any one time.
http://www.electronic-circuits-diagrams.com/audioimages/audiockt1.shtml
The add-on circuit presented here is useful for stereo systems. This circuit has provision for connecting stereo outputs from four different sources or channels as inputs and only one of them is selected or connected to the output at any one time.
http://www.electronic-circuits-diagrams.com/audioimages/audiockt1.shtml
A problem I frequently encounter when copying video tapes is the deterioration in the sound quality. The five band graphic equalizer described here was designed to connect between two video recorders, so that the frequency response can be corrected somewhat.
http://www.web-ee.com/Electronic-Projects/projects/graphic/index.htm
Graphic Equalizer Pro is a professional real-time graphic equalizer for Windows 9x/Me/NT/2000/XP. It will add up to 12 dB of boost or cut at any of 15 bands centered around the International Standards Organization (ISO) 2/3 octave frequencies from 20Hz to 20kHz. This two channel system offers completely independent channel control.
http://headwize.com/projects/showfile.php?file=anwida_prj.htm
Uses a single chip, IC BA3812L, which is a five-point graphic equalizer that has all the required functions integrated onto one IC.
http://www.electronic-circuits-diagrams.com/audioimages/audiockt12.shtml
http://www.4qdtec.com/graph.html
There is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz.
http://www.zen22142.zen.co.uk/Circuits/Audio/3band.htm