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Schematics.com | DIY Parametric Equalizer
https://www.schematics.com/project/diy-parametric-equalizer-55855/
Parametric Equalizer is an electronic multi-band variable equalizer device used in sound recording and live sound production. This devices allow audio engineers to control the parameters of the internal band-pass filter sections. The …
Parametric Audio Equalizer - Damien Douxchamps' Website
https://damien.douxchamps.net/elec/param_eq/
A parametric equaliser is much more versatile, with 3 controls per band: the gain, the frequency and the bandwidth. This allows the parametric equaliser to get away with using only a few bands, typically two or three. A good parametric equalizer …
Parametric EQ - Elliott Sound Products - The Audio Pages ...
https://sound-au.com/project150.htm
This circuit is the 'heart' of nearly all audio oscillators (not function generators - they are very different). In an oscillator, an amplifier circuit is used to provide positive feedback around the Wien bridge, and the negative feedback path needs gain stabilisation to provide a gain of 3, which is just enough to sustain oscillation.
Audio Filters: Designing an audio equalizer – Part 7
https://www.engineersgarage.com/audio-filters-designing-an-audio-equalizer-7-8/
Equalizers can be designed using audio filters or integrated chips (such as an LA-3600, which is a five-band equalizer IC). For this project, we’ll design a three-band, graphic equalizer circuit using audio filters. So, it will have low, high, and band-pass filter circuits to separate the low, high, and mid-range frequencies of the audio signal.
Middle Frequency Equalizer with Parametric Feature
https://www.eeweb.com/middle-frequency-equalizer-with-parametric-feature/
The circuit is comprised of two parts having a typical bass and treble circuit and a parametric circuit of mid frequencies. The circuit of the equalizer will take an audio output, and manually boosting or attenuating the amplitude by adjusting the two channels consisting of the bass with 20 HZ to 1 KHz and the treble with 1 KHz to 20 KHz.
3-band parametric EQ - SabroTone
https://www.sabrotone.com/3-band-parametric-eq/
The equation being f= 1/(2*pi*(SQRT R1*R2*C1*C2)) Where r1 is the 470ohm and R2 is either end of the potentiometers, meaning 51k and 1.05M including the 51k resistor. If you leave C1 and C2 as nF they give quite outrageous values but when adjusted to pF they give realistic frequency values.
Gyraf Audio - DIY Calrec EQ
https://www.gyraf.dk/gy_pd/calreq/calrec.htm
The Circuit: The Schematic for the original PQ1549 EQ section. The Redrawn Schematic for our version of the PQ1549. The Calrec PQ1549: The Calrec PQ1549 is a classic no-nonsense parametric equalizer from the famous (and huge!) Calrec "Polar" desk, that were only manufactured in very small numbers.
Serial driven parametric equalizer | diyAudio
https://www.diyaudio.com/community/threads/serial-driven-parametric-equalizer.364738/
I'm looking how to achieve parametric EQ driven by serial commands (issued by an Arduino). I wouldn't like to process the audio in the Arduino because I want it real time and high quality, something that I think, Arduino can't perform. At this time, I know the TDA7317 for graphical EQ with serial commands but it is not parametric.
Symetrix se400 dual parametric equalizer schematic - Music ...
https://music-electronics-forum.com/forum/amplification/guitar-amps/maintenance-troubleshooting-repair/928459-symetrix-se400-dual-parametric-equalizer-schematic
Symetrix se400 dual parametric equalizer schematic 04-07-2021, 10:15 PM I bought this Symetric SE400 Dual Parametric EQ back in 2003 (on ebay for $102) when the core of my band reformed for a few years to take another crack at putting some tunes together and doing an album, this time produced by ourselves.
An audio circuit collection, Part 3 - Texas Instruments
https://www.ti.com/lit/an/slyt134/slyt134.pdf
the Q of a 2-octave equalizer should be 0.85, and that of a 1⁄ 3-octave equalizer should be 5.1. The response of an equalizer stage with these Q values is shown in Figure 7. A filter with a Q of 1.7 (Figure 7) will have a bandwidth that is 1/1.7, or 0.588 of the center frequency. Thus, the 1000-Hz filter with a Q of 1.7 has a bandwidth of 588 Hz.
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