This is circuit for audio equalizer that is very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. This circuit is like as equalizer bands. Here’s the circuit diagram of the audio equalizer project.
The circuit includes three formula: one which gives f, the centre frequency of the band. The second shows how the Q is related to the capacitor ratio. The third shows the impedance presented by the circuit. Note that this includes 3 terms, the first purely resistive, the second is the capacitive contribution from C1 and the third is an inductive term from the gyrator. The rest of the circuit is simply an op-amp. If you consider a 'tuned circuit' (the gyrator) hanging from the pot slider, it is being connected either to the positive input or the negative to a variable extent. One will increase the response at the turned frequency and the other will decrease it.
The circuit includes three formula: one which gives f, the centre frequency of the band. The second shows how the Q is related to the capacitor ratio. The third shows the impedance presented by the circuit. Note that this includes 3 terms, the first purely resistive, the second is the capacitive contribution from C1 and the third is an inductive term from the gyrator. The rest of the circuit is simply an op-amp. If you consider a 'tuned circuit' (the gyrator) hanging from the pot slider, it is being connected either to the positive input or the negative to a variable extent. One will increase the response at the turned frequency and the other will decrease it.
1 comments:
I'm interested in the idea of combining a graphic equalizer and active crossover: the idea would be to be able to switch the output of each section to go to be summed for low, mid, or high (or however many bands you want), and lead the different sections to separate amplifiers and speakers. Do you see any problems with this idea?
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