Strictly, it's not a Baxandall; totally different topology.weiss said:I thought about building this baxandall equalizer circuit.
Does it really matter? Is it actually true? What's the "corner frequency" in an EQ? Doesn't it actually depend also on the amount of Boost/Cut?Found it interesting that the corner frequency doesn't change with the cut/boost setting.
THAT1206 is not an opamp; can't be used in this position.weiss said:Alright, i'm also not sure if it makes a difference.. anyway i searched a little more and i'm gonna build this circuit only with stepped frequency selections:
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Now i ask myself, what would be the most useful op amp for this circuit?
Do you guys know what Dangerous uses in their bax?
I got these here..
NE5532
TL072
THAT 1206
LME49270
LM4562
abbey road d enfer said:THAT1206 is not an opamp; can't be used in this position.
All the others can be used; some may disagree, but I think you would be hard pressed to hear a difference between all the others in this configuration.
Thanks for the input, dualflip!Dualflip said:Just go with LM4562 they are 1.60 at mouser, the LM 49720 seems to be the same as the 4562 but more expensive.
weiss said:Alright thank you!
I am just gonna try and see
Quick question, am i correct, for modifying the frequency i gotta change R3 and C2 ?
thank you!
dogears said:C1 and C2
Actually, the HF corner frequency can be altered by changing either R3 and/or C2. However, there's also interaction with the values of R1, R2 and VR1. With the actual values, the HF corner frequency varies with the amount of LF boost/cut.weiss said:Alright thank you!
I am just gonna try and see
Quick question, am i correct, for modifying the frequency i gotta change R3 and C2 ?
thank you!
abbey road d enfer said:Actually, the HF corner frequency can be altered by changing either R3 and/or C2. However, there's also interaction with the values of R1, R2 and VR1. With the actual values, the HF corner frequency varies with the amount of LF boost/cut.
In order to make the shift more predictible, I would increase R3 to about 10k, and scale C2 accordingly.
What do you mean there?weiss said:wouldn't that be the the principle of a baxandall?
abbey road d enfer said:What do you mean there?
Actually there is no set definition of the corner frequency - the usual -3dB point just doesn't work for EQ's- but it is quite possible to determine graphically a pivotal frequency, and it can be shown that it does not vary significantly with the amount of boost/cut, as long as certain constraints are observed. The math analysis is too complex for this thread.weiss said:that the corner freq changes when adjusting gain? i mean, for example increasing gain from 1db to 5db, won't the freq naturally increase then?
By definition, the Baxandall tone control is always active.weiss said:So i wired up my first prototype of the Baxandall Active Tone Control
Then there is something wrong with your circuit.The thing is, with the potentiometers and the switched capacitors i get no change in tone.
The only difference i hear when i take them out of the circuit is that the overall loudness decreases.. ???