Absolutely no need for luck!
From your link:
https://tonestack.yuriturov.com/
You can put values for source Rin (i.e. output imedance of the previous stage) and Rload in the calculator.
From your link:
https://tonestack.yuriturov.com/
You can put values for source Rin (i.e. output imedance of the previous stage) and Rload in the calculator.
What do you mean i did not specify the circuit i tried. I posted circuit schematics in post #6 and #16.
I do not intend to use passive circuit right before the headphones. I intend to use passive circuit before headphone amplifier. I wrote this already.
We do not seems to understand each other, not sure i should post here anymore. Just last post.
Last edited:
Partial success with loudness from yamaha. Well, its not exactly centered where i want, but i used 20k linear pot, because i did not have lin 10k.
First i measured with right mark audio software without readjusting the level, but as passive loudness works, it decreases midrange, so eventually right mark failed as 1kHz tone it uses for calibration was too low.
Remeasured with readjusting volume similar at 1kHz.
First i measured with right mark audio software without readjusting the level, but as passive loudness works, it decreases midrange, so eventually right mark failed as 1kHz tone it uses for calibration was too low.
Remeasured with readjusting volume similar at 1kHz.
Attachments
It will work, if output load is high impedance - 1 Mohm preferably. Input impedance of (phone) amplifiers usually are much lower.
Of course tone controls work only in negative - it is passive circuit.
Well, loudness works in negative too, by supressing midrange, it boosts lows and highs.
So its a matter of semantics.
So its a matter of semantics.
Yes, that is correct.
Just bear in mind that most (or all - I didn't look at all of them) of the circuits here need high impedance load to work properly.
Yes, i am aware of high impedance requirement, i can easily put jfet buffer after with few hundred Mohm.
Got many b1 buffers in drawers, plus ton of hamptones, jfet pre.
Got many b1 buffers in drawers, plus ton of hamptones, jfet pre.
Not sure it classifies as passive circuit when its part of negative feedback from output to gate.
I still have not found dual linear 10k pot. Will have to order it.
However, while i searched through bags and boxes of parts, i found sliding volume pots of 22k and 47k with three, yes, three taps!
This should make seriously good approximation to loudness contour.
Anybody got values for such volume with three taps?
However, while i searched through bags and boxes of parts, i found sliding volume pots of 22k and 47k with three, yes, three taps!
This should make seriously good approximation to loudness contour.
Anybody got values for such volume with three taps?
No. L. V. Viddeleer worked for the PTT, the then Dutch post, telegraph and telephone office. As far as I know, this tone control was just a hobby circuit of his. It's off topic because it isn't passive, but it has the control characteristics adason prefers, which is why I posted it anyway.
Last edited:
