Post by asmith on Jan 5, 2012 17:45:29 GMT -5
This is a rambing history on some youthfully hotheaded experiments with JohnH's BlueJuice, attempting to model in a fader control between the natural treble-boost, and the mid-boost.
Back story
I modelled up JohnH's new BlueJuice, and added a plain-ol' RL tone control in series with the cap, to see what a potential 'treble boost / mid boost' fader might work like.
Values of just 50-100mH (that's mili, not micro) and a 5k pot gave some really exciting results on the "Gain" graph, with the circuit gain at full whack. Here's 5k and 100mH.
Then I tempered my mid-boost fever, and did the sensible thing. I modelled up a pickup connected to the circuit. Here you can see the RL tone control as well.
Let's check the gain control on that one from 90-100%, which, as John noted in the BlueJuice thread, is the last half-turn of the pot.
Then I tried the added treble/mid fader.
Funky. But, with the gain at just 95%, the mid/treble fader did this.
Where I am so far
After a little further experimentation, I modeled this, using another dual-gang pot:
And it works a treat. Here's the mid control sweep at full gain:
And here's the mid control sweep at 95% gain.
Mid-boost-erific!
I'm going to do some more experimentation with inductor values. I think L1 could be smaller, to give more of a 'mid' peak instead of a 'bass' peak. And I may add a static resistor between L1 and the "Ooh" pot, so that that mid-boost isn't so dramatic at 95% and gives a more even response whatever the gain is.As you can see, at 'full' crunch you lose about 10dB of gain on the control, so this may not be for everybody.
Any way you look at it, the entire thing should be switchable in and out of the circuit with just a single-throw double-pole switch. So I'll add that in when I build it to jump between mid-fader on and mid-fader off, and of course post results.
EDIT:
Actually, the best results seem to come from the simplest layout. Detach R16 from the ground rail, and connect it to the wiper of a linear pot. One one lug, wire an inductor of the same value (100mH) to ground, and on the other lug, another cap of small value. Instant fader.
I just did a quick test on this and the results look good to begin with. More tomorrow. I'm falling asleep at the keyboawerjgoepgjm
Back story
I modelled up JohnH's new BlueJuice, and added a plain-ol' RL tone control in series with the cap, to see what a potential 'treble boost / mid boost' fader might work like.
Values of just 50-100mH (that's mili, not micro) and a 5k pot gave some really exciting results on the "Gain" graph, with the circuit gain at full whack. Here's 5k and 100mH.
Then I tempered my mid-boost fever, and did the sensible thing. I modelled up a pickup connected to the circuit. Here you can see the RL tone control as well.
Let's check the gain control on that one from 90-100%, which, as John noted in the BlueJuice thread, is the last half-turn of the pot.
Then I tried the added treble/mid fader.
Funky. But, with the gain at just 95%, the mid/treble fader did this.
Where I am so far
After a little further experimentation, I modeled this, using another dual-gang pot:
And it works a treat. Here's the mid control sweep at full gain:
And here's the mid control sweep at 95% gain.
Mid-boost-erific!
I'm going to do some more experimentation with inductor values. I think L1 could be smaller, to give more of a 'mid' peak instead of a 'bass' peak. And I may add a static resistor between L1 and the "Ooh" pot, so that that mid-boost isn't so dramatic at 95% and gives a more even response whatever the gain is.As you can see, at 'full' crunch you lose about 10dB of gain on the control, so this may not be for everybody.
Any way you look at it, the entire thing should be switchable in and out of the circuit with just a single-throw double-pole switch. So I'll add that in when I build it to jump between mid-fader on and mid-fader off, and of course post results.
EDIT:
Actually, the best results seem to come from the simplest layout. Detach R16 from the ground rail, and connect it to the wiper of a linear pot. One one lug, wire an inductor of the same value (100mH) to ground, and on the other lug, another cap of small value. Instant fader.
I just did a quick test on this and the results look good to begin with. More tomorrow. I'm falling asleep at the keyboawerjgoepgjm
