Dragonfly JFET Boost

[sevenisthenumber]

I built up the super simple
I love it! It has a nice bite! How could one simply adjust some of the upper frequencies?
Tanks!

[petemoore]

  SWTC

[sevenisthenumber]

i thought that but was wondering if a simple resistor adjustment might let me change the highs/lws.

[compuwade]

I believe C2 will change the boosted frequency. I'm not sure how the rest of the circuit will react to it though.

[CynicalMan]

I believe C2 will change the boosted frequency. I'm not sure how the rest of the circuit will react to it though.

At 10u, this circuit is boosting all audio frequencies equally. Increasing its value wouldn't do anything and reducing it would reduce bass. A way of reducing treble would be to add a capacitor from the gate to ground.

[John Lyons]

Yes, with the same parts count there is only a way to decrease bass.
Make C2 smaller and you increase the treble boost.

With more parts
Put a 10K resistor after C1 and a .002 cap to ground and
take the output off the junction or the two and to the volume
control and you'll cut a little high end.
Adjust the resistor larger and you'll cur more highs.
Make the cap bigger and you'll change the freqs cut (slope).

John

[Der Groovemeister]

Better build his Sparkle boost. That sounds awesome! It is unimprovable.