The FET circuit: Any alternatives? what do you use?

[tictac]

I've built the FET circuit exactly as the schematics from the WEB. Mine works but it's kinda farts sounding at best.

Does anyone have any alternative circuits that work well? I've thought maybe a minibooster circuit would work well here...

TT

[ayan]

I've built the FET circuit exactly as the schematics from the WEB. Mine works but it's kinda farts sounding at best.

Does anyone have any alternative circuits that work well? I've thought maybe a minibooster circuit would work well here...

TT

Chances are, the FET is improperly biased and you're getting some cut off. Play with different values of the source resistor (Rs) and you will probably get it to sound fine. I suggest perhaps you try a 10K pot, wired are a variable resistor, to get the particular FET properly biased -- then measure the resistance value and subsitute with a fixed Rs.

Gil

[jazzyjoepass]

Gil,


I assume we are biasing to get the maximum output voltage swing without clipping?


And also the 10k pot at the signal out is to balance with the "normal" input levels?


Mike.

[ayan]

Gil,


I assume we are biasing to get the maximum output voltage swing without clipping?


And also the 10k pot at the signal out is to balance with the "normal" input levels?


Mike.

The output trimmer is to... select the output level. I think Dumble set those pretty hot in his amp. I don't like the hiss that results if the output level is too high, so I set it to where it's hotter than the nornal input but not too noisey. Either way, I never use the FET input...

The purpose of the other thing I suggested was to bias the FET right to get it to work properly, which may or may not be "maximum" swing before clipping -- we'd have to ask Dumble what he had in mind -- but to me it certainly means no blocking distortion though.

Cheers,

Gil