I doI don't get it.
GoneFrom the white-space at the bottom of the posted image
I am going for low noise amplification, also M1 is now Q2to why M1 eats so much power
Q1 is actually there to provide a definable level of degenerative feedbackto why Q1 works through a low-gain path to stabilize (maybe) the J1-J4 drain voltage
C2 C3 bypassing into that loop produces a better looking high frequency response while working just as well in the low frequency range if it were connected to groundto C2 C3 bypassing into that loop instead of ground
Look at the value of R9, it is just high enough to cause J3 J6 to swing enough to help linearize the OPT performance and does minimalist reduction to output swingto J6 J7 fighting J5 J6 when the load is low-impedance
That is subjective and a tweak was made. Even though I have an affection for brute force circuitry. It has a certain sound to it I think.Or why you need four SK170s to take the wiper of a 50K pot and feed two gates.
not me....I'm just the kid who loves to build great sh*t and share it, I think that was the original reason I joined the forum.someone may be mis-leading their flock
The pot is there as an input trim (input sensitivity control) it is not a miniature 15 turn trimmer as you might believe. This control goes on the front panel.Granted I don't know shit, some things in the schemo do look weird to me. Like the pot going directly to -30V. I'm not sure that's a solid construction. Trim pots blow easily.
Also the 50k pot at the input - I would think that introduces some series resistance and thus noise.
Enter your email address to join: