JFET Amplifier and Filter Project.

Background

A lab was developed with something a little bit more hands on for participants than just blindly doing the NIDA labs. We would benefit from making an N-Channel JFET amplifier and asked if we would be interested. Of course, we weren’t told the JFET type or gain and didn’t know we’d also include a bandpass filter. These parameters we’d have a drawing from which to choose. Finally, we’d have to document and report the entire process in APA format.
Process

Each project is unique and provided on two stapled pages placed upside down in a mixed pile at the front of the room. Each participant was asked to come up and draw their project. I drew project labeled “E” on the upper right corner of the second page. Included were the following: JFET 2N5485 or 2N5458, Gain set to 22, the Bandpass to be 15kHz – 30kHz, and Total Circuit DC Power as Calculated/Measured.
Other resources were...

Over in the Low-distrotion, Audio-range,
Oscillator thread (LINK) some posts
about getting lower distortion before taking
the measurement of a DUT (Device Under Test).

Our own RNMarsh posted some good results
running his Panasonic through a miniDSP
box configured as a Low Pass Filter.

He had good results. So I thought and told him
so, and suggested he might get better results doing a band pass filter.

So instead of doing my diode homework for
my Solid State Devices class, I thought I'd
better check, that is put up for shut up.

So, I did and here is what I discovered:

Before filtering:


https://www.diyaudio.com/forums/attac...r-baseline.jpg...