AE-237
Week-8-9-10: Vari-Fi
JFET preamp revision C
The wiring diagram for the
Transformerless version of Rev C (input xfrmr included for future reference).
Click on the drawing to download the higher res PDF version...
Your mission (complete
and hand in on Wednesday):
-
Show how the balanced output
signal gets to the TRS output jack
-
Explain what would be heard
if headphones were plugged into this jack. Feel free to redraw
in the space below the schematic.
-
Use the log formula to determine
how many dB the input pad will attentuate. (The fader lab might help.)
-
Use the log, series and parallel
resistance formulas to determine the amount a attenuation when the output
pad is OUT (not engaged) and 32-ohm stereo headphones are connected.
