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):

1. Show how the balanced output signal gets to the TRS output jack
2. Explain what would be heard if headphones were plugged into this jack.   Feel free to redraw in the space below the schematic.
3. Use the log formula to determine how many dB the input pad will attentuate.  (The fader lab might help.)
4. 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.