[sdiy] Overdriving 4069UB

[Harry Bissell Jr]

Seb Francis <seb at burnit.co.uk> wrote:  Hi Harry,

This is the current circuit:
http://burnit.co.uk/sdiy/stuff/mosfet_distortion.gif


Yep, that's right - with a 1uF cap before the 10K resistor.  I 
experimented with also adding DC bias to the CMOS input to make the 
distortion more symmetrical, but I found that it didn't make much 
difference.

It would not make a difference. The circuit will self bias to the crossover
  point between the N and P transistors because of the feedback resistor.
  
  Kind of cool, that....
  
  H^) harry

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