Hi AAC -
I have been making my way through AN-72, "The LM3900: A New Current-Differencing Quad of Plus or Minus Input Amplifiers." (http://www.ti.com/lit/an/snoa653/snoa653.pdf). I'm breadboarding different circuits to learn about the chip. It's still a little mysterious to me, though an I can't get some of the circuits to work at all.
Most importantly to me, though, is Figure 42 - "the Squarewave Generator." It doesn't seem to be easily tunable. I'm not sure I understand why. Can anyone shed some light on this particular subject?
I have been making my way through AN-72, "The LM3900: A New Current-Differencing Quad of Plus or Minus Input Amplifiers." (http://www.ti.com/lit/an/snoa653/snoa653.pdf). I'm breadboarding different circuits to learn about the chip. It's still a little mysterious to me, though an I can't get some of the circuits to work at all.
Most importantly to me, though, is Figure 42 - "the Squarewave Generator." It doesn't seem to be easily tunable. I'm not sure I understand why. Can anyone shed some light on this particular subject?