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Op Amp Based FM Transmitter - An low power FM Transmitter using an op-amp as the
audio preamp and a single transistor as the RF amplifier… [Designed by Kamran Ahmed]
Op Amp Comparator with Hysteresis - The challenge sounds simple
enough, take a 60 Hz (or 50 Hz) sinewave from the AC power line and
convert it to a square wave. This signal will serve as a clock to drive
counters for a 24 hour time clock. So you hook up an op amp as a
comparator to do the job. But your surprised to see the clock running too
fast! With oscilloscope in hand you discover the AC line is noisy! And to
your horror, you see glitches....(spice design added 02/09)
Op amp improves power supply's regulation - 6-Jun-96 Issue of EDN A
typical power supply has a voltage-regulation specification of 2 to 3% for
all conditions, including initial setting, line, load, and temperature.
You can improve regulation if the power-supply has remote-sensing
capability, however.... [Design Idea by Jimmie D Felps, Hewlett-Packard,
Colorado Springs, CO]
