The traditional inverting op-amp summer configuration exploits the feature of a low impedance node (virtual ground) at the inverting input. The summing circuit is straightforward and easy to analyze and use, though it does have some limitations.
Testing high-performance designs for parameters such as jitter is not easy, but this circuit, when used with a standard, high-end mixed-signal oscilloscope, yields accurate and meaningful results....More
Most common current-limiting implementations have a voltage drop that’s too high for today's systems with their low-voltage supply rails; this design with its far lower voltage drop is a better fit....More
With remote-desktop control and access facility of a browser, a free waveform-generation application, and a standard sound card in a remote PC, you can turn a remote ac load (such as appliance) on or off via the Internet from your local PC....More