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.
This circuit, based on discrete transistors and diodes, develops hysteresis to resolve and avoid the non-stop turn-on/off cycling that may otherwise occur when using supercapacitors as a transitional or shutdown-period backup power source....More
A simple assembly of Teflon and Kapton forms a switch that uses the generation of static electricity (triboelectricity) by basic motion to generate a voltage spike, which then triggers a circuit....More
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