Many approaches for creating notch filters, which reject a narrow band of frequencies and pass all others, are unsatisfactory because they allow the component tolerances to interact. The circuit in Figure 1 overcomes this limitation and enables ...
Power meters provide an early warning of thermal overload by monitoring power consumption in high-reliability systems. Power monitoring is especially suitable for motor controllers, industrial heating systems, and other systems in which the load ...
Many suitable circuits exist for driving LEDs in constant-current mode and from low-voltage sources. For example, references 1 , and 2 show circuits that use switched-mode-regulator ICs and low-voltage sources to supply LED current. To produce a ...
Energy-harvesting, or “scavenging,” systems extract energy from the ambient environment. Unfortunately, these power generators supply much less energy than do standard batteries. However, thanks to the decreasing size and low-power ...
Larry Suppan, Maxim Integrated Application Note 657 Placing a load-disconnect circuit on the output of a bootstrapped step-up regulator allows the regulator to start with load currents much higher than would otherwise be possible (Figure 1). During ...
Maxim Integrated Application Note 1872 This application note presents a circuit that uses a low-power CMOS comparator to provide an LED visual indication of a low-battery condition. This LBO (low-battery-indicator) is achieved by pulsing the LED at ...
The Design Idea in Figure 1 is a precision current mirror used to drive two strings of five white LEDs. Figure 1. Current source/mirror driving two LED strings. The op-amp has double negative feedback (since M2 inverts the signal at the ...
With portable battery-operated devices continuing to add functionality while shrinking in size, printed-circuit-board real estate becomes increasingly valuable. Single-supply circuitry can help by saving space and cost. Adding audio or video, ...
All dedicated current-sense amplifiers provide high-side sensing on a positive supply, but you can adapt such circuits for monitoring a negative supply (Figure 1). The positive-supply pin, V+, connects to the system's positive supply, and the ...
Mark Cherry EDN A single temperature sensor can provide an interrupt to a microcontroller when the measured temperature goes out of range. You need multiple temperature sensors when you have to monitor more than one hot spot. A microcontroller ...