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Voltage Monitors / Sensors / Detectors

Battery Monitor Draws 8 or Less:  04/13/95 EDN-Design Ideas
Battery Monitor Emulates Auto Dashboard:  07/03/97 EDN-Design Ideas
Cigarette Lighter 9 Volt Adapter
Circuit Detects & Disconnects Overvoltages:  04/25/96 EDN-Design Ideas
Circuit Detects total OnTime:  02/04/99 EDN-Design Ideas  / PDF contains multiple circuits - scroll to find circuit.
Circuit Measures Microvolts In The Presence Of Volts :  08/23/04  Electronic Design - Design Briefs / Sometimes, it's necessary to make microvolt measurements in the presence of volts. For example, the need arose to measure the thermoelectric potentials in an RTD circuit in which the 10 V applied to self-heat the RTD made measuring such tiny)....
Circuit Provides 1.5V, 7Bus Termination:  09/14/95 EDN-Design Ideas
Circuit safely applies power to ICs:  11/22/2001 EDN - Design Ideas / Supervisory circuits normally monitor a microprocessor's supply voltage, asserting reset to the IC during power-up, power-down, and brownout. In this way, the circuit ensures that the supply voltage is stable before the microprocessor boots, thus preventing code-execution errors. Many analog and digital ICs also need a well-behaved start-up of their supply to avoid latch-up and logic-stat... .
Clamping Circuit Dissipates Minimal Power:  03/30/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find the one of interest / This circuits is a quasi-linear regulator
Cockcroft Walton Diode Voltage Multipliers:  this document describing some basic voltage multiplier circuit topologies, PDF file
Comparator Detects Failed Telecomm Supplies:  06/22/00 EDN-Design Ideas /  PDF contains multiple circuits - scroll to find the one of interest / Detects when telecomm power supplys48V output drops below its nominal value, uses an isolated comparator to monitor two48V telecomm supplies (of either polarity) / PDF contains multiple circuits - scroll to find the one of interest
Comparator Features Symmetrical Thresholds:  03/06/00 Electronic Design - Ideas for Design / The comparator often is the simplest bridge between analog and digital worlds, but crossing this bridge isn't as simple as might be thought. Keep in mind, we are leaving the analog world with an indefinite number of states and entering into a vastly. . .
Contactless AC Mains Voltage Detector
DC Power Supply:  simple circuit based on 78xx fixed voltage regulator IC, those ICs are available for some fixed voltages between5 and24V
Generate Dual Voltages That Track By Percentage Of Range:  06/09/03 Electronic Design - Design Briefs / Consider the need to vary two voltages, V1 and V2, by an equal percentage of their ranges (V1MAX - V1MIN) and (V2MAX - V2MIN), with V1MAX, V1MIN, V2MAX, and V2MIN. . .
Internal Oven Provides Voltage Reference Less Than 1-ppm/C Drift:  04/03/00 Electronic Design - Ideas for Design / When precision voltage-reference requirements demand less than 1-ppm/C temperature drift, the designer can choose to use expensive components (off-the-shelf modules) or build a custom oven enclosure. This second choice is common among. . .
Latching Regulator Prevents Deep Discharge:  03/16/95 EDN-Design Ideas
Low Voltage Alarm:  NE555 Low Voltage Battery Disconnect Circuit
Low-voltage oscillator features increased spectral purity:  11/02/98 Electronic Design - Ideas for Design / A common problem in crystal sinusoidal oscillators is the excitation of unwanted modes of the quartz crystal that degrade the spectral purity of the oscillator. This problem is significant in overtone crystals, particularly if the oscillator is. . .
Low-Voltage Series Reference Draws Only 2.4 μA:  08/20/01 Electronic Design - Ideas for Design /  For systems with miniscule power budgets, implementing a low-power voltage reference involves many compromises. One design option is the low-voltage shunt reference. Available since the birth of the bandgap cell, this device traditionally operates. . .
Maximum Voltage Sorter uses Analog Multiplexers:  09/29/94 EDN-Design Ideas
OpAmp Rectifier Signals Input State:  07/21/94 EDN-Design Ideas
Simple Circuit Detects Voltage over Ranges:  10/10/96 EDN-Design Ideas
Simple Circuit Disconnects Load From Battery:  03/14/96 EDN-Design Ideas
Solid State Relay Saves Battery's Life:  09/01/94 EDN-Design Ideas
Status Indicator Flags Five Discharge States:  01/20/94 EDN-Design Ideas / The circuit actually indicates five conditions of the battery. A steady glow assures the user that the battery is strong and healthy. A2-Hz brief flicker off indicates that the battery is starting to show age. A more insistent,50%,5-Hz flashing is a warning to have a spare battery on hand. A brief flicker on at2 Hz is the battery's last gasp. And, when the LED is continuously off, its Time to replace the battery.
Supervisory IC Makes Simple Line Monitor:  03/01/96 EDN-Design Ideas
NE555 Low Voltage Battery Disconnect Circuit
Ultimate Battery Low Voltage Alarm

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