Questions tagged [voltage-monitor]

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3 answers
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Design for 110 V brownout detector

I suspect that a power circuit in my home has an intermittent connection somewhere, and I'd like to test this to be sure (because if I'm wrong, then the equipment running on that circuit needs to be ...
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1 answer
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Need to monitor an SSR with an arduino

I need to monitor the coil side of an SSR (not actually a coil I know). The problem with my circuit is it allows enough current through the resistor divider to 0V to actually turn on the SSR. Just ...
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Query regarding MAX20480DATEJ/VY+ voltage monitor

I'm using a MAX20480DATEJ/VY+ voltage monitor for my design. Out of four inputs, I prefer to set IN1 2.5V at the same time for testing purposes. When I'm running my command, I'm constantly getting a ...
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3 votes
1 answer
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Differential op-amp battery cell monitor circuit odd behavior

I'm working on a three cell LIPO battery cell voltage monitor using three differential op-amps. I had the circuit I designed below printed on a PCB and have assembled the board, but I am getting ...
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-2 votes
1 answer
88 views

Is there an integrated circuit I can buy that essentially monitors an incoming line voltage and triggers when that voltage dips to below a threshold [closed]

Is there an integrated circuit I can buy that essentially monitors an incoming line voltage and triggers when that voltage dips to below a threshold. I see a bunch but they all seem to be in the low ...
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  • 199
6 votes
1 answer
456 views

Can you monitor the state of charge of lead-acid batteries through their terminal voltage if they're being used?

Lead-acid batteries have -approximately- linear discharge curves and are therefore more easily monitored through their open-circuit voltage. Is there a way to monitor their SoC without disconnecting ...
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  • 611
1 vote
1 answer
64 views

Varying DC pass only over set threshold (LM358)

First timer here (microcontroller hobbyist). I need to let voltage pass from battery to step down converter only when voltage exceeds set threshold. There's some MCU stuff behind the 5V step down ...
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  • 123
0 votes
1 answer
66 views

Monitoring circuit for the switching voltage

I would like to monitor the switching voltage which is switching between 24V and ground at a frequency of 100kHz. If the voltage is below 21V, then generate a reset signal. The lines are the ...
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1 vote
0 answers
44 views

Monitoring PWM Solar System

I want to try and make a power monitoring system for an off-grid solar system using a micro-controller (esp8266). I started by monitoring the battery voltage (using a voltage divider and an ADS1115) ...
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0 answers
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What can cause these strange AC current and power readings?

We are attempting to monitor the power usage for a customer using a commercial digital power meter and Rogowski coils. In one of the panels (3 phase 208/120) the current measurements are very ...
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  • 5,410
0 votes
2 answers
113 views

Adding Hysteresis to Supply Voltage Supervisor

I am going through this TI-APP note - Voltage Supervisor,with hysteresis. I am not able to understand WHY they have derived the below equation 1 & equation 2 in the App note (page 2 & page 3)...
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