Questions tagged [low-voltage]

Low voltage refers to voltages in a range from 1) 50–1000 Volts AC [Vᵣₘₛ, rms…root mean square] and 2) 120–1500 Volts DC according to standard IEC 60038 of the International Electrotechnical Commission.

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Controlling 120v line with a 12v switch on a different line

I have 10a 120v power sockets in my garage that currently doesn't have any switch on it and powers some overhead lights that I have plugged in. Separate to that, I have a 12v circuit powering various ...
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1answer
516 views

Under-voltage disconnect on MCP73871

I've designed a circuit using an MCP73871 (link below) and some lithium ion 18650 cells. I'm confused by the under-voltage lock-out (UVLO) on that chip as it's not clear (to me at least!) whether it ...
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44 views

Centre contact clamping in coaxial barrel connectors

Barrel connector plugs seem to have two different methods for keeping the centre contact under pressure. Some plugs have a rigid circular inner contact which relies on the socket to have a split pin ...
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61 views

Storing low-voltage power?

I'm doing a project for my school which requires harvesting body heat to generate electricity. Now, I've tackled this problem by using TEG, on the chest. Now, the problem is that this TEG is estimated ...
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98 views

Can I use diodes to protect power supply outputs?

(Note, this is my first question on this site, please point out if there is something that I am doing wrong here.) I have a thyratron that requires two separate power lines to attach to it. The two ...
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52 views

Can I amplify a thermocouple Signal with the GS8332-SR OP-Amp?

Theremocouples have a very small voltage of around 0.4mV/10C. K Type Thermocouple Voltage Table I want to amplify that signal so I can read it with an ADC on my Arduino Microcontroller. The Voltage ...
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45 views

Modeling the thermal part of the Time-current curve

G’ day, I am working on designing protection devices for my research work and I am struggling to model the thermal part for the low voltage circuit breakers based on IEC standards. Based on the ...
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39 views

Responsible Battery Reserve Capacity and Low voltage?

It's been asked here, but looking for clarity. How bad is it to undervoltage a 12-volt lead-acid battery? SLI automotive starter batteries list RC (reserve capacity), but I think this a usable ...
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138 views

Electric heating for glass melting furnace

Some furnaces use electricity for glass melting. Low voltage and high amperage power is passed through the molten glass through 2 molybednum electrodes dipped into the glass. The molten glass acts as ...
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58 views

Unknown 2-pin weatherproof connector

We have a meteorological station (Made by the now-defunct Solar Millennium) next to our solar plant that has a faulty connector from its PV panel. It has a circular cross section and has a screw-in ...
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4answers
268 views

Filter-Amplifier circuit for Low Voltage I/P circuitry

I'm designing my first ever circuit for a hobby project. I've a sensor that outputs in mV (1 to 2) and a controller with ADC. The ADC is 16 bits, VDDA = 3.0 V, Temp = 25 °C, fADCK = 1.0 MHz. Since the ...
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1answer
35 views

4S Lithium Ion Low Votlage Cutoff

Disclaimer: I'm not an electrical engineer, and most of what I've done so far has been from researching similar designs on the interwebs. I'm just a tinkerer with a soldering iron, so please excuse my ...
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35 views

Wiring Case fans in Parallel to a usb cable with an inline switch, still spins slow

I have 2 separate projects one is a case for a raspberry pi 3b+ as NAS server and the other is a media cabinet. The NAS kit i have 4 30mm 2-wire fans (5V 180mA) and a wired in usb cable that is ...
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29 views

Capacitor to Retract Solenoid with Low Voltage?

So what I'm basically trying to do is have a push-button motor with a solenoid to open when powered but then close and abruptly stop the gears of the motor from turning. The issue right now is that ...
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1answer
53 views

Effect of electrical arcing on the system voltage

What will be the effect of Electrical arcing (between phases or between phase and neutral) in a 415V three phase system in the downstream voltage... Will it just act as a load ( let's say the arcing ...
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1answer
54 views

How to make a power supply cable for a 10.5V 4.3A laptop OR how much higher voltage can I use

Let me preface this by saying I've spent countless hours researching and learning what I can about electronics before asking this, and I cannot find a clear answer to this. So sorry if this seems like ...
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1answer
333 views

Digital voltage stabilizer relay diagram

I am using this voltage stabilizer relay diagram below, which provides a 16 step-up level. I need to edit it, so that I can made it to work as step-down in case of high voltages such as 245 and above. ...
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1answer
109 views

Reducing the start-up voltage of a low voltage cut-off circuit

I just built this circuit, with the intent to use it as a low-voltage cut-off switch for a single li-ion cell. It works great, but once it's triggered it needs about 7 volts to turn back on, so I ...
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1k views

Low voltage cutoff circuit with PV panel

I'm trying to build a simple reliable low voltage cutoff circuit and sufficient voltage turn on circuit for a PV panel powered circuit. The idea was to supply power from PV panel to a working circuit ...
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1answer
71 views

Safety for 48v leds in water

I'm builing a 48v DC LED system to be used inside a fountain in a public space. I'm using a 48DC 30A switching power supply. What should I do to make it safe in case any conductor gets exposed to the ...
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5k views

Smallest circuit for Ultrasonic Mist Maker or humidifier

I am working on Ultrasonic Mist Maker or humidifier circuit, but does not found any good circuit. As search on google that we have to make about frequency 1.6MHz to convert water into mist. using ...
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130 views

Specifying & operating a TRIAC with a low voltage load

I am looking to do a circuit to switch a 12 VAC of a device to the ground. I intend to use a microcontroller to drive the TRIAC. The goal here is only to short the 12 VAC of a device to its ground. ...
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2answers
292 views

Biased single-source relaxation oscillator not starting

Vcc is 5 V , first op-amp LM358 provides 2.5 V ground for easiest possible relaxation oscillator build with MCP661 (2.5/5.5 V supply, 60 MHz operational range). I wanted to use it to measure values of ...
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1answer
60 views

LED Power Box Design

I am designing an LED power supply unit, using off-the-shelf constant current drivers (Phillips Xitanium). The system will include a 0-10v dimmer, and I need to connect the Xitanium to both 120v for ...
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1answer
51 views

Voltage for RGB Strip Lighting

I'm looking at building a hobby project featuring led strips. I'm looking at 5v RGB addressable LED strips The Strips. I've already more or less figured out how much I need to cut for each section and ...
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1answer
1k views

PIR (HC SR-501) not working

I'm working with ESP8266 Wemos D1 Mini and HC SR-501 (PIR sensor) in one particular project (please, see the circuit image in annex). The question is the HC SR-501 stay always LOW. I tried change the ...
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2answers
632 views

Brushed Motor Voltage Drop

First of all, I'm fairly new to electronics. I've been working on my own version of a miniature hovercraft just like this one http://www.thingiverse.com/thing:68639. I'm using an arduino pro mini for ...