Questions tagged [dc]
DC stands for Direct Current, which means the flow of electric charge in a single direction. Examples of a DC source are batteries, solar panels, and dynamos.
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What actually creates impedance, or what increases the impedance of a system?
I remember learning in school that electrical devices work because the wires in them are conductive, so electricity flows easily through them. But some electrical things, like (traditional ...
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Sending PWM signal over Cat5
I'm trying to send PWM signal to MOSFET gate to control 12VDC 2A motor. The NE555 circuit is built as shown in this article (https://www.build-electronic-circuits.com/555-pwm-circuit/) with the same ...
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DC Motor regulated with cheap PWM regulator make electrical noise
On my camper with a 24VDC circuit, I've a small computer to show the water tanks level and a DC circulating pump with a PWM speed regulator bought on Amazon, regulating at 60% speed.
The computer is ...
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MOSFET Large Signal Mesh Analysis By Inspection
Let R1 = 4M Ohm, R2 = 2M Ohm, RD = 8k Ohm, RS = 6k Ohm, VDD = 15 V, VTN = 1 V, VOD = VGS - VTN, and VS = 3 V. The task is to find the Q-Point of the circuit below:
I drew the equivalent circuit (...
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Does low-side switching produce less heat than high-side switching?
I am building a reverse polarity protection circuit by adding a PMOS onto the High side of the circuit. However, the PCB I'm building is way too small for a large heatsink to sink >20A of ...
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What is a systematic way of handling DC inrush currents?
Let's say I have the following setup:
24VDC PSU → PWM Dimmer with 5A outputs → Incandescent 24V 40W bulb
While the 40W bulb consumes only ~1.5A, its inrush current is about 10A. The PWM dimmer has no ...
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Should I connect frame ground to AC earth ground?
I have a robotic work cell which takes in 120VAC and runs off of a 24VDC power supply. There are a few DC devices in my system which come with a ground terminal (in addition to the + and - terminals). ...
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High power control by N-channel MOSFET
I'm looking to switch the high power 600 A 76 V dc from a battery.
So I was thinking about using 8 N-channel MOSFETs arranged in parallel.
MOSFET: IAUA250N08S5N018AUMA1 (Mouser)
Could you please give ...
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Problem with TPS65130 adjustable power supply
I have made a PCB based on the TPS65130 for an adjustable positive and negative power supply. After installing the components and testing the PCB I am getting strange results.
When DAQ output = 4.93
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What does LTspice's description of the AC Analysis tool mean?
The text in LTspice's description of the AC analysis tool says the following: "Compute the small signal AC behavior of the circuit linearized about its DC Operating Point".
What does that ...
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False rail to rail buffer?
My question, as the title suggests, is about a simple opamp that looks like it exhibits rail to rail DC characteristic when used as a buffer. The opamp per se is a simple 2-stage PMOS input stage ...
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How to create a simple voltage inverter?
I have a 5V power supply and an input voltage that’s between 0V-5V. I need to create a circuit where, after feeding the input voltage X (X is between 0V-5V), the output voltage is 5-X (5 MINUS X) V. ...
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Simulating LM2596 as inverting regulator in LTSpice
I have some trouble with LTSpice simulation in which i simulating LM2596 to output -12V from 20V input. I noticed the circuit needs around 77 ms (I simulate it to 1 second just to add a good margin) ...
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500V Surge Protection 24V
The circuit shown above is my current protective circuit. The device must withstand 500V surge pulses in accordance with the 61000-4-5 standard. The device is operated with 24V.
I now have the ...
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12V to 1.5V 700mA DC converter for Quartz Clocks
Problem: I have an aftermarket (quartz) clock in my automobile. It now runs off a single AA (1.5V alkaline) battery. I wish to delete the AA battery and connect the clock directly to the OEM wiring in ...
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