Questions tagged [power-filtering]

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How to choose reverse polarity protection - diode vs MOSFET

I am reviewing the power stage of a board which is to be connected to a wide range of cars and motorbikes, with internal combustion engines, old, new, 2 stroke, 4 stroke, etc. Current schematic looks ...
Jack's user avatar
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0 answers
115 views

What is the purpose of these two capacitors?

I came across the schematic shown below. What is the purpose of C22 to C25? Unless they are used for differential noise, since FL1 eliminates the common mode noise present.
JoeyB's user avatar
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1 vote
2 answers
138 views

variable speed drive interfering with distant PHEV charger

I am using a generic variable speed drive for a water pump. About 5% of the time that I run it, it stops my BMW 530e PHEV from charging. What is the most likely cause? What measurements can I make to ...
personal_cloud's user avatar
2 votes
1 answer
93 views

Why is there a big voltage drop across my capacitance multiplier?

I'm following this application note to implement a low noise 48V DCDC boost converter for a microphone phantom power circuit. My boost converter works fine, but I'm having trouble with the capacitance ...
jeffmakes's user avatar
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0 answers
64 views

Control a resistance in AC circuit without generating current harmonics

I am currently working on a project aiming to control the amount of current flowing through a resistance from 0 to nominal in a continuous manner. The catch is that the power is 230 VAC 50 Hz. My ...
TheBlackDev_'s user avatar
1 vote
1 answer
148 views

Does such a circuit make sense and will it filter the DC-DC converter noise ripple?

I have designed a circuit that simulates noise filtering from the output of a DC-DC converter. The filter should be between the output of the converter and the load. It is assumed that the load will ...
Jerzy Przezdziecki's user avatar
3 votes
4 answers
219 views

How to eliminate 3.3V regulator output spiking

Using a this DC-DC converter https://www.digikey.com/en/products/detail/traco-power/TSR-1-2433E/12171286 Input is coming from this DC power supply https://www.amazon.com/TalentCell-PB240B1-...
Erric DiFilippo's user avatar
-1 votes
1 answer
72 views

12VDC 3500mA filtering, what are voltage regulators and capacitor values [closed]

I have a 12VDC 3500mA power supply and I would like to filter the outgoing voltage from any noise. My plan is a simple scheme: output from the power supply -> capacitor -> voltage regulator ->...
pggu11's user avatar
  • 33
0 votes
1 answer
172 views

How do you interpret LTSpice graphs?

I've created a circuit in LTSpice to model a fan assembly I'm looking to build. In the below circuit the current sources represent the fan and the voltage sources represent the voltage source I'll be ...
timsweeney7's user avatar
1 vote
1 answer
130 views

Two electrolytic filtering capacitors near or far away from each other?

I have a PCB where I placed a 100uF capacitor near the power supply connector, for power filtering. This capacitor is too big so in my next design I want to use two 22uF capacitors. My question is: ...
Pedro NF's user avatar
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0 votes
2 answers
74 views

Power source choice for sensitive applications. USB cleanup vs wall wart step down

When designing a board with a rather sensitive IC that runs on 5V and a goal of minimizing external components. Does it make more sense to power everything from USB with thorough filtering, or rather ...
Horst's user avatar
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0 votes
3 answers
2k views

Filtering for USB VBus to 3.3V

I have a circuit taken from an FTDI app note that takes USB +5V VBus and filters it into 5V Vcc. This circuit works well. I now want to modify this circuit to output +3.3V and I am unsure exactly what ...
Doug12745's user avatar
  • 319
1 vote
1 answer
654 views

Capacitance multiplier for synth PSU?

Noob alert. I'm about to build a pretty simple PSU for my modular synth project. I'm looking at a few schematics from popular sites and I've previously built a simple wall-wart one based on this from ...
Viktor Hedefalk's user avatar
0 votes
2 answers
216 views

Filter harmonics in AC power line [closed]

I run a Toshiba Digital copier machine in my shop and the machine started showing error codes related to power issues a few days ago. This happens randomly during daytime. There were no problems at ...
Anuradha's user avatar
  • 155
2 votes
1 answer
157 views

Taming "spiky" AC voltage source, need to reduce the max amplitude

Input I've been tasked to find a way to convert the output of a peculiar AC permanent magnet generator, so that it powers a lower voltage device. The output of the generator looks like this (at the ...
anrieff's user avatar
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1 vote
1 answer
4k views

How to design filter for inverter for following cases?

I am going to make two pure sine inverters for collage project. Both inverter uses 24V battery as DC voltage source. Switched to ~360Vdc and ~180Vd by boost converter accordingly. Both then switched ...
Ridham's user avatar
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4 votes
3 answers
17k views

How to design LC filter for smoothing out sine wave from sine PWM?

I am making an inverter to convert 12 DC to AC(~8.5Vrms) @50Hz. Later i will do the same for 400V DC to 250Vrms. I am using IRF540N and IRF9540 mosfets as switch. And IR2110 mosfer driver for gate ...
Ridham's user avatar
  • 646
1 vote
1 answer
320 views

Is my laptop charger is working as harmonic filter and absorbing harmonics?

I have a square wave backup inverter (UPS). Whenever the power goes out, UPS turns on but all the fans run with noise and humming sound. I know it is because of square wave and harmonics. But when I ...
NomanAhmed's user avatar
1 vote
2 answers
433 views

Does triac used for on/off purposes need RFI suppression?

I noticed that in dimmer circuits using a triac there is a need for chokes to suppress RFI, Do on/off only circuits need the same?.. Please I need a detailed explanation or references to understand (...
m sayed's user avatar
  • 21
1 vote
0 answers
489 views

power supply noise causing resets of MAX7219 LED driver

I have wired up an ESP8266 wifi uC to a MAX7219 7-segment driver. The setup works well, except that the circuit seems susceptible to external noise. The main issue I have noticed is that activating a ...
Roberto's user avatar
  • 155
14 votes
1 answer
7k views

Why would a device require at least 10m of wire between its outlet and the service panel?

I found this warning on a little slip of paper, in with an Insignia surge protector: DO NOT install this device if there is not at least 30 feet(10 meters) or more of wire between the electrical ...
Dan Ross's user avatar
  • 243
0 votes
1 answer
199 views

Led driver interference on lcd screen but only when with 1 power source

I have a few lcd open panel screens I've modified with higher powered led strips instead of ccfl. In doing this I needed to add led drivers for voltage and current regulation. When utilizing the same ...
RJ44's user avatar
  • 11
3 votes
2 answers
627 views

Killing Kickback with capacitors

I am having some problems with an active rectifier (AFE unit) that produces a 8 kHz and a 50 Hz component on my DC. We have bult in a normal standard Low-pass filter that deals with the 8 kHz, so no ...
Jimmy Henningsson's user avatar
0 votes
1 answer
146 views

DC-DC Converter: Periodic Ripple

I'm building a sensitive analog circuit powered by a wall wart. I'm using a DCV01 family DC/DC converter with dual outputs (+/- 6.5V) followed by linear regulators. The SYNC pin of the DCV01 converter ...
nick_name's user avatar
  • 191
0 votes
1 answer
173 views

Why does the amplitude go down by half?

What do I need to do to this circuit to keep the gain at 0 dB until 23 kHz to 25 kHz? The gain goes to -6dB. I want the gain to remain at 0 dB until it's 23 kHz to 25 kHz, that's when I want the cut-...
tilengneer's user avatar
3 votes
3 answers
4k views

Power supply filter choke failure - how and why?

Trying to repair a non-working Fiber to Ethernet Converter. When connected to power, the unit made a hissing/sizzling/scratching sound and the all LEDs glowed dimly. I isolated a small surface-mount ...
Ryan Griggs's user avatar
  • 2,676
0 votes
1 answer
2k views

Suggestions about proper usage of vk-200 choke

I have an old custom-built non-switching 5V power supply (usual 220V-12V transformer + bridge + 7805 regulator + various capacitors) that I'm using to power a HF upconverter and a HF LNA. I'm ...
MarioCannistra's user avatar
1 vote
2 answers
197 views

Is this sufficient filtering for an mcu?

I'm a software engineering student and an electronics hobbyist, and I am currently designing a circuit using a 80Mhz pic32. I wondering if the noise filtering that I have is acceptable and if it could ...
user5389242's user avatar
29 votes
6 answers
23k views

Ferrite bead vs common mode choke

simulate this circuit – Schematic created using CircuitLab I inherited the top circuit from a previous designer on my robotics team. The circuit uses two ferrite beads, a zener, a TVS and a ...
vini_i's user avatar
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