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Questions tagged [power-filtering]

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26 views

Rc filter to ground

On one of the machines I'm working on we have a cabinet that ties parallel resistors and capacitors to a machine ground. The cabinet is in parallel with the machine's main transformer and the ...
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3answers
72 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 ...
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1answer
163 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 ...
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2answers
86 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 ...
2
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1answer
95 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 ...
1
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1answer
657 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 ...
2
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3answers
8k 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 ...
1
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1answer
121 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 ...
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2answers
230 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 (...
1
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0answers
292 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 ...
12
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2answers
3k 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 ...
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1answer
124 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 ...
4
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2answers
312 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 ...
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1answer
112 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 ...
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1answer
133 views

Can anybody tell me why the amplitude goes down by half?

Can anybody tell me what I need to do to this circuit to keep the gain at 0dB until 23kHz to 25kHz? The gain goes to -6dB. I want the gain to remain at 0dB until it's 23kHz to 25kHz, that's when I ...
3
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3answers
2k 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 ...
0
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1answer
1k 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 ...
1
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2answers
127 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 ...
24
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5answers
13k 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 ...