Questions related to the design of circuits that supply or use a high voltage. There are a few definitions but the IEC definition of a high-voltage supply system is above 1000 Vrms AC or 1500 V DC.

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0
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2answers
99 views

Switching high current and high voltage for coilgun

I am building a multi-stage coilgun and need to be able to electrically switch 450V and over 100A somehow (virtually shorting large capacitor bank)... I've tried using IGBTs but fried them. I also ...
-3
votes
0answers
62 views

Can vacuum be drawn using high voltage corona discharge? [on hold]

I wanna make a vacuum for some experiments with homemade tubes, x-ray generators, and maybe even deuterium-deuterium fusing. I have an idea on how I could do it without obnoxiously expensive ...
0
votes
2answers
52 views

How to wire DC kilovolt meter?

I recently picked up a small DC analog kilovolt meter. The scale went up to roughly 25kv.  I have some microwave oven transformers I would like to test the voltage.  I hooked a microwave diode in ...
0
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3answers
200 views

Tapping energy from high voltage AC transmission lines

The details are hazy as I recollect this from my nipper days.Many, many years ago. “Persons were charged with stealing electricity by placing a large coil, somehow, near high voltage AC transmission ...
1
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0answers
75 views

How can this isolated DC/DC converter claim a 3kv rating?

I'm referring to the Murata Power Solutions CME series DC/DC converters. Datasheet: http://www.murata-ps.com/data/power/ncl/kdc_cme.pdf If you look at the footprint of package (the -3C variant), ...
2
votes
1answer
40 views

Gas Discharge V-Q Lissajous

I've been investigating non-thermal plasmas, specifically dielectric barrier discharges, where two electrodes, at a potential difference of several kilovolts, are separated by a dielectric and a gas ...
4
votes
2answers
347 views

How does this mosquito zapper circuit work?

For the purpose of learning, I have tear down a small mosquito zapper racket. I am now trying to understand how the circuit is working (which goal is to produce high voltage). (yellow = ...
0
votes
2answers
97 views

Center-tapped Full Wave Bridge Rectifier

I'm designing a high-voltage power supply for a plasma experiment. I have a center-tapped ignition transformer (50:1) that I'm using to step up the voltage from 120VAC to 6kVAC and then using a full ...
-1
votes
1answer
109 views

What can cause the capacitor to blast? [closed]

I had a problem with my air conditioner. The technician came in and fixed it. But he told me that the capacitor inside it was blast. I want to know what causes this and how to avoid it. Thanks!
0
votes
3answers
280 views

High voltage power lines: helicoptor versus birds [duplicate]

As can be seen in this video, bringing a maintenance helicopter to the same potential as the high voltage power line is not without some arcing. Why doesn't that happen to birds?
0
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0answers
36 views

Current Return Path for Plasma Experiment

I'm planning to use an old non-GFI neon transformer to produce plasma for some research I'm conducting. However, the neon transformer is center-tapped which complicates diagnostics (such as ground ...
-4
votes
1answer
64 views

Bus bar calculation

I am trying to learn bus bar calculations steps . can someone help me how to get started for DC/AC bus bar calculation. how to get started?? what are the parameter need to be considered. 3.when skin ...
1
vote
3answers
125 views

Make 5kV, 0.001A (5W) step-up from 12V?

I have faced that problem: 9-15V Vin (12V accu) and 5kV, 0.001A out (5W) and dont know how to solve that, i tried to use push-pull SG3525 but efficiency is very poor, about 20-30%. Can someone suggest ...
1
vote
2answers
68 views

High voltage input window comparator

I'm trying to find pieces (comparators or op amp) to make a window voltage comparator. My window range is 180VDC to 230VDC. Did you ever heard of high voltage input comparators? I don't need a high ...
1
vote
1answer
74 views

Removing neon transformer center tap?

I have recently acquired an old neon transformer (rated 12kV) for conducting some low temperature plasma experiments. It is the mid-point grounded style with a center tap on the secondary coil. I had ...
1
vote
4answers
438 views

How can a faulty USB charger kill you?

This question relates to this incident here. Where a women in Australia died from a faulty USB charger that allowed the full 240v mains voltage through the USB cable. Now from my understanding you ...
0
votes
1answer
64 views

Question on capacitive circuit in practice

If we were to build a circuit, let's say with a power source of 120V AC going into a transformer which steps that up to 10kV @ 30mA, the output of which would be connected to a capacitor with a ...
1
vote
1answer
98 views

High voltage/current design on PCB

I am building a circuit that allows me to control a set of light (more specifically Christmas lights you see in supermarkets) with relays (AQH 2223). My idea is to have the controller input on one ...
-4
votes
1answer
40 views

Supply high power to mp3 device [closed]

i have an old mp3 device , by wrong i supplied a high volts to it through the battery place, Now it isn't work . By guessing . Which part of it's board has affected by this high power, to replace ...
0
votes
3answers
189 views

DC-DC step up from 3V to over 100V

I'm currently building a DC-DC step up circuit to step up 3V to 100V. I don't want to use transformer because i want to keep the circuit as small as possible. My thought is ... building a 30V-output ...
1
vote
1answer
87 views

High voltage measurement with an Arduino

I'm looking for a way to somehow measure voltages in the range of 60~90V with an arduino analog input. These voltages are biasing a rather sensitive APD exposed to very low light levels, which ...
1
vote
1answer
42 views

PWM photodiode bias circuit control voltage

Cant the photodiode bias regulator described here, Fig 6 be controlled with a PWM input? The RC loop right at the control input seems to filter PWM frequencies, but I am not sure if there are any more ...
1
vote
1answer
178 views

Can I run 2 transformers in series?

I need a 15kV or higher power supply. I found 2 used neon sign transformers rated at 10kv. Can I use both of them and connect the secondary coils in series to get 20kV? I am not sure if 15kV isn't ...
0
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1answer
154 views

Circuit building question

So I have been looking at building a circuit for a water-powered motor that I have been trying to develop. I plan on starting off with this battery. Then I will hook it up to this high voltage ...
0
votes
3answers
67 views

High voltage sealant coating

What would be the best way to electrically insulate the high voltage (60-90V) area on a PCB? I've seen a silicon-like coating on several PCBs, but I am not familiar with the product or its application ...
3
votes
1answer
421 views

Need a continuity LED for high voltage capacitive discharge rocket launcher

I'm designing a capacitive discharge rocket launcher. The reason for the cap discharge is to ignite a series of many devices at once. I did not want to switch the HV with the momentary pushbuttons ...
2
votes
2answers
101 views

High-voltage capacitors in space

I'm currently designing an high voltage DC/DC converter, from a linear technology app-note. My goal is to bias an avalanche photodiode with 200 to 300V, on a small educational satellite. I picked the ...
1
vote
3answers
149 views

Is there a maximum possible voltage?

This question got me to wondering if there is a maximum theoretical voltage. It seems to me there's a limit to how much positive or negative charge you could have--say, a container full of electrons ...
2
votes
1answer
93 views

Cascoded/Bootstrapped Transimpedance Amplifier

I've come across an interesting transimpedance amplifier toplogy, that reportedly reduces voltage and current noise and compensates for large photodiode capacitance. However, as I'm working with an ...
1
vote
3answers
101 views

Controlling a 220V European outlet from Arduino

I want to use an Arduino to control my 220V outlet. I have searched the web and stack a couple of hours and all I found was this product from Sparkfun and Adafruit, but it does only take 110V and it ...
2
votes
2answers
311 views

A way to measure unknown high voltages with an oscilloscope

I have a sort-of black box of a circuit that is used to generate plasmas. I'm sure it outputs on the order of kV but I'm not sure at all about the current. I was wondering if there is a way to measure ...
0
votes
2answers
96 views

How do plasma lamps work? [closed]

I've been trying to understand how plasma lamps (or plasma globes, according to Wikipedia) work and why you don't die a horrible fiery death when you touch them. What I've got so far is that the ...
0
votes
1answer
58 views

Current Monitors for Avalanche Photodiodes

I've come a across a document by Linear Technologies that suggests several circuit schematics to interface with an Avalanche Photodiode (APD). They are referred to as current monitors and placed ...
11
votes
2answers
630 views

How are neon sign transformers built?

I'm aware that neon sign transformers (NSTs?) produce high voltage - up to 15kv. But I cannot picture what's inside of one. Wikipedia seems to indicate that they may be a form of resonant ...
1
vote
1answer
93 views

Calculating capacitance for high voltage doublers

I am working on a power supply for a tesla coil, and keep having really annoying problems with MOTS (microwave oven transformer). We have a bunch of microwave capacitors and diodes, which we are ...
7
votes
2answers
354 views

Why does arcing occur on helicopter power-line repir [duplicate]

I saw this video, where a guy did power line inspection from a helicopter, which is isolated from ground. When he held out a "magic wand", a small amount of arcing came off of the power line to the ...
0
votes
1answer
117 views

Where to salvage inductors?

I need a toroidal inductor for my ZVS flyback driver. The value should be between 47uH to 200uH. It should be able to handle 6A. Where can I salvage them from?
2
votes
3answers
167 views

NE555 Flyback Driver MOSFET failiure

simulate this circuit – Schematic created using CircuitLab I made this simple NE555 Flyback driver. I used a 9V Battery to power the NE555 and a 24V 6A power supply to power the flyback. ...
0
votes
0answers
77 views

How to get better output out of flyback driver?

simulate this circuit – Schematic created using CircuitLab I used this circuit to power my flyback... I used an MJE3055T Power NPN and 10kOhm pot. The flyback is FKD15A001. I used the ...
0
votes
2answers
112 views

Cheap high-voltage low-current source

I'm looking to make a high voltage supply for some geiger-mueller tubes (the ubiquitous sbm-20 russian surplus tubes that everyone uses). these don't require much current at all, so creating high ...
0
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1answer
111 views

IC555 flyback driver troubleshooting

I made a flyback driver which just uses an astable 555 circuit to drive the flyback. The 4 and the 8 pins were connected to the positive rail. 7 pin was connected to the positive rail via a 1K ...
2
votes
2answers
267 views

Switchgear vs. power distribution center (PDC) vs. motor control center (MCC) - what's the difference?

Here's what I've observed so far: All three contain circuit breakers. All three supply power to motors, although switchgear and PDC-fed motors are obviously higher-voltage, larger motors. ...
4
votes
4answers
377 views

Digital logic input with very wide input voltage range

We are developing an industrial controls product that will be used to monitor the presence or absence of voltage ranging from 5V to 480V. Since the unit will be generic and programmable, this input ...
2
votes
1answer
114 views

Disconnectors Symbol in Single Line Diagrams (SLD)

where should the moving part of a disconnector be located when breaking gets applied, on the energized side or on the disconnected side? Is there any standard?? Suppose a non ring, simple grid and ...
2
votes
2answers
71 views

Safety concerns using metal switches near 300V (low current) lines?

I am building a nixie tube clock whose power supply in the best (or worst) case scenario will put out ~300V. This is obviously quite hazardous if not handled correctly. I need to use at least 1 spdt ...
2
votes
1answer
67 views

How uniform fields obtained between a set of electrodes in High Voltage Engineering?

In high voltage engineering, sometimes we need uniform fields between a set of electrodes. Parallel plate electrodes are not solution for that because they are finite so they will have fringing ...
1
vote
2answers
190 views

Marx Generator or Voltage multiplier

I am building a coilgun and I have constructed a coil with several thousand turns, an ohm meter measures its resistance at 300 ohms, so I am having trouble powering it, I ran 240v through it and got ...
0
votes
0answers
135 views

MOT Power supply issues

I am working on a quad MOT (microwave oven transformer) tesla coil. We tore apart 5 microwaves and got some MOTs. We first tested each MOT individually. They did not seem to have any problems. We ...
0
votes
0answers
44 views

Interrupting Current Limit Contactor; Circuit Breaker interrupting current

I am developing a contactor, an electromagnetic contactor. Magnet coil pushes a moving contact to make or break with a fixed contact. Now the design guideline says that there is an interrupting ...
2
votes
1answer
189 views

How can I control high voltage signals? (1 to 15kV.)

I'm an embedded s/w guy, but I'm able to do low voltage circuits without too much trouble. So I will try to ask this question on high voltages! I've got a power supply running at 1 to 15kV. It runs ...