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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0answers
32 views

My slayer exciter circuit is non functional

I built a miniature slayer exciter using this schematic: The transistor is an MPSA-05 from Central semi, the resistor is ~22Kohm the LED is a Vishay pure green 5mm, the coil is ~250t of 36 AWG wire ...
2
votes
1answer
65 views

High voltage power supply and shunt regulator design

I'm building a high voltage power supply for a tube amplifier preamp and I need some advice. I need a power supply with a shunt regulator that is rock solid stable and dead quiet and outputs 600v ...
1
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2answers
34 views

LiPo/Li-Ion Cells in series max end-to-end voltage

I have wondered how many cells can be connected in series before issues may arise. I also wonder what specifications on the tech data sheet would allow you to decide which batteries are best for high ...
0
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2answers
42 views

DC High Voltage Line Splitting Problem (Electrode “Tuning” Application)

I am having trouble coming up with a solution to a problem engineering a DC circuit that can take a single line input (Vin) and split into two outputs (Vout1 & Vout2). The goal of the circuit is ...
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2answers
50 views

How do I open a grill ignitor? [on hold]

My grill rusted apart, so I decided to salvage the spark circuit. But there's a problem - I can't find the polarity of the ports, and I can't open up the blackbox. http://i.imgur.com/BXqiQjP.jpg How ...
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2answers
53 views

Calculate primary winding current in transformer under load[Exercise]

I have been trying to get to the answer to this exercise shown in the Solutions' reference page but despite countless attempts couldn't get to it. it reads as follows: ...
0
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2answers
33 views

How to multiply voltage of a pulsating positive only source?

Total newbie here. I'm trying to multiply the voltage of a positive only pulsating source. It variates from 0v to 500v. All voltage multipliers I found explain how they work with a AC source, ...
9
votes
3answers
703 views

What voltage do electrical fly killers use?

I am interested in the voltage used in electrical fly killers - does anyone know (no speculation please) the voltages generally employed? To be clear, I am talking about mains powered, wall-mounted ...
0
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3answers
72 views

How would I design a cable line that doesn't leak heat to the ground surface?

A loaded underground power cable dissipates some power as heat which heats the surroundings. The following scenario is possible in regions where large amounts of snow accumulate on the ground during ...
1
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2answers
25 views

LT3750 Capacitor Charger DONE pin

I'm drawing out a circuit using Linear's LT3750. I don't quite understand the DONE pin. What I want to do is add an LED and have it come on when charging is done. Like in a camera. Can someone suggest ...
0
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2answers
55 views

High voltage switching transistor [closed]

Is there any transistor that can be used to switch voltages up to 3000 volts? What transistor could it be?
0
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3answers
120 views

Capacitors -> Storing 500 Joules in a capacitor with a simple 9 volt battery

I am a newbie to not only this forum, but electrical hobby(ing) also. I need 500 Joules within a few milliseconds from a capacitance. I plan to make this capacitance at "home". I plan on using a ...
0
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1answer
38 views

Why a high voltage AC always present in SMPS AC to DC power adapters

I'hv seen every 2 pin SMPS AC to DC adapters shows a little high voltage respective to the ground on the out put, on both + and GND wires(or more if more wires present). This voltage is high enough ...
0
votes
3answers
104 views

generate high voltage using LM555 with a transformer

I'm a French student (please forgive my bad English spelling) who works on a system of portable echograph (you can find the information of the project on the wiki of echopen). Could you help me ...
1
vote
1answer
47 views

Unbalance current in capacitor bank

I'm working with a 11 kV capacitor bank and is trying to calculate (by hand) the I0 current (down right on attached image). The circuit is three phase, 11 kV ph-ph. The I0-amperemeter is the only ...
0
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2answers
167 views

How do I test a USB drive to be sure it is not a “USB killer”

I have recently read of a dangerous USB drive containing a circuit instead of storage, that destroys the hardware of a computer by injecting a high voltage, high current pulse into the port it is ...
1
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1answer
70 views

How can I be sure I blew up my WS2812B strip?

I have a WS2812B strip which, I guess, I ruined it. I connected a 12V adaptor (by mistake) to the strip. I have a multimeter and when I check the +5v/GND end terminals of the strip, the meter lights ...
0
votes
1answer
109 views

Where can I find a transformer that will step up a 12v input to around 400v?

So i'm trying to build an ultrasonic levitator by following the build on mike's electric stuff's channel h ttps://youtu.be/qy1w6rTpC2g . I've set everything up same as he did, following the schematic. ...
0
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0answers
74 views

How to switch 330v DC with an arduino?

I am building a multistage coilgun, and I need a way to switch each stage using an arduino, to the coil. I am considering using relays, but I do not know how many amps they should be rated for to work ...
0
votes
2answers
50 views

Using Arduino relay board outside its intended voltage

I am making a multistage coilgun, with the switching of stages controlled by an Arduino Uno R3. There are ten stages total, and each stage has 5 80uf 330v photoflash capacitors. I need a way to switch ...
1
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1answer
62 views

Why is ground shared between primary and secondary side in LT3750 circuit example

LT3750 is a capacitor charger controller IC. The sample (typical application) circuit in its datasheet shows an otherwise isolated secondary side sharing a ground with the primary side. A PCB layout ...
1
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2answers
55 views

Switching Electric Fence Live Wire

I would like to be able control if the live wire of an electric fence is hot or not using a microcontroller. Turning the energizer on and of is not an option because it is powering the whole premier ...
0
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1answer
68 views

what means starting and Maintaining voltage in this specification?

i want to drive a pneumatic ejector(open and close), is specifications in following: ...
2
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1answer
77 views

High Voltage Power Supply Design

I need to charge a 1000uF 400V capacitor bank off of a 7V LiPo battery within roughly 5 seconds, and have the circuit be as small and light weight as possible. With a constant voltage supply and a ...
1
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2answers
53 views

Transformer for electrostatic speaker (high voltage, very low current)

I've read recently about DIY projects making electrostatic loudspeakers (example). The membrane of the speaker should be supplied with bias DC voltage between 1 and 5 kV, roughly. There is virtually ...
1
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1answer
84 views

How to measure the current of a high voltage CO2 Laser?

The manufacturer of the CO2 Laser tube instructs to put an amp meter on the low side of the laser tube for calibration. While I understand the amp meter will only see a few milli volts above ground; ...
1
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1answer
82 views

Use of output inductor for high-voltage supply circuit

I am in the early stages of designing an adjustable high-voltage DC/DC converter (similar to the EMCO C80 module) and one of the goals is to be able to closely monitor & respond to the output ...
1
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1answer
125 views

High voltage (70V) amplifier

I need to generate a 400Hz 26V rms signal with at least 200mA drive capability. 26V rms means 72.8V p-p is required. It is to drive the rotor winding on a synchro system. I was planning to use 2 x ...
1
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1answer
232 views

Difference between disconnector, circuit breaker and load break switch?

There are various types of devices available for carrying out the switching and tasks. I have a question about the differences between disconnectors, circuit breakers and load break switches ...
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4answers
379 views

300 Volt / 2 A - DC Power Supply

I want to design a 300 volt DC / 2 Ampere power supply, for a high-power amplifier circuit. The input can be either 220 volt AC, or 18 volt DC; both of them are available, however, 220 volt AC is ...
0
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0answers
28 views

field inversion meaning in underground cables?

In one sentence that talks about the conductor in underground cables says: "If the gradient of conductivity is sufficiently large, a field inversion phenomenon can occur. This mean that the electric ...
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votes
3answers
89 views

Can power boxes emit X-rays? [closed]

About those power boxes that are in cities: http://imgur.com/a/CR7L4 I can hear from a couple of on ground power boxes a very noticeable buzz of electricity. There are a few power line poles with ...
0
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0answers
62 views

Feedback to control boost converter circuit

I'm trying to implement the last part of a research paper about electrovibration. At present, I have a flyback transformer generating ~100V AC, which is being modulated by an MPSA42 BJT NPN ...
1
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1answer
65 views

Does a Wimshurst machine work fine with normal glass disks?

I want to build my own Wimshurst machine and I cannot find plexiglass disks. However, in our town there is somebody that cuts normal glass circles–so I wonder if normal glass disks would replace ...
0
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1answer
80 views

Is my current transformer rated for 11kV Tranmission line?

I'm using a current transformer to measure current on HV transmission lines. Except i'm finding it difficult to find a split core CT that will be rated for 11kV. My CT that i'm looking at is the ...
0
votes
2answers
137 views

How to get an output of 100V from a 3.3 V pulse waveform?

We have a problem when trying to drive a piezo transducer(the output of microcontroller is a 3.3V pulse, but the piezo works around 100V-300V, so we have to convert the 3.3V pulse to 100V pulse). ...
1
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1answer
124 views

Need advice regarding a regulated HV DC power supply for Magnetron

I need a DC 4.2Kv 300ma power supply, and am looking for advice. I'm currently using a the guts of a microwave oven (transformer/diode/capacitor) to power a magnetron for a physics experiment. The ...
22
votes
4answers
3k views

How can a high-voltage transistor be in such small packaging?

For example: STN0214 - Very high voltage NPN power transistor It is said to accept more than 1 kV between its collector and emitter. It comes in a SOT-223 package (3 pins plus a tab). With a ...
1
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1answer
50 views

Tranmission line equations when initial conditions are not zero

A high voltage DC line is in steady state sufficiently long time after applying 1 MV at the input terminals through a DC voltage source of 30 ohm impedance with an open circuit at the load end. The ...
3
votes
5answers
946 views

Can a charged 120v high voltage capacitor really kill you? [duplicate]

recently I have been hacking few psu and have to deal with some high voltage caps. It sort of scared me, but thinking about it, what is the chance of it really killing me. Is it safe to touch one ...
1
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1answer
186 views

Make stun gun with Arduino as oscillator

    Hello. I've noticed that for creating "sparks" with an transformer I need an oscillator. I want to know if I can use arduino for this. I'm afraid of breaking it because of the ...
1
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2answers
71 views

Centre Tapped Transformer Full Wave Rectifier Output Voltage

I'm currently constructing a power supply for a small helium neon laser tube, based on this circuit: The output of a centre tapped transformer (small neon sign transformer), is rectified by two ...
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votes
1answer
64 views

Making an oscillator for a boost converter

I want to make a boost converter to boos around 1.5 V to 5 V and i read that if the switch in the middle is switched on and off quickly, i can get a continuous increased voltage. simulate this ...
1
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2answers
152 views

Boost converter design help

I need help on a 12v-220v Boost converter design. the converter is to have a feedback system that keeps the output voltage steady even when the input voltage drops. I have done a lot of reading and ...
0
votes
2answers
154 views

How much clearance through air is required for 10 kV DC?

Suppose I have two uninsulated connectors with 10 kV DC between them. How much clearance through air should I have between those connectors? What table is this found in?
6
votes
3answers
201 views

How do I safely discharge this capacitor with broken wire?

My electric lawn mower won't start, upon inspection some wires got loose and damaged by the motor. It's a 20µF 500V capacitor. Normally I would try to short the pins with a screwdriver, but as you ...
2
votes
3answers
425 views

Capacitor discharge at lower voltages

Question 1: I have been looking around and could not quite get my head around if the same principle of high voltage and low current conversion applies to capacitors as with "power lines". For ...
0
votes
1answer
55 views

Best way to regulate high voltage

I am currently working on a motor driver that should operate on 100V or higher voltages. I need to implement logic there with 3.3V. I could provide additional, low voltage source but that would give ...
0
votes
1answer
149 views

How to generate highest voltage possible without sparking?

I need to precisely control high voltage in order to maximize the corona discharge zone while preventing arcing for a physics apparatus. The actual voltage when the corona breaks down will vary ...
0
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3answers
134 views

How does EMI affect a circuit? [closed]

I was designing pcbs and my head engineer told me that if input supply is large then there should be a separate layer for ground and positive supply as this will reduce EMI effects on the nearby ...