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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1answer
41 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 ...
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5answers
626 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 ...
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1answer
90 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 ...
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2answers
27 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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0answers
42 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 ...
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2answers
78 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 ...
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2answers
96 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
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3answers
157 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 ...
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3answers
336 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 ...
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1answer
46 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 ...
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1answer
138 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 ...
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3answers
98 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 ...
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1answer
97 views

Is it safe to pass 240AC power through the ACS712 current sensor?

I'm trying to build a little Arduino circuit to automatically turn on a dust collector when my saw is on and drawing power. My plan is to use an ACS712 current sensor (30 amps) to detect and transmit ...
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2answers
82 views

High-voltage frequency divider

How can a frequency divider for high voltages be implemented? Is it possible to make it cheap and compact? An application would be to mount it between the output of fluorescent lamp ballasts ...
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1answer
70 views

Safe use of high voltage in laboratory environment?

I'm completing a project in the lab that requires a spark. As such I've acquired an ignition coil and can use the Lab's standard 12V DC power supply that connects to the 240V AC Mains to power the ...
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2answers
70 views

Using a low voltage opamp for feedback with high voltage mosfet?

I've been looking at Piezo drivers lately. They are effectively 0->100v output amplifiers with 0->10v input. Which can source ~60mA, at a few KHz. The drivers I've seen mostly use high voltage opamps ...
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2answers
93 views

Managing CRT dangers for student hobbyists

What are the main dangers of breaking down or tinkering with CRTs? From my electrical engineering background, I understand that typical CRT designs include very high capacitance that can be dangerous ...
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2answers
69 views

Can Cockcroft-Walton circuit be multiplicative instead of additive? [closed]

The Cockcroft-Walton voltage multiplier can be used to increase an input voltage, for instance most commonly to double a voltage. However, adding on additional circuits would not continually double ...
0
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1answer
79 views

Variable vin AC to fixed DC power supply design.. Simplest And Small

Okay, so bare with me on this one please... First post on this stack and still refreshing my memory on electronics in general. So basically i'm working on a project which generates a varying AC ...
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2answers
108 views

Convert high voltage AC (10kV, 60Hz) to low voltage DC (5V)

Is there any easy and safe way to convert the high voltage AC (60Hz, 10kV, such as the voltage on the overhead line) to 5V DC that can be used to power up a micro controller (around 1W power)? We do ...
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1answer
39 views

Pulse Supply Ground Reference

I am currently working on a high voltage supply for short (50-100ns), quick (<30ns rise time) pulses. The below circuit is my first rough draft for the power supply, I realized that by connecting ...
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1answer
141 views

How to make an electrical spark generator for as an ignitor for explosives?

I wanna make an explosive launcher. there is an explosion capsule and a long pipe to help the explosive go straight forward. the fuel is alcohol or butane. no difference. and they both need a short ...
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0answers
63 views

Cockroft Walton vs. negative ion generator

Some days ago I made one of my first high voltage projects: I build a sort of little taser. It works thanks to a high voltage DC converter which has a 3 V input (I use two AA batteries) and about ...
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1answer
64 views

How long will it take to kill a MOSFET with heat?

Example; http://www.aosmd.com/res/data_sheets/AOK42S60.pdf With this; http://www.irf.com/product-info/datasheets/data/pvin.pdf As I was taught in another question, the 40nC gate charge being hit ...
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4answers
3k views

Why are consumers located near high-voltage lines typically not connected to those lines but instead are connected through a lower high-voltage line?

A typical grid uses 110..500 kilovolts lines to deliver electricity to substations which lower that to 6..20 kilovolts and then lines with that lower voltage get to consumers where yet other ...
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2answers
99 views

Protect 555 timer from high voltage

I built a circuit which I strapped one electrode to the bottom of my shoe, and the other to my leg. This circuit consists of a high voltage DC supply in my pocket driven by a 555 timer. When it works, ...
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2answers
140 views

Convert 6 volts dc to 300 volts dc

I am trying to build a portable Geiger-Mueller tube that is run on 4 AA batteries. However, the tube runs on 300 volts. What is the most efficient way to do this. I have looked for transformer that ...
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2answers
147 views

High voltage to TTL conversion

I'm designing a circuit that is going to sense the existence of high voltage DC(400V+) via microcontroller. I've already designed it for AC voltage using an optocoupler; however, I will not able to ...
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0answers
50 views

How can I experimentally determine the breakdown voltage of air using FEMM simulations

I have setup a rod-plane gap scenario in FEMM as shown here: and here:. I understand that the breakdown voltage of air is 3kV/mm and therefore have set my conductor to be at 4kV for the simulation. ...
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0answers
51 views

What would be some solutions to prevent system malfunction after IEC 61180 4 kV and 6 kV tests?

My team of engineers are developing an energy analyser that have to be submitted to the 6 kV transient tests of IEC 61180, Table 1 Line 8 and 4 kV fast transients tests, Table 1 Line 9. When we were ...
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1answer
95 views

Testing 4kv supply

I need to test if the trigger coil on my strobe circuit is working or not. But it has a 4kV output. How do I test such high voltages?
3
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1answer
199 views

Can multiple IGBTs share voltage?

I'm building a solid state tesla coil, which requires me to switch very high voltages at high speed to achieve resonance. The problem: I can't find any IGBTs that can switch the voltage I need. In ...
0
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1answer
95 views

Can 0V from an isolated source arc to earth ground?

I have a high voltage bus bar (~300-400VDC) that is powered by a variac. This sits in a case that has other electronics that are powered by a step down transformer (120VAC to 24VAC, then rectified to ...
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1answer
63 views

Switching 150kHz mains for an LC load

I'd like some input on whether or not to use a mechanical relay or some form of SCR setup to change the capacitance in my LC circuit that is currently operating at around 170V, 1A at 150kHz. (Not ...
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3answers
88 views

Why does this kit only support 24V

However this question may seem naive, it is still something that worries me. I bought this twilight relay kit (to turn on/off my home entrance light obviously). Thing is: The guide shows that it can ...
0
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1answer
102 views

How to detect if a high voltage fuse is blown

I have a 150A fuse on a 100A @ 400V nominal battery pack. There are 5 service relays and 2 isolation relays (one on each pole) in this battery pack. I'd like to make sure that none of these relays can ...
2
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2answers
137 views

What is the source of leakage current thru an isolation transformer?

I want to use my oscilloscope to check the cleanliness of the output a high-voltage power supply (electrophoresis type, up to 3000 volts DC). I built a 100:1 voltage divider (out of 2 resistors - ...
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2answers
61 views

Negative Bias from Voltage Regulator

Can the voltage regulator from here, Figure 6 be used to supply a negative bias to an APD? Would inverting Vin/GND do the trick or could that damage the IC?
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4answers
278 views

What will happen to a transformer if rated output voltage is injected to the secondary terminal?

I believe that I have a three phase delta to single phase transformer 1Kva with input 415 v three phase and output 230 Vac single phase. ( Someone help me to identify what kind of transformer is ...
4
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0answers
2k views

Why DC is not used for long distance voltage transmission? (Tesla vs Edison 2015) [duplicate]

It seems this question has been marked duplicate but I believe the answers given here is much more in detail. Why we are still using AC voltage for long distance voltage transmission. As we know with ...
1
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4answers
118 views

DC/DC overvoltage problem

I am using a 12V to +-5V NMH1205DC converter. When I measure the output voltage without a load, it measures about +-8V. This converter will power a low current circuit that contains several OpAmps. ...
2
votes
1answer
479 views

Best Option for Charging a High Voltage Capacitor?

I was looking for a good option to charge my 450V 6800uF Electrolytic Capacitors. I initially followed the dc - dc booster path with a voltage divider comparator (op-amp) something similar to But ...
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2answers
100 views

Modifying HV supply for digital control

I've built the HV supply shown above (from here http://desmith.net/NMdS/Electronics/NixiePSU.html). And it works great. I would now like to be able to digitally control the output voltage. This is ...
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2answers
122 views

No output from Transimpedance Amplifier

I'm trying to set up a transimpedance amplifier reading the response from an avalanche photodiode (Hamamatsu S12572-100P http://www.hamamatsu.com/resources/pdf/ssd/s12572-025_etc_kapd1043e03.pdf) and ...
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0answers
36 views

high voltage carrier for 12 volt charge - any thoughts?

I've got one for you folks, which I can't seem to find any info on. what is the effect of high voltage AC (say 2kv), low current, on a 12 volt lead acid battery? Danger of the spark igniting the ...
2
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1answer
241 views

High Power H-Bridge with IR2125 Drivers Problem

I'm currently stuck on a problem when trying to drive a 140V DC motor using an H-Bridge with 4 high-power mosfets and 4 IR2125 drivers. I'm using as input to the drivers a signal generator of 5V in ...
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1answer
57 views

Voltage stepping and current reduction

I'm designing a drone to use a relatively new form of propulsion, electrostatic fluid propulsion, which requires extremely large voltages (in the order of 10-100kV) running through a wire to ionize ...
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0answers
108 views

APD bias discrepancy

I've built a PCB based on the voltage regulator design proposed here, Figure 6, which supposedly should result in a 30-90V output. However, the maximum output bias I measure is about 48V, which is ...
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0answers
139 views

Driving high voltage MOSFET H-bridge

I am looking for suggestions on MOSFET transistors and logic for driving high voltage full H-bridge from a 5V PWM signal. I have a microcontroller that outputs a PWM signal 0V->5V. And with this ...
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0answers
111 views

Simple way to design an electrical bug killer

I've been asked to design a device capable of killing bugs, like roaches. I have looked all over the Internet for circuit designs to no avail. I was hoping someone could tell me where I could find a ...