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.

learn more… | top users | synonyms

2
votes
8answers
434 views

Dangers of capacitors blowing up

I was wondering what kind of damage a 350v 6000uf (link to cap: http://goo.gl/f9iH29) electrolytic capacitor could do. will this kill me if it blew up next to me? I have never blown capacitors before, ...
0
votes
0answers
65 views

Can you only lower the breakdown threshold voltage of solid insulators once with high-voltage?

For example, insulator Z has a threshold voltage of 1000V. After exposing insulator Z to more than 1000V, its breakdown threshold voltage is now 800V. Can I lower the threshold voltage further with ...
-2
votes
1answer
65 views

Use Transistor As Mosfet [closed]

I want to make mazilli ZVS Flyback driver based on this tutorial www.instructables.com/id/ZVS-Driver I needed IRFP250 mosfet for making it I cant find it locally.In the schematic picture they said ...
-1
votes
0answers
36 views

Need help reverse engineering a combined current-voltage feed power supply for an ion beam source [closed]

I'm currently trying to reverse-engineer (or at least make sense) of the arrangement of electronics i utilize on a FIB ion source in the lab i work in. The staff scientist who constructed it left 2 ...
0
votes
2answers
100 views

Mosfet not passing enough current using a microcontroller and 2 power supply

I have made this circuit: Ignore "high voltage circuit" is not used. It's a prototype built in a breadboard with jumpers, and i have a problem with the mosfet "IRL540N", is not passing the optimal ...
1
vote
2answers
84 views

wirelessly remote-controlled DC power supply with variable voltage

I need a remote-controlled (wireless) power supply, outputting between 0 and 10 volts and 0 and 2 amps, preferably DC. It should take 110v/120v AC as input. Its voltage should be controllable with a ...
-1
votes
0answers
60 views

Using Zener diode instead of spark gap in a Marx generator

I want to create a high voltage pulse generator powered by low voltage DC ; controlling the breakdown voltage seems to be a good idea , but ,i haven't seen any circuit of this online , so I'm guessing ...
0
votes
2answers
63 views

Need to control (fade in/out, not just turn it on and off) a 240 V heat lamp. Is this even possible?

I'm a MechE and i'm way over my head in a project i'm working on. i need to be able to send either an analog or PWM signal to a heat lamp to allow it to fade in and out from dSPACE via a Unity project....
1
vote
3answers
100 views

How to measure high-voltage and high-frequency ripple?

I have a ferrite transformer outputting 1.2kV RMS on it's secondary. I have added a diode to do half-wave rectification, and have added a sufficient capacitor (10nF) in parallel to deal with ripple. ...
-3
votes
2answers
79 views

ATMega on high voltage application [closed]

Yesterday I had an argue with an electrical engineer. I am a beginner software engineer. He say that a logical circuit( processors, microcontrollers) should never be trusted in risky applications. ...
0
votes
1answer
96 views

Should I open the CRT monitor?

I have a CRT monitor which I was looking to open to acquire CRT for a project I am working on. I know its probably not the best idea but I have taken some safety measures. They are as follows: 1) ...
3
votes
2answers
146 views

Measure high voltages with a multimeter

My multimeter is rated to 600V. How can I readily (and safely) use it to measure higher voltages?
4
votes
5answers
178 views

Can a Tesla coil's secondary wiring overlap?

I am building a small tesla coil just as a proof-of-concept using a bug-zapper circuit. I unwound some enamel copper wire off a transformer and put it on my 12 cm length x 2 cm diameter PVC pipe and ...
1
vote
2answers
35 views

understanding electrical motor and force

I am looking to drive an electrical motor to power a cart with some substantial weight. I want to power this with as simple a method as possible but want to maximise the force for it. I have several ...
3
votes
2answers
145 views

How to control over-voltage at high voltage?

Suppose we're using a voltage multiplier to charge a high-voltage capacitor (C Big in the diagram). If you significantly exceed the capacitor's voltage you'll ...
0
votes
1answer
17 views

How to use an ASY2400 Xenon Flash Unit

Background: I just picked up an ASY2400 Xenon Flasher unit from a local electronics store. I found this hookup diagram for it: I connected a potential difference of 12V to the board. +12V to pin J4 ...
0
votes
1answer
85 views

Constant Current, 1.5 amp, high voltage into variable load [closed]

I need to design a constant current 1.5 A circuit. Input: A 3.3 v, 3 mA, 1.5 millisec pulse. Load: Detonators, with total resistance starting at 80 ohms and increases to 160 ohms in 1.5 ms. ...
0
votes
2answers
65 views

High voltage DC current measurement by inductance?

I'd like to incorporate a few permanent ammeters in a 600V DC circuit. I've found all sorts of nifty panel ammeters, both analog and digital, but most are rated to less than a tenth that voltage. I ...
-2
votes
1answer
45 views

High Voltage Supply Use

I have some quires regarding High Voltage supply uses: Is there any power supply which can operate in the range of 90VAC-600VAC? If i have my high voltage supply in the range 300VAC-600VAC and i ...
-1
votes
2answers
40 views

Can I use this Emergency Stop Switch Push Button Mushroom Push Button 4Screw Terminal_K2 for switching on and off a 4500W 220V heating element? [closed]

Here is the link to the emergency stop switch - http://www.ebay.com/itm/NC-N-C-Emergency-Stop-Switch-Push-Button-Mushroom-Push-Button-4Screw-Terminal-K2-/272048010923?hash=item3f575336ab. Thanks.
0
votes
1answer
42 views

Boost a HV power supply from +1250 V to +1500 V

I'm designing a base for a photomultiplier tube using a recycled HV power supply. The power supply is an EMCO C12. The base has a 14 pin socket (to connect to the PMT), the EMCO C12, a DAC to program ...
1
vote
1answer
44 views

Negative voltage from positive output DC/DC

my DC/DC ( http://www.ti.com/tool/PMP10077 ) has 200 V output on pins +HV and GND. Can I get negative output by simply swithcing the meaning of output pins -> I will use +HV as GND, and GND as +HV. I ...
0
votes
1answer
45 views

Switch TENS unit between many channels

I would like to switch the output of a tens unit (one of those things that uses electricity for pain relief) to 8+ different outputs. I want to create an electro tactile device. The idea is to switch ...
-1
votes
1answer
46 views

How to reduce VOC of solar panels to match the MPPT of inverter

I will have an off grid solar panel system to run my deep well 5,5 Hp water pump. I already got 24 of 250Wp 36,3 Voc panels and 3 phase Delta VFD C2000 inverter/driver. for this system I need to wire ...
0
votes
1answer
42 views

Mechanical Contactor for High Voltage DC - Substitute with Semiconductor

To switch 1kV DC at 5A, I usually use a mechanical contactor (<- Wikipedia) that switches both highside and lowside of a resistive load. Any suggestions on a semiconductor (or non-mechanical part) ...
0
votes
1answer
97 views

Follower current source?

I need advice on a problem I'm having I need a follower to transmit an AC signal into a low impedance load which is the cathode of a triode but I also need it to be an adjustable current source to ...
3
votes
3answers
332 views

Op amp with transistor in feedback

I am currently looking for a high side current sense IC. I have noticed that most of them that are without galvanic separation, are using an op amp with bjt transistor like in bellow schematics: ...
1
vote
2answers
36 views

Power Transformer with two Buchholz relays

In my workplace we have a power transformer, on its conservator tank there is a device like a Buchholz relay and its named as Atmo-Seal. What is the purpose of this device?
0
votes
0answers
38 views

High voltage reading isssue

Here i am attaching old and new schematic for reference.While designing the old board i have made mistake keeping HV- (j14) as common ground reference . J14 and j12 are connected with high voltage 0-...
1
vote
2answers
92 views

Earth resistivity meter design

I would like to design an earth resistivity meter for use in archaeological surveying. This is essentially a current source placed in the ground and a ohmmeter to measure the resistance between the ...
0
votes
0answers
56 views

Protoboards for high voltage

What are standard practices for organized prototyping at high voltages? A typical 0.1" pitch protoboard might be good for a few hundred volts. But as voltage increases I assume those boards are ...
0
votes
2answers
75 views

Need approval of transformer driver design

I designed a circuit from several ideas I saw before and I'm a bit too impatient to build the thing myself. (http://imgur.com/KD97NuJ) Basically, it's a two-transistor oscillator combined with an ...
0
votes
1answer
82 views

“Dead-man” safety switch for HV bench work?

Long-haul freight trains and other systems that required an alert operator for safety would often implement a "dead-man" switch that would shut the system down if the operator couldn't actuate the ...
1
vote
3answers
135 views

Transformerless BUCK SMPS for 1kV->12V

I have a challenge to push 500 Watts (15V) at 100 meters of telco telephone cable (0.088mm2, 28 AWG, 200Ohm/km, 500MOhm insulation). The only way to achieve this is by boosting the voltage up to ...
1
vote
3answers
215 views

Why does the cathode heat up more than the anode in an electric arc?

I have recently built a flyback transformer driver with a 555 timer, and have been drawing electric arcs. But I noticed that the cathode electrode(the HV pin on the transformer) heats up a lot more ...
2
votes
2answers
113 views

Jfet as HV resistor

I want a voltage controlled resistor for high voltages for a project I'm working on and using a common emitter/source transistor to shunt current into ground in order to get a desired voltage is not ...
2
votes
1answer
91 views

Differential measurements with high voltage oscilloscope probes

This interesting post about differential measurements with a scope has raised a few questions in my mind. I have read about true differential scope probes and they seem to be very expensive. Would ...
-2
votes
1answer
50 views

Drawing current [duplicate]

I read some where that an electronic device will only draw the required current for its operation but i dout a device working at 5 volt 500 mah will burn at 5 volt 3 amp source is this true or will it ...
1
vote
2answers
171 views

High voltage voltage controlled linear variable resistor

I have some high voltage (300v+) analog circuits that I want to control digitally which requires the use of a voltage controlled linear resistor that can withstand the high voltages. I don't expect ...
2
votes
0answers
118 views

High voltage DC offset servo

I'm working on a project and I need some assistance. I have an audio tube amplifier output stage that I need to have adjustable operating points while maintaining a DC null at the output. [![enter ...
2
votes
1answer
149 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
vote
2answers
57 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
votes
2answers
51 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 ...
-4
votes
2answers
59 views

How do I open a grill ignitor? [closed]

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 ...
-1
votes
2answers
92 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
votes
2answers
36 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, ...
10
votes
3answers
736 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 ...