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

-1
votes
2answers
33 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? [on hold]

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
36 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 ...
-4
votes
0answers
34 views

how to make high frequency toggling switch for household voltage? [closed]

I am a student who is under the project to make flash lamp produce UV pulse with duration of 1μs to 0.1s. I have to obtain it using household supplied current 220V. Is there any component which can ...
1
vote
1answer
27 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
35 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
33 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
34 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
88 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
317 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
32 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
32 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 ...
1
vote
2answers
66 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
45 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
0answers
34 views

How to safely connect valve apparatus to a PC?

I'm setting out to build the circuit below. It's part of a true random number generator, outputting a random analogue signal generated by a neon bulb. You can see that it runs on 200 VDC. Since it ...
0
votes
0answers
45 views

Controlling US power with Arduino

For a school symposium, I am creating a self regulating greenhouse (not really a greenhouse just a grow tent that is 3' by 3'by 3'). For the greenhouse I need to turn a pump, a light fixture, and a ...
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
76 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
116 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
160 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
96 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
66 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
47 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
118 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
102 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
129 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
50 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
49 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
54 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
79 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
727 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
votes
3answers
74 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
vote
2answers
37 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 ...
-1
votes
2answers
59 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
votes
3answers
165 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
votes
1answer
63 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
125 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
60 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
votes
2answers
215 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
vote
1answer
129 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
181 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
votes
2answers
55 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
vote
1answer
86 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
vote
2answers
62 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
votes
1answer
71 views

what means starting and Maintaining voltage in this specification?

i want to drive a pneumatic ejector(open and close), is specifications in following: ...
3
votes
1answer
101 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
vote
2answers
70 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
vote
1answer
157 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
vote
1answer
107 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
vote
1answer
156 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 ...