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# High Voltage Divider

128 Threads found on edaboard.com: High Voltage Divider

## [moved] Circuit to detect 240 or 380 volts AC

Hi, everyone! I need to make a circuit that can sense if the mains voltage is 240 or 380 volts. In case it detects about 380 volts, a relay should turn on. I guess I need a way to measure the mains voltage. It doesn´t have to be precise. Can I rectify and filter the mains, and use a voltage divider to scale down the (...)

## Using an attenuator pasive probe with a spectrum analizer

a low frequency solution, like the X10 scope probe, will not work well with a microwave or even high frequency RF signal. I would NOT count on it being a 1/10th voltage divider either, since the spectrum an alyzer is a 50 ohm system, and a scope is typically a 1 Mohm system. I would put a 20 dB 50 ohm attenuator at the spectrum analyzer (...)

## overvoltage protection in inverter voltage sensing

I am working on 3 phaseAC machine inverter. For measuring the motor phase voltages I use the following circuit 135315 In my project the op-amps supply voltage is +/-5VDC; the inverter module supply voltage is +15VDC. These power supplies are deried from an isolated +5VDC supply. So the op-amps and the inverter module (w

## Biasing High Pass Sallen-Key Filter

My mistake, only one voltage divider is needed to make the half-supply bias voltage. The filter capacitor for it must have a high enough value for it to be almost a short circuit at your lowest frequency. Your biasing for the lowpass filter is correct.

## voltage divider without power losses

If you want it done with 0.00% loss, that's easy. Quit now. Resistive dividers have not only the inherent loss, but a dismal consistency of output relative to loading. Only a high-Z load would make any sense for using that. Depending on how many different voltages and how many at once, a multi-tapped xfmr with switches could be viable. (...)

## Power supply build query

A transformer provides isolation so that you do not electrocute yourself. The drill requires a high current. A voltage divider supplies a low current. Why don't you replace the battery?

## AC voltage measurement without transformer issue

No AC source is actually floating, and most likely you don't want to operate your circuit directly connected to the mains. A suitable solution for most applications is a high impedance (e.g. 1 Mohm to 10 MOhm) differential voltage divider. It involves some leakage current, but low enough not to trip any RCD protection or to expose (...)

It probably has more to do with the writer not being fluent in English. Basically unless the know resistor is a high precision resistor (e.g. 0.1%) then your accuracy will vary according to that known precision. If you use a 10% resistor you won't get better than 10% accuracy in the unknown resistor value and if that unknown resistor is off by 10

## Frequency and current measurement for AC and DC Voltage using PIC16F1937

Assuming you are using 5V VDD and 5V as the ADC reference: 1. Use a 10:1 potential divider. If the current into the divider has to be very low (=high value resistors) follow it with a buffer amplifier. 2. Depends on the response time you need but simplest method is to convert the AC to DC and use a potential divider for the (...)

## LEM LV 25-P output drive

Won't consider AD817 as general purpose OP. Like other high bandwidth OPs, it has larger output current. But the OP would get quite hot. Still think that a passive resistor circuit is preferable.

## Link an inductiv sensor to a microController

If the sensor has an internal pull-up to 12V, try to adjust the high level voltage with a pull-down to ground, e.g. 2k.

## how to get Two Dc Outputs alternately

Dear, I have two output from two transistors. one output is of 300V for 180 microseconds and other output is of 9V for the remaining high pulse. How can i combine these two outputs. The problem is 300V, otherwise i would use comparator circuit for this problem. Could someone help me out. I'd really appreciate his/her effort. Thank you

## Can polarised electrolytic capacitors be used to make high/low pass filters?

I want to make a SIMPLE low pass filter for an audio circuit, something similar to this: I have some ceramic caps but they are low capacitance so I have to use high value resistors and then I get no sound (current too low?) Could I use electrolytic capacitors to make

## High Voltage Solar Dusk to Dawn system.(500V to 1000V represented as 0 to 10V)

Hello, I have 500V to 1000V DC output from comibination of solar Panels. Is it possible to design a circuit which will represent 500Volts to 1000Volts DC range in 0V to 10Volts DC so that I can control my output device as per the voltage. Similar to solar dusk to dawn street light, but high voltage. eg: 500V will be represented as 0V (...)

## Adc value to LCD using Arduino

yep, AVRs common ADC has a recommended input impedance of no more than 10Kohm... that voltage divider seems a little to high...

I believe you know that +/- 35V is no voltage range for a standard OP. So you have essentially these options: - use an expensive high voltage OP - design a discrete buffer amplifier - use a passive voltage divider, similar to an oscilloscope input

## Output voltage swing of Voltage amplification stage

If you section the design into 3 stages; 1st stage is a differential input current amplifier with Vgain controlled by R2/R1 ratio =1 and serves to raise input impedance and control loop V gain from R3, R1 divider ratio. 2nd stage is a single input differential output voltage amp. with high V gain controlled by CC

## How to reduce voltage to meause it ?

You won't use "very high" resistor values. Microcontroller ADC inputs work best with moderate source impedance, e.g. 1 - 5 kohms.

## Designing circuit for providing isolation

A differential amplifier with symmetrical voltage divider would be also my standard solution. It should be mentioned that it involves a leakage current according to the common voltage between high voltage and measurement circuit. The circuit must be designed to tolerate the leakage current, e.g. with (...)

## How to measure voltage of above 10kV using an MCU

I am trying to find a way to safely sample a high voltage output which will travel from about 1kV to 20kV (ramp). I think using a resistor divider should do the job. I have been successful at 1 kV - 2 kV range. I am just wondering if just by using a high impedance resistor will do the trick. Any advise?