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246 Threads found on edaboard.com: Voltmeter And
hi, The 7660 is there to provide the -5v. Have you seen this option,? E
For making these measurements on an HF receiver, a true RMS voltmeter is needed which I do no have. Can I measure True RMS on the HP54520A and how?
I am currently ordering parts/building a grid charger for my 2000 honda insight hybrid. I already have what I need for the charger, just would like to have something built into the charger to monitor the voltage and amps of the circuit while charging. There are some meters I can buy on eBay that measure in the required range but I do not like how t
* Attach ten led's to a 3914 IC. Turn it into a house voltage monitor, or vehicle voltmeter. (This inexpensive voltmeter displays momentary cranking voltage. Ordinary voltmeters respond slowly so you can't be certain how low the voltage dropped.) * Stroboscope made with bright white led and 555 IC pulse generator. * Stair (...)
After the parallel resonant frequency, you may find a series shunt resonant frequency at the 1/4 wavelength with no signal using an RF sweep. yes I too was wondering HOW LONG that cable was with the high impedance voltmeter trying to measure it? The line IS a transmission line, and will behave like a trans
The LM3914 is a linear voltmeter but the LM3915 is better for measuring the logarithmic relationship of loudness with our hearing. My circuit uses a peak detector and its LEDs do not flicker, they show the exact levels of sounds. With no sound all my LEDs are off. With loud sounds all my LEDs are on at the same brightness. Half levels cause half th
Hello, I have found this little powermeter and I like it because it is passive and it has a logarithmic scale. I want to alter it to a "selective voltmeter" or "wave analyzer", for the HF radio amateur bands, so that I can monitor the different harmonics levels. I believe this can be done with
- There are undefined power supply sources e.g. XWM2. Multisim clutters its schematic by cutting wires and inserting a current meter. XWM2 has a voltmeter and a current meter, it is not a power source. Multisim also clutters its schematic with chicken pox dots all over the place.
PCB layouts like that don't work at high frequencies. The tracks work as inductors (think of them like a coil that has been un-wound) and as the frequency increases the amount of effect they have on the circuit becomes significant. You also have a problem with the orientation of the two coils, when they are close to each other and aligned the same
The batteries can read okay on a voltmeter but then lack the power to drive a load. They develop internal resistance, and this reduces how much Amperes they can put out. From my experience with a backup UPS, the batteries only last a few years (whether they are used much or little.) Then they must be replaced. Often they are gel cells. These are n
Hi there, I?ve been given a lcd volt / amp meter to repair. See attached photos. The circuit board has burnt the track beyond repair. I have etched a new board and would like some help / advice. There is a small (8.5mm * 12.5mm) component which I cannot identify. It originally had 6 legs although 1 was removed at time of fitting. The original su
Hi forum, I want to simulate home wiring into Protues 8 SP0. I have 230V 50Hz system. I want to simulate Simple Home Light Bulb, Tube light and Ceiling Fan. So first I just picked up Alternator from "Simulator Primitives" and placed AC voltmeter across it. I have set Amplitude = 230V and Frequency = 50Hz for Alternator. (...)
Are you looking at this with a voltmeter or an oscilloscope.
Hey,I would like to implement a digital voltmeter with PIC16F877A and an 16*2 LCDbut the conversion is not succeeding,the voltmeter has to measure 0-30VDC but I am not getting good values. Could you please help see the codes here below:#include <16f877A.h> //Header declaration for pic used #DEVICE ADC=10 //definition of ADC bits for conv
It depends on the resistance of the wires and the sensitivity of your voltmeter. At 1mA, the voltage drop across the wires is only 1mV/Ohm and you have stated the resistance is less then 1 Ohm already. You are heading into the problem of being able to measure small voltages instead of small resistances. You might get more accurate results (...)
hi, Is the ETS kit +/-15V supply referenced to the GND as shown on the +/-5V supply.?? Use a voltmeter and check between GND and +15V and also -15V, make sure that you have +/-15V relative to the GND pin. E
Hi I will build a high voltage (20kV) voltmeter using an ordinary 220V voltmeter series with a 20pF capacitor. My 220V voltmeter is calibrated and works good. So I must only change it?s calibration factor for 20 kV. Capacitor impedance is about 113MΩ at 50 Hz. So I calculate calibration factor for range about 1-20 kV (...)
Hi. Having a trouble-shooting problem with a home-made voltmeter which reads the output voltage of a power supply. The power supply transformer has two secondary windings, so there are two DC supplies that cover +5/6/7/9/12/15V outputs. Both supplies, and the soldered voltmeters and ammeters worked fine when I was (...)
I'm designing a voltmeter and current measurement system that forms part of a electronic load. Lets tackle the volt meter first. I'm using a 16-BIT ADC (AD7708) and want to measure the following voltages see below, the ADC is pretty neat for DC applications and is used in the BK8500 instrument. Here us what I want to (...)
Hi! Could somebody tell me what mistakes I may have made in the layout (and possibly reasoning/understanding, especially of the OpAmp) for this circuit please? I've omitted external components for both ICs which would clutter the schematic and are not an issue. The 0.01 Ohm resistor and trimpot are just an idea (maybe a (...)