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366 Threads found on edaboard.com: Voltmeter
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?
1 bit sign 1 bit integer 14 bits fractional This sounds similar to a voltmeter IC whose readings go from -1.999 to +1.999. The amount of 9's may differ from my figure.
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
Mean Si5351? It's only a clock generator, essential function for measurement of generally complex antenna impedance is vectorial voltmeter. Or use impedance bridge is a simple method.
* 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 light (or (...)
Hi I would like to build a very simple mosfet voltmeter. Mosfet, so that it does not load the measuring circuit. It will use an analogue meter. Can I use the 2n7000 to build this ??? What if I want to also measure negative voltage as well? Shall I just connect the ground to the gate and the ne
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 datasheet for the TSOP1738 recommends a 4.7uF capacitor to ground at its pin 2. The output is shown as the collector of an NPN transistor with a pullup 80k resistor to Vs so maybe your voltmeter has a resistance too low. They show an optional 10k pullup resistor. Maybe you have a source of IR nearby. Maybe your TSOP1738 is a fake or is defec
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.
today i devlop 7 segment based vlotmetre for autometic voltage stabilizer . for more details pm me on
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
For simple voltage monitoring, consider a bare lcd voltmeter. $10 or $20. Make sure the description says it can measure its power supply. (Some meters cannot do so.) It draws miniscule current. Put the correct resistor divider across its input wires, so that it gives voltage readings in the range you wish. Tip: Do not allow it to be exposed to ba
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
Please give a solution of random numbers display on tc7107 using circuit from datasheet.
i have both led voltmeter. can i use this voltmeter as ammeter by connecting in series?.:sad: it's not working when i connected
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. But I got 162V in meter.