Search results for query: *

This monitor isn't the one picture in earlier posts #45 and #49. If this Keweisi is the one you have https://www.amazon.com/dp/B06X6K7NK9/?tag=pfamazon01-20 it lists specifications of: . Input voltage : 3.0 - 9.0V . Measuring current: 0.00 -3.00a Unloaded, the Jameco supply voltage will be...

Make a sketch of what you intend to do. If I'm following what you are saying I think the answer is no.

You are measuring 0.49 amps at 4.96V from the powerbank, and 9.1V at 267 mA output from the 5-9V boost converter to the Dylos load. 4.96V*0.49A = 2.43 watts 9.1V*0.267A = 2.42 watts These power values agree to approximately 0.5%.

You probably want to start another thread to discuss the inner workings of air particle testers. It strays far afield of the original subject of this one ("9V 0.5A battery pack"). I'd be in the same boat as you regarding answers on this question. The sum total of what I know about them was...

The powerbank probably hides direct battery voltage information in favor of a discharge status percentage. It is a DC-DC converter built around a battery, for instance, a 3.7V Li-Ion, and a specialized chip designed to correctly charge the battery and provide a regulated output voltage when in...

Given the age and possibly storage in a non-ideal environment, one thing to check before attempting major surgery is whether there is any corrosion, burrs, dried out lubricant, and/or dirt build-up at any of the pivot points, and sliding contact points in the mechanism. If so, it may be...

The meter leads are reversed, and account for your negative current reading. The (+) ammeter lead should be connected to the (-) lead from the battery pack, and (-) ammeter lead connected to the load.

My Maglight (LED version) has a sharp cutoff between low (yet acceptable) light output to completely off when the batteries are low. Computers do bad things when supply voltages are low; exactly what these bad things are depends upon the computer, but include memory corruption, locking up...

Within limits, yes. Provided that load power is constant (and speed setpoint isn't pegged at 100%), a DC motor drive in speed feedback will draw more line current as line voltage is reduced, and visa versa. No devices where line current remains constant as line voltage varies are coming to mind...

The only way to know for certain is to measure the two quantities of interest - voltage and current - and observe how they behave. That said, I'd expect current to fall off as voltage decreases, and hence power as well. Do you know anyone who has a variable voltage DC supply? If I had a gizmo...

Yes, the ammeter leads must have been reversed. No, it won't change the value from 270 mA. Cell voltage is in large part determined by materials used for the electrodes and electrolyte, and SoC (State of Charge; how charged it is). Regarding nomenclature, although it is common practice to call...

Read about battery tech at the Battery University. This article delves into battery run-time. Pay attention to the differences between low current draw and high current draw devices. https://batteryuniversity.com/learn/article/bu_503_how_to_calculate_battery_runtime 270 mA at 6.84V is 1.85...

"Perspective" was the first word that came to mind (at least, to my mind) that conveyed the essence of "Rth across R3". Perspective, in the sense of "the combination of me, and all those connected to me". By that definition, network resistance from the perspective of R1 is 700.75Ω, from R3 is...

I believe Tom has it nailed. Recently another poster had a question involving a 9V, 500 mA transformer-based unregulated DC supply so I have the specs for that on hand. It has a transformer, full wave bridge, and 1000 uF smoothing capacitor, and in that case delivers 9 VDC at 500 mA load with...

1. This looks like a homework question. It ought to be posted in that forum. 2. Is your simplification from the perspective of R3? When I calculate the resistive network from the perspective of R3 it works out to 1.161K

I know nothing of the minutiae involved in air particle measurements, and cannot advise on questions of accuracy comparisons.

If the battery pack open voltage is 9.8V, it will drop by some small amount (how much depends on how much load the Dylos provides) when it is powered up. Measure it. Study the Jameco power supply specs. Unloaded voltage for the test subject was 13.67 volts, and dropped to 8.95V when...

In post #14 you mention the Dylos DC1100 demands 5.1 watts. Is this value supplied in the user manual? Does your multimeter have a current range? If yes, what you could do is set it up for current operation, and measure what current the DC 1100 actually draws. A cheap and dirty way to make...

Do you have in mind a micro-miniature version of a toggle switch like those often used to turn lighting on and off? No, probably not. Electromechanical switches come in all shapes and sizes with a wide selection of actuation methods - everything from a small snap-action switch like this...

Do you mean 2 nanometers? From what I've been reading, the final carbon block filter feeding RO membrane cartridges in these home RO systems is often rated 0.5 or 1 micron. I've been trying to understand RO filter membrane specifications, but with mixed results. I had been expecting in part...

That you can hold your fingers in the warmed water stream suggests it isn't even to 60°C (140°F). Unless water temperature rises enough to be a scald hazard it isn't something to worry about. I'd note the UV disinfector manufacturer takes into account the effect of water temperature rise after...

How hot is the water? Boiling hot? A quartz tube is capable of enduring higher temperatures than ordinary glass, or even borosilicate glasses like Pyrex used in lab glassware and home cookware, so I wouldn't worry about it. https://en.wikipedia.org/wiki/Fused_quartz

Quite often, yes. If you know the bulb manufacturer and part number, see if they provide warm-up curves. This one courtesy of Magnaflux is typical. https://www.magnaflux.com/Magnaflux/Resources/Blog/NDT-Stabilize-vs-Warm-Up

Not offhand, but you could: 1. Install a female-to-female adapter with 1/4" press fit connections on both sides, 2. Get a small roll of 1/4" tubing and replace the tubing segment, or, 3. Simply leave the high pressure switch in place. Disconnect the two wires going to the switch contacts, and...

True enough, but providing a fast stop under unloaded conditions improves safety. I don't recall the particulars, but for industrial systems OSHA requires certain types of machinery (pull rolls, rotary presses, and the like) to stop completely within a rather short travel distance after the...

Does your UV unit use a gas discharge bulb similar to a florescent light? If so, perhaps the thing to do regarding pressure or flow-based UV on-off control is nothing at all. Went looking around to see what power/cost savings are involved, and ended up reading the manual for a CrystalQuest...

How long after turning on the faucet does the booster pump kick on? If it is nearly immediately, then one option is to wire a control relay coil across the pump motor terminals, and use normally open relay contacts (which will close when pump motor is running) to control power to the UV unit.

According to the drawing, when switched to 'on', current flows through the motor armature and heavier windings. When switched to 'off', this circuit is broken, and motor armature is connected through the lighter windings through the closed switch element and would act as a dynamic brake. When...

The pro of using a pressure switch in this application is they're readily available and relatively cheap. The cons stem from using pressure as a proxy indicator of fluid flow. With no flow, pressure at the faucet and UV unit connection will rise to pressure at the cold water supply, so long as...

I've never seen a pressure switch in series with total flow, but there it is. Scratch the differential pressure idea; it seems they've incorporated a traditional one-port pressure switch and tee into a single casing. The part in the eBay link is rated 0.25 MPa (36.3 PSI) +/- 0.02 MPa (+/- 2.9...

Thanks. That reference to a SoleAqua QF-HP22 to helps a bit, but not enough. [Begin mini-rant] Is it just me, or is product literature becoming abysmally useless? This is the sum total of their specification page. At least it gives a water pressure of 35 to 40 PSI, which I'm assuming is the...

Does this system have a drawing showing fluid paths, or could you sketch out where this pressure switch is plumbed into your system? The Amazon listing calls it a "PureSec 2017 HPS14TUX2 quick fitting high pressure switch for tubing OD 1/4" used for RO system". Does this switch have...

1. Yes, if it is a simple resistive heating element, and is connected to 240V supply voltage. 2. Probably, if it is a variable output soldering station, and connected to a 240V supply. The only potential difficulty that would have to be ruled out might be with a TRIAC or SCR power controller...

Are you talking about screws for ground bar(s) like the 15 terminal SqD part #PK15GTACP pictured below? I've never seen screws for them sold separately, but that's not to say they aren't. If refurbishing a load center it is best to replace the bar(s) with new parts - the aluminum threads...

Use an audio amplifier as suggested in post 6 and 7. Many years ago an article in Steve Ciarcia's Circuit Cellar Ink had plans, and the theory for building a simple EEG called the HAL-4. Many of the signal processing issues are applicable, but I couldn't find it online. Instead, found an...

Maybe so, but probably not. 1. Long term diesel storage is less problematic than gasoline (especially gasoline-alcohol blends) because it consists of less volatile hydrocarbons. Even so, and even when treated with biocides and stored in full containers (to limit oxidation, and condensation)...

Can't say how fast will be safe. A lot of this is determined by granulator design - what the bearings can handle, how much impact force the blade hold-down bolts can successfully clamp against, maximum ratings of various power train components (such as V-belt sheaves), and so on. 600 RPM is...

It is a good idea to label all numbers with their units for clarity. If 2318.4 is pounds of force, and 0.3535 meters is radial cutter distance, then how can 819.5544 be in meter-kg? I've the same question about requiring 2000 RPM as @anorlunda. My experience is with plastics granulators, and...

Depending on budget and city water supply quality you might consider installing an adequately pressure rated Y-strainer after the mains shutoff. A #40 to #60 screen will block bigger stuff from getting into the regulator, and reduce dirt load on the finer filter element. If you opt to use a...

Sorry about that. Seems I missed the final 'l' in html. https://www.qsl.net/g3oou/reform.html

If an electrolytic has been sitting on the shelf for a couple of year or more it's a good idea to connect it to a current-limited supply, and gradually ramp it up to rated voltage. Look up "capacitor reforming". https://www.qsl.net/g3oou/reform.html gives the general idea. A number of VFD...

The way a SMPS (Switch Mode Power Supply) operates makes it possible to allow a wide range of AC input voltages. Output voltage is up to the designer. 12V is often seen because a lot of devices use it, but it can be whatever is needed, and often several discrete voltages are generated. Your...

I'm not seeing the need for completely ripple-free voltage. The Meanwell GS25E05-P1J is a switching power supply rated 5V, +/-5% load regulation, 0 to 4 amp output with up to 50 mV peak-to-peak ripple/noise. The spectrometer requires 5VDC at 1 amp. Wouldn't any commercially available USB...

Mose bandies biological words about, but even if they aren't technically accurate (science has advanced since the early 1960s ;) his observations remain valid. Coaxing Tesla coils to musicality has to count for something. Not the group I was looking for (a quartet, if distant memory...

Do you have an electrical schematic of the power and control circuits? Is it necessary for it to run on both 400V/50Hz and 460V/60Hz, or will it remain at 460V/60 Hz? There are several ways to go about it, and balancing the best vs. least expensive ways becomes the question. 1. Plug it into...

Wish I could help, but the closest I've come to nuclear is working with Betamike gauges using Strontium-90 sources.

Can you borrow a voltmeter from someone at the worksite, or enlist their aid for a couple of minutes? Measure voltage at the coffeepot outlet with the pot turned off. While continuing to measure voltage, turn the pot on and observe how much the voltage droops. If it drops a lot, then a larger...

One good thing about having several different temperature scales is it provides handy, everyday examples when teaching motor drive, and other types of process scaling. What I wish is Celsius considered "200" the boiling point of water rather than "100". That way, it would have preserved (and...

What is your power factor now? Double check with your power distributor they indeed require a leading power factor. It seems an odd request for the reasons offered in posts #2 and #3. Perhaps they instead want the power factor between 0.95 and 1.0, lagging or leading.

Yes, it is possible to shift level from 5V to 24V with an optocoupler, but why bother if you don't need to? It comes back to carefully reading the manuals of the PLC you intend to use. Don't know about the Siemens S7 line, but it appears even the low end Mitsubishi FX (model FX3S) has built-in...