frequency

frequency

Recent contents View information Top users
  1. L

    Low frequency humming noise in the apartment?

    Hello we have issues with a noise in the apartment. Believe it to be caused by some kind of a device that the downstairs neighbour has on 24/7. It's a very low frequency humming, causes vibrations in the floor. What could it be causing it? The noise resembles a fan or a car engine. There is...
  2. J

    Should the frequency of the square wave and the sine wave be the same?

    Hi all, I'm current doing an electrical engineering course and am currently having to use an oscilloscope in order to generate a square and sine wave from a sine wave generator with a 555 timer chip. When calculating the theoretical frequencies they are both very similar at 7Hz. However when...
  3. noidea

    Suspected extreme low frequency modulation

    Hi, I'm new here and this is my first post. I'm not sure how to explain what I'm experiencing but from my research I suspect my problems are coming from extreme low frequency modulation or some type of emp device. Other than physical symptoms I experience myself, some of the strange electrical...
  4. Brqchi

    Can voltage transformer and frequency inverter replace frequency converter?

    Hi. I live in Kurdistan(iraq). I bought these four devices from the United States: @BLENDER: 120V, 50/60Hz, 12A @food dehydrator: 115V,50/60Hz,600W @food dehydrator: 110V, 60Hz, 1500W @Vacuum sealer: 120V, 60Hz, 1.06A As you know Iraq's power is 230V-50Hz, So I have to change the voltage...
  5. tank

    Frequency without voltage

    Could anyone shed some light on what might be going on here, before I cut a trap in the laminate to find out. I have a dead socket on the end of a 2.5mm cable of unknown origin. L-E L-N N-E all 0 volts. Insulation resistance between the ends all 1000M Ohm. No continuity any conductor back...
  6. B

    Residential Fixed Wiring Inspection Frequency Question

    Hi, I'm looking for advice re frequency of Fixed Wiring Inspections in Residential Apartments. We have recently had a Fire Risk assessment in which the issue was raised. The block (14 Apts, all owned not rented), is about 5yrs old and the Domestic Installation Certificate for each apartment...
  7. Henryp

    High frequency lighting with low frequency fittings

    The bulb in my bathroom went the other day. It's a fluorescent 2d 4 pin that says 50hz on the fitting. I looked for a similar bulb to replace it, however none of them mentioned anything about frequency. When I received the replacement I bought, it had 50 to 60hz crossed out on the packaging and...
  8. DrFrankenBulb

    Anybody in Alamogordo interested in plasma, frequency and electro therapies?

    We need an electrical tek to help us set up a new amplifier/plasma tube system. We have numerous pieces of USA built professional gear. For the amp/coupler/tube we need help with, we have all manuals, specs, designs for convenience. Numerous health benefits (we also have botanicals on tap) tek...
  9. H

    how would i calculate the approximate frequency of the sinewave? see parameters below

    so suppose i have a single-pole (first-order) low-pass RC filter that gives me a unity gain upto the corner frequency of 1536Hz and i apply a 12V amplitude sinewave to the input of the filter and i am getting a sinewave with the amplitude of 4.1V from the output of the filter
  10. O

    Is frequency of 40 Hz light from Apple/Android tablet as reliable as that from an LED light?

    I am helping someone with Alzheimer's ; there is research showing that flickering light at 40 hz can possibly ameliorate symptoms. There are commercial 40 hz LED lights which flicker at 40 hz. There is also an app called Alzlife which has 40 hz flickering light. I have read that the light from...
  11. A

    Frequency responce analysis and bode plot function?

    Hi everybody, this topic is about a function you are probably familiar with in the audio repair field I need to use the fra frequency response analysis function for my repair application Recently, I tried to test the siglent sds1104x-e oscilloscope with bode plot function, which also allows...
  12. A

    EICR - Frequency of Test question.

    Just after a bit of advice, my wife's rental property had a new installation to 17th Edition in 2013 and in June this year had an EICR performed as a new tenant moved in. The same tenant is renewing their agreement for a further sixth months and the letting agency is saying that a new EICR is to...
  13. M

    Frequency power fluctuations

    Hello! What's the implications on frequency fluctuations on 3 phase power? From transformer to feed the lighting dimmer rack. We use Fluke power logger and recorded a frequency fluctuations from 50hz to 0hz in almost every 5 secs interval. It's random, different day and time. What may have...
  14. justcurioustwo

    can frequency changes effect the electrolysis process?

    A curious look at electrolysis After reading the quotes below which I got from another forum, I ask these questions ~~~~~ "Non-integer-frequency crystals will work well, as long as the crystal's frequency is between the microcontroller's maximum and minimum crystal frequencies. The non-integer...
  15. T

    Voltage and frequency conversion question

    Hi guys! I recently bought a record player from the US (its not available here). The model is the Pyle PNGTT12RBT It says its designed to run at 120 V 60Hz. I was a little confused on what the best approach would be to use it here without damaging it. I've seen plenty of voltage...
  16. joel89

    Fuji Variable Frequency Drives

    Hi all I have been told these are good drives for crane control? not used them yet but the prices seem a lot cheaper than the telemecanique alternative wondered if anyone had used them and or programmed them?
  17. T

    Royal Raymond Rife frequency generator

    Just throwing this out there to assay if anyone has done any work on the above or knows anything of it. Would be interesting to hear your views and thoughts if you have come across it or been involved in any way. I have been looking into this since around 2004 and attended a centre where this...
  18. A

    Current Frequency Counter - Wiring and Setup

    The current frequency counter we ordered on Amazon has just arrived, with a vague and minimal setup manual
  19. D

    Mains Frequency huge Variation

    Hi, on my mains I seem to be getting huge variations from the normal 50hz for several minutes at a time. It goes down to 48hz then back to 50-51hz and then will then jump from 51hz sometimes to 65hz but usually hover around 53-57hz for around 2 minutes at a time. This happens fairly often, what...
  20. UKMeterman

    Dno Hv Autorecloser Events Permitted Frequency

    Hi, I live out in the sticks, two independent HV Feeds from two separate primary substations with a pair of auto switches that control the single HV feed into the village. I have had 7 auto recloser events in the last 6 weeks, 3 of which in the last two weeks. At what point should UKPN get...

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top