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The most recent discussions

HVDC underwater connectionof Crete to Greece mainland

August 2, 2020, 11:09 am

A few weeks ago the contracts were signed for this connection, from Crete, to Attica, 2 underwater cables, length 500 km, 500 kV, HVDC.It goes without saying that the inhabitants of the Damasta v... Read more »

Rhode & Schwarz - Website Down?

July 29, 2020, 1:10 pm

Hello, all. I haven't been able to access the subject's website for 2 weeks now. Assuming the problem isn't on my end why would a major supplier of test equipment allow this? Thanks for any in... Read more »

Voltage regulation on very old distribution circuit

June 5, 2020, 4:05 pm

Consider in the rural US, a very old section of a distribution circuit, operating at 4800Y/2770 volts delta. It is fed through a wye/delta transformer bank fed from a 13.8 kV distribution circuit... Read more »

Power Factor Correction

March 9, 2020, 11:38 am

Hello, all. I'm an EE by trade but have never worked with, nor designed, AC power distribution systems. On overhead medium-voltage (say up to 69 kV) lines one often sees banks of subject capaci... Read more »


February 24, 2020, 12:02 pm

Figuratively speaking the rise decided by the run needs reworking. -- CDI #0M39344 Read more »

Negative 48 Volts DC

  [ 2 ]
January 25, 2020, 5:24 pm

Is anyone willing to explain Negative 48 Volts DC? I'm trying to learn about it because we're using it for a few things at work and I'd like to better understand what we're working with than sim... Read more »

Re: OT. Antenna tester

December 11, 2019, 11:41 pm

@mid.individual.net: Pretty smart little presentation sheet. Cool job. Read more »

Jacobs ladder variable frequency and duty cycle effects

December 3, 2019, 8:46 pm

https://www.youtube.com/watch?v=Uh_Df8tsH4M Jacobs ladder and the effects of frequency and duty cycle. -- We all have dreams. Is yours worth pursuing? Read more »

Jacobs ladder in the dark

December 3, 2019, 8:46 pm

https://www.youtube.com/watch?v=Ll8guReWvFQ Jacobs ladder in the dark -- 'Such is life' - Ned Kelly's last words upon being hanged Read more »

High voltage demonstration

October 29, 2019, 6:09 am

This is a high voltage demonstration using an inexpensive car ignition coil being driven by a variable frequency, duty cycle and amplitude 555 based mosfet circuit. Circuit schematic: https://w... Read more »

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The best rated discussions

Unsolderable wire?

rating: 5
  [ 2 3 ]

I am trying to solder some RG-6 shield to a pcb. The braid won't tin. It's almost like it's dissipating the heat faster than I can apply it. With both a temp-controlled iron (set as high as 700F)... Read more »

Help with circuit diagram please

rating: 5

Hi I have a slightly unusual project I wonder if someone can help with. I need to customise a guitar to include 20 4.8v 3A torch batteries. They will be powered by 2 4.5V Alkaline batteries, the tric... Read more »

resistance of a tungsten filament?

rating: 5
  [ 2 ]

When a tungsten filament is giivng off light, does its resistance vary significantly over a voltage range from 100V to 130V? On our pro video list we've been having a discussion concerning current fl... Read more »

Excessive brush wear on DC motor.

rating: 5

Greetings! We have a field excitation DC motor on our SAMP machine. We are experiencing 1 brush on the DC motor to be wearing out a lot faster than the other 3. (My understanding is that the brush t... Read more »

200amp Service - Wire pulling

rating: 5

I'm building a new shop ( no metallic connections ) about 150' from my house. The shop will have a new 200amp service panel and I'll be feeding it from a 200amp disconnect panel at the house. My qu... Read more »

supply for old audio transistors (driver transistors: 2SD381 / 2SB536)

rating: 5
  [ 2 ]

Hi, I find it pretty hard to find a shop that actually understands what one is asking for... I my case most of the shops I called up they did not even know the amplification class of their transistor... Read more »

South Korea 380V Power line colour code

rating: 5

Appreciate if anyone can help me. I am looking for information on colour code used in south Korea 380V 3 phase power line. I am used to the BS standard that is red, yellow and blue phase with neutral... Read more »

Actual Ampacity Rating ROMEX SIMPull Type NM-B in a residential attic.

rating: 5

Please help me keep from tearing my hair out. I am installing a subpanel in an existing, small 22 by 8 foot (176 sqft) addition to my home. The original wiring was not done to code and has since b... Read more »

How do I connect PTs and CTs for 400A 3ph service

rating: 5
  [ 2 3 4 ]

Usually the utility does this but this time it is for information metering an we will do it. It will be a type A 2 1/2 element meter with CTs and PTs. Seems to me I remember that the dot on the CT d... Read more »

conduit fill - romex?

rating: 5

We're working on a kitchen renovation in a house built about 1900. The kitchen space has been gutted down to the studs and overhead joists and is nice and easy to wire with romex. There are suffic... Read more »

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