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The most recent discussions

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 »

iPhone SUPER 80% discounts

April 19, 2020, 12:20 pm

*** iPhone SUPER-SPECIAL-DISCOUNT 80% OFF --- UNBEATABLE SUPER-PRICES !!! *** Save LOTS OF CASH on a wide collections of iPhones, 80% off everything must go to make place of next generation iPhone ... 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 »

(OT) AnonCoward - My home brew circuit; an adjustable coil driver

October 29, 2019, 4:36 am

Here's my video: https://youtu.be/KcWrrlTRFdM And this is the schematic to my circuit: https://www.imgpaste.net/image/r0yOs http://al.howardknight.net/?ID=157172565900 Now take a look at t... Read more »

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The best rated discussions

smps controller IC datasheet?

rating: 5

oem power supply, 31.5 vdc 1.5 A. I want to change the output to 24 v. There is one 8-pin IC, labeled: 230D1 PUICO I don't see a datasheet anywhere for this. Any ideas? Thanks, Dave 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 »

Wiring a contactor for Push Buttons.

rating: 5

I have a GE Contactor CR306Y1 with heaters that I am trying to wire for my motor starter. I understand how to energize the coil but can not find the other tap so I can integrate a start AND stop pus... 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 »

led belt buckle hack

rating: 5

Bought one of those LED belt buckles...not to wear! I want to hook it up to a serial line and control it from a pc. My hope was that there were some dev points on the board that I could tap into. ... 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 »

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