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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for July 28th, 2020

Using LEDs as mains indicator lights on 120V and 230V (live demos) – YouTube

Posted by jpluimers on 2020/07/28

I love the “bigclive” YouToube channel: it is full of neat ideas, and wise tips on disassembled electrical gadgets. Most of his videos involve soldering or/and making schematics of the things he tears apart or builds.

This one is on Using LEDS as mains indicator lights on 120V and 230V (live demos):

Modern LEDs are bright enough at low current to use as directly mains powered indicators with minimal circuitry. The slight downside is that with a simple resistor circuit the vast majority of the power gets wasted as heat. But the current is so low anyway that it doesn’t really matter. Here are some simple ways to drive LEDs from 110V to 240V with minimal circuitry. I tend to recommend running resistors at around half their rating at worst as it means they will last a long time and not discolour too much with age.

His [WayBack] web-site is very small and shows some of his projects.

You can follow him on either youTube or on the the BigCliveDotCom reddit channel.


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Posted in Development, Hardware Development | Leave a Comment »

Why Rubber Ducking is good

Posted by jpluimers on 2020/07/28

I like it when people find out that Rubber Ducking is a good thing.

Read the story at [WayBack] … I’ve read about ‘rubber ducking’ and thought of it as a good thing, but I never really use/did it. Also I knew that SO showed me the value of MCVE,… – Mike Torrettinni – Google+


Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »

Duh moment: when is querying your DNS infrastructure and it appears to be uptimerobot

Posted by jpluimers on 2020/07/28

From the hindsight department [WayBack] Nice when someone in Dallas using is querying your DNS infrastructure for many permutations of domains…… – Jeroen Wiert Pluimers – Google+.

Wolfgang Rupprecht gave me some hints on the cause, as the IP address Google Search used to be of a gaming server: [WayBack] TwotailsTikat’s Profile – Member List – Minecraft Forum

After a good night sleep,

# nslookup name =

In retrospect: perfectly normal behaviour for monitoring machine “snip”.

Log by


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Posted in *nix, DNS, Internet, Monitoring, Power User, Uptimerobot | Leave a Comment »

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