tag:blogger.com,1999:blog-88200789093459937262024-03-05T16:18:32.635+08:00Oliver Info SharingA place of learning records. Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.comBlogger230125tag:blogger.com,1999:blog-8820078909345993726.post-6648797497835548462023-05-12T11:41:00.003+08:002023-05-12T11:41:56.702+08:00EV / PHEV / Hybrid. Which one should one get? A big topic now for the EV era, especially for the ASEAN countries. Today, suddenly, my friend asked me whether 740Le is a worth buy? He means the 2017 model, with second hand price of around RM170k. Interesting topic, since we've been debating on EV, whether it's actually helping the environment or not, and it's not so affordable at the moment, with limited charge points and Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-71527785639754014122023-04-05T21:00:00.006+08:002023-04-05T21:00:59.868+08:00Age difference calculation Question: A was born in 1955. B was born in 1966. How old is B when A is 68 years old?How many ways to calculate to get B's age when A is 68? Answer 1: 1966 - 1955 = 11. (B is younger than A by 11 years) 68 - 11 = 57. (A is 57 years old when B is 68 years) Answer 2: 1955 + 68 = 2023. (It's in the year of 2023 when B is 68 years old) 2023 - 1966 = 57. (Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-25398529902173202372022-12-28T18:51:00.001+08:002022-12-28T18:51:24.378+08:00Not sure how to go on with blogging It's been a while, or rather quire a long while, that I've left blogging. Why? It's because there's so many websites with big teams doing the writing and journals worldwide. It's so hard to get any share of attention, or fans. Nevertheless, I feel there's a lost in human direction, when everyone is able to find or do a lot of things online by themselves. The world has gone too far. I also Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-16674679486613508702022-05-22T14:20:00.000+08:002022-05-22T14:20:02.445+08:00Monkeypox! Oh no... but let's be calmI'm pretty much happier and looking forward to be back to the normal life similar to 3 years ago, before the COVID-19 outbreak, but here I have to read another viral decease spreading. The Monkeypox. That's really a headache. However, after knowing it better, it's not as bad as the COVID-19, it seems. Let's trust the medical info. You may read more through this news source. https://Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-29622468718244844832022-02-27T11:22:00.001+08:002022-02-27T11:22:02.771+08:00Laptop battery balging issue Now I know why my HP laptop battery bulged up. It's due to prolong overheating effect inside the laptop enclosure.My system overheats all the time when plugged in to charge. I usually run my laptop the whole day as a desktop, using it for streaming TV and work in parralel, with and external monitor. It's cooler if run on battery. I use "Core Temp" app to check processor's temperature. Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-60493290498141055562021-07-12T13:55:00.001+08:002021-07-12T13:55:04.536+08:00Sinovac vaccine effectiveness? https://covid-19.kapook.com/view243852.htmlOne doctor in Thailand who's been given 2 doses of Sinovac vaccine has just been infected by Covid-19 and passed away. 😔 Debate now on how effective is the vaccine actually. Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-2495934828967125042021-06-28T17:02:00.005+08:002021-06-28T17:18:45.634+08:00Modern Web Builders (online) Looking back to those days when MS Frontpage was a tool for website building, and Tripot.com was one of the web hosts I used to use. Now, no more of them. It sees offline web development is not needed anymore, but online web building platform is. So, we have to keep up the tech trend carefully. Less HTML editing these days. Ease of building any website by newbies these days. Great! So, what Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-12189761472022063442021-04-21T01:34:00.001+08:002021-04-21T01:34:23.211+08:00Totem Pole PFC Power Supply Design (ref) A very detailed explanation on digital controlled totem pole PFC power supply. https://www.powerelectronicsnews.com/design-considerations-of-digital-controlled-totem-pole-pfc/Will need some thing to read it all. Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-2528662095923569152021-04-19T01:02:00.001+08:002021-04-19T01:02:29.231+08:00inductively powered LED designThis is a very interesting power transfer design. Using RLC circuit as channels to power up device through fraudulent controlled supply. Very clever concept. Nevertheless its inductively powered through pcb coil design. 👏https://youtu.be/3DeOPN1Cl1YOliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-88230047350558889792021-04-19T00:56:00.001+08:002021-04-19T00:56:58.230+08:00RLC band-pass filter design calculator (online) This is a nice RLC Calculator tool.I came across it through a YouTube video of inductively powered led circuit design. http://sim.okawa-denshi.jp/en/RLCbpkeisan.htmOliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com1tag:blogger.com,1999:blog-8820078909345993726.post-56247090184490455122021-04-14T20:23:00.001+08:002021-04-14T20:23:23.005+08:00EV Battery Specification This is a good write up to explain what's needed for EV batteries. https://www.allaboutcircuits.com/technical-articles/introduction-to-electric-vehicle-battery-systems/Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-87392944074639646742021-04-07T14:23:00.001+08:002021-04-07T14:23:50.532+08:00Electronic symbols This is one good reference for electronic component symbols. https://electronicsclub.info/circuitsymbols.htmOliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-24924173479834897872021-01-26T00:48:00.000+08:002021-01-26T00:48:10.315+08:00Colchicine a COVID-19 fighter?People have been eagerly waiting for vaccines to prevent the Corona virus COVID-19 infection. However, I think we should look for the most effective treatment as well for those who are infected. Cure and continue to live! And this news that I've just read is really a new light. Colchicine, if you've heard of it. I haven't, but I'm learning. I really hope this will save more lives from being Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-13910160196526278922021-01-23T18:11:00.004+08:002021-01-23T18:11:44.680+08:00Types of voltage divider circuits Most people would be more familiar with the voltage divider using series resistors. It's also known as Resistive Voltage Divider. There's a few more types of voltage divider. Namely, Capacitive Voltage Divider and Inductive Voltage Divider. Here's a good webpage explaining the differences of the said voltage dividers. https://www.electronics-tutorials.ws/dccircuits/Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-22438275616140999902021-01-23T13:32:00.009+08:002021-01-23T13:32:56.873+08:00Types of level / range sensorsRandom search for electronic kits, found lots of sensors packed with the kits on sales. Ultrasonic sensors are commonly used to introduce range sensor concepts. However, further search will find different types of range or level measurement methods. I found this video to present different types of level sensors nicely. https://youtu.be/bHxEXlIHSHYOliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-76660007863914094942021-01-22T15:29:00.001+08:002021-01-22T15:29:05.920+08:00Arduino Simulator Interested in programming the Arduino, but haven't had the opportunity yet. I got confused sometimes with the available options. So, have been reading around. Try to look for a simulator too, and today I found this website recommending a few simulators. https://www.javatpoint.com/arduino-simulatorRead through its first page on using Autodesk Thinkercad Simulator. I'll paste Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-39648155674817455592021-01-22T00:50:00.002+08:002021-01-22T00:51:56.839+08:00My 1st KiCAD 3D image Finally, I managed to draw a PCB and generate a 3D image of the board using KiCAD. Just simple use the Transistor Switch circuit from John Woolsey's tutorial. There's several netlist errors though. I'll ignore that for now. It's cool to see 3D drawing and turn it around. That's my target today. Familiarize with the footprint creation process as well. Searched for parts Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-31565326933871260362021-01-21T13:27:00.002+08:002021-01-21T13:27:35.274+08:00FreeCAD 3D modeler Decided to install KiCAD today. At the end of the installation, a text box popped up advising user to install FreeCAD in order to use 3D view in KiCAD. Interesting enough, I just installed the FreeCAD. It's new to me. Need 2GB space for FreeCAD itself. Start it up and being brought into first page with a few sample drawings. Pretty nice. I'll learn it up. Nicely developed free CAD Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-66116464207411544872021-01-21T00:07:00.004+08:002021-01-21T00:07:25.567+08:00Circuit Simulation in KiCad A beginner reference on how to run circuit simulation with KiCAD. https://www.woolseyworkshop.com/2019/07/01/performing-a-circuit-simulation-in-kicad/Just a quick note as a reminder for myself today. Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-54979834354820096712021-01-20T18:37:00.003+08:002021-01-20T18:37:24.134+08:00Google Meet? In COVID-19 era. No no... I should use the word era. It should be Crisis. Sorry. Most of the personal meetings have been converted from physical to cyber. That's online meeting / conference. I used Microsoft Teams for work. Heard of Zoom meeting used a lot by many personal calls. Still have many other online meeting tools to consider, such as Facebook video call, WhatsApp call, Telegram call, Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-89261798195937499212021-01-20T14:31:00.005+08:002021-01-20T14:31:42.865+08:00Photography for Money? I capture a lot of photographs. I mean when it's artistic or meaningful. Can I make money from it? Not sure. Watching TV and they talk about ShutterStock. hmm... interesting. Let's paste here and see if I can make some money out of nice photographs. Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-7987747654519395712021-01-20T12:25:00.003+08:002021-01-20T14:02:25.069+08:00Free Schematic Design Software In searching for a simple to use electronic simulation tool, I changed search term to Schematic Design Software. Found this website to list out a few interesting EDAs. https://www.electronics-lab.com/top-10-free-pcb-design-software-2019/Good listing. I knew Eagle schematics but it's no longer free since it's been acquired by Autodesk. Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-9883427184960214752021-01-20T11:44:00.003+08:002021-01-20T14:03:04.617+08:00Electronic Circuit SimulatorIt's been a while I haven't looked around for electronic circuit simulation software. Just random search and found this website to be quite informative. https://www.circuitstoday.com/circuit-design-and-simulation-softwaresIt listed a few open source circuit simulators. I'm not familiar with most of them, but heard of MultiSim and PSpice before. I'll have to read and go through the software Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-43100374450725393222015-08-03T20:38:00.003+08:002015-08-03T20:39:19.974+08:00Quote of the day - By Soichiro Honda
Quoted from Soichiro Honda:
"Success can be achieved only through repeated failure and introspection. In fact, success represents one percent of your work, which results only from the ninety-nine percent that is called failure."
Reference:
Driving Honda: Inside the World's Most Innovative Car Company [UK Edition]
Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0tag:blogger.com,1999:blog-8820078909345993726.post-62158759524646454012014-11-24T00:44:00.001+08:002014-11-24T00:46:13.754+08:00Left behind alone (MV) เหลือเป็นคนสุดท้าย
I'm similar to the story. Feeling lonely for so long.
Oliver Leehttp://www.blogger.com/profile/09729237697077392671noreply@blogger.com0