Poor man’s Luxury Car Dome Light
If you often drive early in the morning or at night, you spend most of your time in a dark vehicle, and at that time a small interior/dome/cabin light becomes an indispensable widget if you […]
Dual PC817 Optocoupler Module – Buy or Do It Yourself?
A while back, I came across a set of multichannel optocoupler modules at a discount sale, and what immediately caught my attention was the PC817 dual-channel optocoupler module in that collection. So, this post is […]
Dual MOSFET Switch Module – WORTH IT OR NOT?
What is the point in critiquing a cheap Chinese power MOSFET module, you might ask. But I have a reason for that, because learning something useful from other people’s mistakes (even if they are trivial) […]
Learn To Play with Ceramic Resonators
As Wikipedia says, a ceramic resonator is an electronic component consisting of a piece of a piezoelectric ceramic material with two or three metal electrodes attached. Like the similar quartz crystal, when connected in an […]
True RMS & RMS – A Quick Refresher
This little post is a quick rescript of RMS and TRMS. As you know, this is not a popular or frequently discussed topic. So, let us jump in! RMS and TRMS RMS stands for Root […]
Automatic Aroma Diffuser (v2)
Last week the prime goal was to revise my design thoughts on automatic aroma diffuser and make a bit amended version for a distant client, again using a bunch of readily available inexpensive components. I […]
Universal RADAR Motion Detector
There are a lot of different parts in the electronics world, and often parts with the same functionality come indifferent forms and sizes. Now it is the time to pick another cheapo microwave motion sensor […]
NCV Tester Secrets
A non-contact voltage tester (NCV Tester) makes electrical work easier and safer – and for a few bucks you can own it from your nearest home improvement center. The NCV tester is a simplest and […]
Cable Float Level Sensor/Switch – First Look!
Float switch a type of level sensor that float on the surface of a liquid. It basically consists of a hollow float body containing a sensor or switch. As the liquid level rises/falls, the float […]
mmWave RADAR Sensor Primer
I have been using several microwave motion sensor doppler radar modules for years, but in cases where an ultrafine movement detection is demanded, those cheapo modules did not perform well. So I decided to have […]