Musical Doorbell
How to build a cheap and cheerful musical doorbell using a few electronics parts laying around? I recently planned to try one idea, and this week I had the time for that. Now, I would […]
Fishing Light Attractor – DIY
Using light is a common way to trap fish in fishery industry. Attracting fish by using artificial light source is to induce them to form a large shoal at night taking advantage of fish’s photo […]
PWM Heatsink/Chip Cooling Fan
Interest has been growing in design ideas for controlling the speed of heatsink cooling fans in electronic equipments. This article will describe how to simply design and build a governable heatsink/chip cooling fan for your […]
Magic Cup Light Module – Quick Tries
What is a Magic Cup Light Module you may be asking yourself? Well it’s an inexpensive Chinese module comprises a small mercury tilt switch and a light emitting diode. In this article, I’m going to […]
A Junk box 555 PWM Generator
Often you’ll need a simple pulse width modulation generator circuit to test or run small dc lamps and motors in your electronics projects. There’re ways of creating cheap and practical circuits at home, and today […]
An Isolated 1 Key Touch Pad Project
With this article, I’m trying to share one simple idea on how to build a single-key touch pad sensor/switch using a quick and cheap Chinese module. We can easily build a simple touch sensor using […]
Build Your Quick & Dirty Foam Cutter
Let’s make a quick and dirty foam cutter! Foam is an easy and cheap material for various prototype creations, and cutting the common polystyrene/Styrofoam is easy with a hot wire cutter. Now do it yourself […]
An Easy 555 EC Sensor!
Aware that a particular circuit is needed to measure electrical conductivity (EC) of a liquid. Since the conduction of current through a water solution is mainly dependent on the concentration of dissolved ionic substances such […]
An Isolated Power MOSFET Switch
I volunteered to design a simple and inexpensive isolated power mosfet switch to control some electric loads by a ‘pulsed’ low-voltage input signal. There are of course superb solid state relays (SSRs) that we could […]
The Mysterious Laser Receiver Sensor Module!
This article introduces a laser receiver sensor module available on the web. The module, named “Laser Receiver Module Non-modulator Tube Laser Sensor Module”, comes as a cheap module usually without a user guide. So it […]