How Crank Flashlights Work

A crank flashlight basically works by hand cranking a permanent magnet motor, which generates electricity for illuminating the attached LEDs. Motor Becomes a Generator Normally, a permanent magnet motor is used for executing a rotational movement by applying a DC potential across its specified supply terminals. However we also know that the same motor can … Read moreHow Crank Flashlights Work

BLDC Ceiling Fan Circuit for Power Saving

Within the next few years we may find all conventional capacitor-start type of ceiling fans getting replaced with BLDC ceiling fan circuits, since the concept allows the operation to be extremely efficient and save power by more than 50%.   Replacing Capacitor Start Fan with BLDC Fan Just as the traditional incandescent lamps today are … Read moreBLDC Ceiling Fan Circuit for Power Saving

Mains 220V Electronic Touch Switch Circuit

You can convert your existing mains 220V light switch circuit with the electronic touch switch circuit explained in this post. The circuit is built around the chip M668 and it employs just a handful of other components for implementing the proposed  mains touch switch ON/OFF application. By Ritu Panday How this simple mains electronic touch … Read moreMains 220V Electronic Touch Switch Circuit

PIR Triggered Message Player Circuit

In this post we diagnose a PIR activated message player circuit, which was sent by Mr. Norman Kelley one of the dedicated followers of this blog for improvements. Let’s learn more about the design through the following discussions. Triggering Message Playback with a PIR Input I have been working on a project for about a … Read morePIR Triggered Message Player Circuit

Touch Activated Lamp Circuit with Delay Timer

The proposed transformerless touch activated 220V delay lamp switch circuit enables the user to momentarily switch ON a table lamp or any other desired bed lamp during night time. By Tina Kamat How the circuit Works. Referring to the circuit above, the four diodes at the input form the basic bridge rectifier circuit for rectifying … Read moreTouch Activated Lamp Circuit with Delay Timer

Surge Arrestor Circuit with Measuring Facility

In this post we learn about a simple surge voltage protector circuit using a fuse and a triac crowbar circuit and also learn the method to record and measure the last maximum surge that could have destroyed the specified load in case the protection was not introduced. The idea was requested by Mr. Akram. Circuit … Read moreSurge Arrestor Circuit with Measuring Facility