Tested Circuits and Projects (250)

These circuits were tested and worked properly!
Browse through a total of 250 tested and working circuits and projects! Now you can build these projects with trust knowing the fact that all are working properly.

Electronic Products Review Roundup

Rich Quinnell - 10/11/17

  If you like the work that T.K. Hareendran has been doing here, you should check out his [...]

Open-Source Light Meter

T.K. Hareendran - 09/20/17

Light meters, these days, are no longer a mystery: From home-improvement stores to eBay and Amazon you can [...]
arduino with keypad

Arduino with Keypad Tutorial

T.K. Hareendran - 11/25/15

A keypad is one of the most commonly used input devices in microprocessor applications. In a standard keypad [...]
Input Offset Voltage Test Schematic

Test Op Amps Via Simple Input Offset Voltage Measurement

Jim Keith - 10/04/15

Measuring this one vital parameter (Input Offset Voltage) provides a simple means of determining if the DUT (Device [...]
Static Reversing 3 Phase SSS Schematic

Static Reversing the 3 Phase Induction Motor

Jim Keith - 09/27/15

This solid-state thyristor (SCR) switch circuit is perhaps the simplest means of reversing a 3 phase motor. “Static” [...]
impulse detector circuit diagram

Improved Impulse Detector with CD4029N

T.K. Hareendran - 08/28/15

An impulse detector circuit observes input pulses from an external sensor/source and converts into a processable output signal. [...]
addressable leds

Arduino Addressable LEDs & Splendid Projects

T.K. Hareendran - 08/22/15

Today, we're going to explore the uses of addressable LEDs. Addressable LED is an easy way to add [...]
SW-520D arduino tilt sensor wiring

Arduino Tilt Sensor Experiment

T.K. Hareendran - 08/07/15

Tilt sensors are essential components in security alarm systems today. Standalone tilt sensors sense tilt angle or movement. [...]
Pocket LED Microscope

Enhance Your Pocket LED Microscope

T.K. Hareendran - 08/05/15

This eBay item, sold under different names, is a very useful accessory for electronics hobbyists. The gizmo is [...]
arduino rain sensor

Arduino & Rain Sensor Experiment

T.K. Hareendran - 08/03/15

The experiment is for switching an acoustic sounder as a rain alarm after a predetermine time. It may, [...]
Motorcycle Battery Level Indicator

Motorcycle Battery Level Indicator

Jim Keith - 03/24/15

This battery level indicator offers (2) incandescent lamps that light up progressively as the voltage increases. It is [...]
Linear DC Signal Opto Isolator Schematic

Linear DC Signal Opto Isolator

Jim Keith - 03/21/15

This simple circuit provides better than 1% accuracy in optically coupling a DC voltage signal. To compensate for [...]
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