simple led tester circuit schematic

Simple LED Tester

Jim Keith - 02/04/2013

Do not let its extreme simplicity deceive you — this thing is useful! I have made many over [...]
universal wide voltage range led

Wide Voltage Range LED

P. Marian - 01/15/2013

LEDs are well-known for their current consumption, and sometimes a resistor is necessary to limit the current at [...]
LED DC Voltage Indicator

LED DC Voltage Indicator

Jim Keith - 10/25/2012

This LED DC voltage indicator circuit is a voltmeter, rather than simply a battery tester. As such it [...]
firefly lights circuit schematic

Firefly Lights Circuit

Jim Keith - 08/11/2012

This firefly lights flasher is an easy, fun project. It can be built on the tiny circuit board, [...]
pathway lighting circuit schematic

Pathway Lighting with LEDs

Sebastian Kushero - 08/03/2012

Simple pathway lighting that would provide illumination for the path at night. Extension for the Solar garden Light. [...]
220v blinking led circuit schematic

220V Blinking LED Circuit

P. Marian - 07/24/2012

This is a simple blinking led circuit powered from 220V that can be used to mark special places [...]
automatic solar garden light circuit schematic

Automatic Solar Garden Lights with LEDs

Sebastian Kushero - 07/23/2012

Efficient automatic solar garder lights circuit with minimum components the best deal is that is completely auto and [...]
single cell led flashlight

Single 1.2V NiMH Cell LEDs Flashlight

P. Marian - 07/11/2012

The single cell led flashlight circuit is a self-oscillating boost converter. A typical white LED has its best [...]
LED as a Polarity indicator

Simple and Useful LED Circuits

Srihari Rao - 07/07/2012

Due to the advantages like low voltages, long life, cheap, reliable, fast on-off switching etc, the LED's are [...]
inside the led

LED as Light Detector

P. Marian - 07/09/2011

Did you know that the LED can be used as a light detector? In fact green LEDs are [...]

Handy Pen Torch Circuit

T.K. Hareendran - 02/20/2011

This easy to construct "Handy pen torch" electronic circuit and low component count, uses two power white LEDs [...]
door keys finder circuit

Keyhole or Door Keys Flashing Finder

D Mohankumar - 01/26/2011

This 3 volt Lithium cell operated LED flasher can be used as a keyhole finder in darkness or [...]
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