Homebrew Perpetual LED Nightlight circuit

LED flasher with two transistors circuit

This circuit will flash a bright LED 5000mcd as an intention getting device or fake car alarm. More: Component values are not critical and different transistors may be used. This circuit functions as a visual alert system by utilizing a high-brightness...

temporary led lampilluminator circuit

Here is a design for a temporary lamp circuit that is very helpful in emergency situations or in any application where there is limited time to turn off the lamp. Simply press the push button to perform a quick task,...

220V Flashing LED Circuit

An AC mains operated single LED flasher circuit is constructed using the widely utilized CMOS timer chip TLC555. The entire circuit is powered directly from the 230VAC grid supply via a capacitive potential divider and associated components. This compact LED...

Led Millivoltmeter

This circuit utilizes a DC amplifier (LM324) in a bar-graph configuration that employs an LM339 quad comparator integrated circuit (IC) to detect DC levels. The LEDs illuminate for every 100 mV increase. The LM324 operational amplifier is set up to...

simple led automatic daynight lamp

The power supply utilized in this circuit is of the capacitive type, eliminating the need for a transformer and allowing for a compact design that can be easily installed in small spaces. The circuit employs LEDs instead of traditional filament...

LED Boost converter Joule Thief circuit

Previously, a boost circuit was tested that enables the powering of a 3 V LED using a discharged battery (approximately 1 V or lower). This circuit consists of a single transistor, one resistor, and a small transformer with a 1:1...

Thrifty LED Protector

An LED will fail if the current flowing through it is excessively high. This issue can be easily resolved by incorporating a simple resistor in series, which is an effective and low-cost solution. However, as the power supply voltage increases,...

Tabletop Tree Lights

A garland tree was enhanced by adding blinking LEDs. The tree is a simple garland wrapped around a plastic frame, purchased at a discount. Although it could have been made from scratch, the cost-effectiveness of the purchase was appealing. The...

Multicolor HD LED

Most PC enclosures provide only a single LED to indicate hard disk access, which is connected to the motherboard via a two-pin connector. However, this LED only functions with IDE drives, and if a SCSI disk controller is installed, its...