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Precision LED Blinker – Circuit Schematic
Precision LED Blinker
The circuit allows a precision regulated drive current to be set to drive an LED, and in response to a TTL level signal, the LED is switched on and off with ris...
R/C Airplane LED Flasher – Circuit Schematic
R/C Airplane LED Flasher
This was designed to flash a pair of LEDs to be mounted on the wing tips of a Parkzone Citabria R/C (remote control) airplane. The unmodified Parkzone Citabria ...
LED Battery Checkers – Circuit Schematic
LED Battery Checkers
The "Battery Good" checker. When the button is pressed, the green LED will glow if the battery voltage is above the preset threshold. This version has a higher...
LED Power Failure Light – Circuit Schematic
LED Power Failure Light
The power failure light that I eventually designed and built is housed in the plastic case from a wall-mounted power transformer. I had accidentally destroyed t...
Fading LED blinker – Circuit Schematic
Fading LED blinker
The lower the voltage, the easier it would be to fit the batteries into the caboose along with the flasher circuit. The venerable LM3909 LED flasher came to mi...
One transistor LED Flasher – Circuit Schematic
One transistor LED Flasher
This may be the simplest LED flasher circuit you can build, with the notable exclusion of LED's with integrated flashing circuits. This might be a good replacem...
LED Matrix board circuit – Circuit Schematic
LED Matrix board circuit
This is a simple, programmable, autonomous and extensible LED matrix with the possibility of being controlled by a computer using a RS232 connection. Its basic ...
White LEDs Flashlight – Circuit Schematic
White LEDs Flashlight
Here is a schematic of a rechargeable 9-LED flashlight using two Gates SLA cells and nine LEDs. It is as bright as when the single bulb was used, and lasts 3 ti...
Dot matrix LED display – Circuit Schematic
Dot matrix LED display
The device comprises two parts: LED control board and LED display board. The two PCBs are designed to fit together one behind the other using two sets of dual r...
Fake Alarming LED Flasher – Circuit Schematic
Fake Alarming LED Flasher
The parts to the right of T1 form a simple Joule-thief ('Blocking' oscillator) circuit which boosts the 1.2v supply to 3.5v to operate the LED. C1 is used to ex...
LED Voltage indicator – Circuit Schematic
LED Voltage indicator
When the input voltage is 0 the LED glows. The LED stops glowing when the voltage rises to the level determined by R2. Reverse + and - pins to reverse operating...
LED Ultraviolet exposure box – Circuit Schematic
LED Ultraviolet exposure box
The LEDs are OSSV53E1A from OptoSupply and they have an 140° angle. This means that the first plane with uniform density can be obtained at a shorter distance ...
Mains Blinking LED – Circuit Schematic
Mains Blinking LED
I needed a pulsating light for a certain signaling. Voltage was 230V. So I decided to make a simple circuit, consisted of a LED diode, two capacitors, two resis...
Power Failure Light – Circuit Schematic
Power Failure Light
This is a very basic power failure lighting circuit based around a relay. This simple circuit has many uses, from lighting up rooms and walkways in the case of ...
Led Flasher with a BC547 NPN transistor – Circuit Schematic
Led Flasher with a BC547 NPN transistor
This is a novel flasher circuit using a single driver transistor that takes its flash-rate from a flashing LED. The flasher in the photo is 3mm. An ordinary LED...
200W Lamp Flasher with 555 timer – Circuit Schematic
200W Lamp Flasher with 555 timer
200W Lamp Flasher is used to flash lamps, bulbs and halogen lamp to give your product that attracting look....
LED Flash Driver with HT2050 – Circuit Schematic
LED Flash Driver with HT2050
This circuit is based around HT?2050 manufactured by HOLTEK semiconductors. It is a low cost, low-power C-MOS LSI designed for lamp andLED flash driver. It requ...
Mains supply fail Emergency Light – Circuit Schematic
Mains supply fail Emergency Light
The circuit comprises two sections: charger power supply and LED driver.The charger power supply section is built around 3-terminal adjustable regulator (IC1) ...
Simple power Supply for LEDS – Circuit Schematic
Simple power Supply for LEDS
LED's are great display tools. Their prices have decreased to a point where they are replacing more conventional light sources. In one sense their characteristi...
6 Channel Disco Running Lights – Circuit Schematic
6 Channel Disco Running Lights
From 230 V AC a DC supply of + 5 V is obtained. The power supply is given to the other blocks. The pulse generator at a particular frequency generates the cloc...