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Led light based music circuit with LM3914 – Circuit Schematic
Led light based music circuit with LM3914
This is a simple light running circuit by music This circuit is not difficult, is MONO, with a few accessories. Can be connected to the output of a CD or....
LED dimmer circuit – Circuit Schematic
LED dimmer circuit
Typical segment displays LEDs consume around 25 mA for each segment and should be limited to it with resistors. If a six digit display is to be current limited,...
LED Light Pen – Circuit Schematic
LED Light Pen
Physicians and repair engineers often use small light pens for visual examination Spurposes. Rugged and expensive as these pens may be, their weak point is the ...
LED Flasher Circuit Using Transistors – Circuit Schematic
LED Flasher Circuit Using Transistors
This LED flasher circuit is a classic two transistor flip flop. This flasher circuit is very popular and it`s usually the first circuit to build when starting e...
LED Flasher 2-Transistors circuit diagram – Circuit Schematic
LED Flasher 2-Transistors circuit diagram
This circuit will flash a bright or high-brightness red LED (5000 mcd). Great for fake car alarm or other awareness getting equipment. Component values aren`t s...
LED Color Fade Effect circuit diagram – Circuit Schematic
LED Color Fade Effect circuit diagram
This is the circuit of LED color fade effect. Just like the name of the circuit, the light intensity of LEDs in this circuit will fade from high intensity to lo...
LED Bike Light Circuit Project – Circuit Schematic
LED Bike Light Circuit Project
On my mountain bike I always used to have one of those well-known flashing LED lights from the high street shop. These often gave me trouble with flat batteries...
LED Audio Level (VU) Indicator and Alarm: The Dot Turns to Bar When The Signal Reach The Maximum Le – Circuit Schematic
LED Audio Level (VU) Indicator and Alarm: The Dot Turns to Bar When The Signal Reach The Maximum Le
This LED (Light Emitiing Diode) display consist of 10 LEDs to indicate the level of an input signal. If the signal is small, only LED#1 will light, and if the s...
Sunrise Lamp – Circuit Schematic
Sunrise Lamp
In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A...
LED VU Meter – Circuit Schematic
LED VU Meter
The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at inc...
LED Tester – Circuit Schematic
LED Tester
You have to admit that these tiny electronic lamps are handy, and they last almost forever. Around 40 years after Nick Holanyak developed the first LED, they ha...
Knightrider lights for model cars – Circuit Schematic
Knightrider lights for model cars
This simple circuit drives 6 LEDs in `Knightrider scanner mode`. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version)...
IC Controlled Emergency Light With Charger Circuit – Circuit Schematic
IC Controlled Emergency Light With Charger Circuit
Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC co...
Flashing Eyes – Circuit Schematic
Flashing Eyes
This circuit was purposely designed as a funny Halloween gadget. It should be placed to the rear of a badge or pin bearing a typical Halloween character image, ...
AC Line powered LEDs – Circuit Schematic
AC Line powered LEDs
The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor to limit the inrush c...
72 LED Clock – Circuit Schematic
72 LED Clock
In the circuit, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same ...
120 VAC Lamp Dimmer – Circuit Schematic
120 VAC Lamp Dimmer
The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four diodes pr...
High Volt LED Flasher – Circuit Schematic
High Volt LED Flasher
Here is a Flasher circuit that directly derives power from AC to give brilliant flashes at the rate of one flash per second. It uses a Diac as the main ele....
Handy Pen Torch circuit – Circuit Schematic
Handy Pen Torch circuit
This easy to construct Handy pen torch  electronic circuit and low component count, uses two power white LEDs for lighting. Low volt (4. 8V dc) supply availab...
Flashing Heart circuit diagram – Circuit Schematic
Flashing Heart circuit diagram
Once power has been applied to the circuit, the Red LEDs should all be flashing on and off together. The Yellow LEDs should be flashing on and off, but only eve...