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LED Flashers and Blinkers

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Plant Watering Watcher

Plant Watering Watcher

This circuit is intended to signal when a plant needs water. A LED flashes at a low rate when the ground in the flower-pot is too dry, turning off when the moisture level is increasing. Adjusting R2 will allow the user to adapt the sensitivity of the circuit for different grounds, pots and probe types.

http://www.redcircuits.com/Page18.htm

Two wire Lamp Flasher

Two wire Lamp Flasher

This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply.

http://www.redcircuits.com/Page26.htm

LED or Lamp Flasher

LED or Lamp Flasher

Flashing frequency can be varied by changing R1 value in the 1M to 4M7 range. This circuit is very efficient when driving a small 3.2V incandescent lamp. In this case omit the LED and R3, connecting the bulb across Q2 Collector and positive supply, further reducing parts counting.

http://www.redcircuits.com/Page14.htm

Dancing LEDs

Dancing LEDs

The basic circuit illuminates up to ten LEDs in sequence, following the rhythm of music or speech picked-up by a small microphone. The expanded version can drive up to ten strips, formed by up to five LEDs each, at 9V supply.

http://www.redcircuits.com/Page57.htm

Rotating LED Display

Rotating LED Display

Alan Parekh designed a rotating LED display where the board can be seen rotating very quickly and a word appearing in mid air.

http://alan-parekh.com/projects/rotating-led-display/

LED Torch

LED Torch

The LED Torch in Fig. 1 consumes just 24 mW, giving it more than80 times longer service from 4 AA alkaline batteries that is, up to one month continuous service. Although the torchs light output is modest, it is nonetheless quite sufficient to illuminate a pathway for walking.

http://www.zen22142.zen.co.uk/Circuits/Misc/torch.htm

LED Display for power supply 6V or 15V by LM3909

LED Display for power supply 6V or 15V by LM3909

This circuit uses the integrated circuit LM3909 perform be LED Flasher and Oscillator. For Drive LED give Flasher on off with Frequency 2Hz. For formed show of office equipment with Battery For battery 6V size Capacitors

http://www.elecfree.com/electronic/led-display-for-power-supply-6v-or-15v-by-lm3909/

Discrete LED Color Organ

Discrete LED Color Organ

Here is a new version of the classic color organ, where different color lights are triggered by different frequencies of sound, resulting in a display that flashes along to music. In this case the newer type high intensity LEDs-3000 - 5000mcd were used along with a very simple discrete transistor drive circuit.

http://www.radiolocman.com/shem/schematics.html?di=52283

LED or Lamp Pulser

LED or Lamp Pulser

This circuit operates a LED in pulsing mode, i.e. the LED goes from off state, lights up gradually, then dims gradually, etc.this gives an astonishing effect with 4.5V supply.

http://www.redcircuits.com/Page51.htm

LED Chaser

LED Chaser

This schematic is a version of a simple 10 LED chaser. There is no 555 timer used .Instead, an oscillator made up of two sections of a 4011 NAND gate is employed. This chip is very inexpensive and extremely common.

http://aaroncake.net/circuits/chaser.asp


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