Led Running Display | Electronic Project Circuits

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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 cassette player Time.
Operation of the circuit. Begins to be input via VR. The VR will function fine, signal strength coming. D1 will take disconnected hemisphere plus leaving only the signal hemisphere removed to activation of Q1. Signal is extended through Q1 to pin 5 input of IC1. By C1 forward delay of the IC is not the LED (connected to the output. of IC1) off immediately. The IC IC1 is finished. The act shows the effect of the voltage at IC1 pin 5 of the display by the LED to pins 1-19 of the IC, which is within range. compared to a multiple voltage standard circuits. The circuit can operate effectively. In the R1 that it will determine the current flowing through the LED. To prevent LED damage.
Use should be connected to the input of the circuit. To the speaker terminals, change the value of R3 is 10k and IC1 can choose to display two types Bar (Bar) when the pin 9 and a power source. Dots (Dot) on 9-pin to float to drop.

1 comment - What do you think? Posted by admin - November 25, 2010 at 7:41 am

Categories: LED Flasher, Meter Tags: led running display, light music, LM3914

7 Led light running adjust speed by 4017 and 555

The led light running circuit generally can not adjust the speed of running. Cause dull monotony. Resulting in an idea to build this circuit up. This circuit can adjust the speed of the led light as needed. Makes this circuit can be used more versatile.
Operation of the circuit is divided into two parts: frequency generators. And the display. By the frequency generator IC1 contains a number Ic timer circuit 555 and frequency generator. Defined by the R1, VR1 and C1 will be the output signal at pin 3 of IC1 sent to display section.
In display section consists of IC2, a number CD4017 IC Counter circuit is displayed by the volt at pin 3, 2, 4, 7, 10, 1 and 5, respectively, each pin. The speed depends on the frequency count obtained from pin 14 of IC2, which we can adjust VR1 adjusts the frequency from the frequency generator part.

Be the first to comment - What do you think? Posted by admin - August 16, 2010 at 10:16 am

Categories: LED Flasher, Lighting Tags: led flashlights, led running display

Running Lights by LM555 + 4017

The 555 Astable generates a clock for this circuit, an oscillator giving a square wave output at pin 3 which is counted by 4017 to give a running lights effect.
The decade counter-divider CD4017 has 10 outputs, for every low to high transition at the clock input, rising edge, the counter advances one LED. After going one full circle the the first LED lights again and it goes on. You can vary the value of R2 100K Linear potentiometer to make LEDs run fast or slow. The frequency of oscillation of astable 555 is given as f = 1.44 / ((R4 + 2 * (R2 + R3)) * C3)
The 10 outputs have 10 green LEDs. The current thru the LED is limited by R1, the current can be calculated like this (9V – 1.6V) / 1K = 7.4mA this is within 20mA which is the danger limit of the CMOS output. You want it to be bright use transistors for every output.

Buy light running circuit

The cap C1 is a filter and C2 is to prevent noise at pin 5 influencing the output as it is a control voltage point.
You can cascade or chain many more counters with the CO or carry out pin 12 of 4017. The pin 15 reset is kept at low for counting, on high it will reset the counter but is not used in this circuit.

Source:http://www.electronics-circuits.com/schematics/catDigital_Circuits.html