Dot Bar Display | Electronic Project Circuits

Posts Tagged ‘dot bar Display’

Led light bar scan back and forth led two color

This circuit is a circuit run on alternating two colors.It uses the 2-color LED with a built-in 3-pin single.This will chase away the glow of each LED until the end.It turns alternating to another color.In any way to the moon on the moon first end, then the LED end of the first LED.Circuit consists of, nand gate ic.Two 10 Counter circuits IC, and IC JK flip flop.
Operation of the circuit is divided into 3 sets.It is a set of signal generators, a set of display and control.Set the signal generator is IC1a,and IC1b number 4011 is a signal generator.The R2, R3, C2 determine the frequency generated.The signal is fed to a set of impressions is the number 4011 IC2 and IC3.The 10 counter circuits to output to the LED, and Is the same, but the work must be performed one at side. Therefore, the signal from pin 11 of IC 2 and tested for D2 and D3,To pin 3 of IC4.The integrated circuit IC 4 is a JK flip flop is connected to a T flip flop.The signal input pin 3 and pin 1 is the output signal.Which sends a signal to the Reset IC either stop working.IC4 on the anniversary, it will output the first time, in contrast to pin1.IC3 make work, IC2 stopped.
IC2 is controlled by signals from pin 1 of IC4, to IC1c.Prior to control IC2.The IC3 is connected to pins 1 through D1 to the control again.

Be the first to comment - What do you think? Posted by admin - March 2, 2011 at 11:07 pm

Categories: LED Flasher, Lighting Tags: dot bar Display, led light running

Bargraph Voltage Indicator by LM339

The circuit Bargraph Voltage Indicator used IC op-amp two quad voltage comparators to illuminate a series of 4 LEDs indicating volume level.
The op-amp used in this particular circuit is the LM339. It is a popular IC and should be available from many parts stores.
The 1K resistors in the circuit are essential so that the LED’s turn on at different Voltage input levels.
The sensitivity can be decreased with R1 and the input control to read higher levels.
This circuit is easily expandable with more op-amps, and is not limited to use with the LM339.
Detail more,Plaese read in image.

Be the first to comment - What do you think? Posted by admin - May 19, 2008 at 5:09 pm

Categories: LED Flasher, Meter Tags: dot bar Display, led voltage indicator, LM339

LM3914 – Dot/Bar Display Driver

Features
Drives LEDs, LCDs or vacuum fluorescents
Bar or dot display mode externally selectable by user
Expandable to displays of 100 steps
Internal voltage reference from 1.2V to 12V
Operates with single supply of less than 3V
Inputs operate down to ground
Output current programmable from 2 mA to 30 mA
No multiplex switching or interaction between outputs
Input withstands ï¿½35V without damage or false outputs
LED driver outputs are current regulated, open-collectors
Outputs can interface with TTL or CMOS logic
The internal 10-step divider is floating and can be referenced to a wide range of voltages
General Description

The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display