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مدار چشمک زن زیبا با هشت عدد LED

کاربرد در سون سگمنت


‘Random’ Flasher for 8 LEDs Project

This project flashes eight LEDs in an apparently random manner. It uses a 4026 combined counter and display driver IC which is designed for driving 7-segment LED displays. The sequence is not really random because seven of the LEDs would normally be the display segments, the eighth LED is driven by an output that is normally used for driving further counters. The table below shows the sequence for the LEDs. You can use less than eight LEDs if you wish and the table may help you decide which ones to use for your purpose.

This project uses a 555 astable circuit to provide the clock pulses for the 4026 counter. Resistors are not required for the LEDs because the 4026 IC limits the current to about 5mA for each LED.

Parts Required

Table showing 4026 outputsresistors: 10k, 47k
capacitor: 1µF 16V radial
۳mm or 5mm LEDs ×۸,
they can be various colours
۵۵۵ timer IC
۴۰۲۶ counter and display driver IC
DIL sockets for ICs: 8-pin, 16-pin
battery clip for 9V PP3
stripboard: 16 rows × ۱۴ holes

نوشته‌شده در

مدار چشمک زن زیبا با هیجده عدد LED

مدار چشمک زن زیبا با هیجده عدد LED
هیجده عدد LED بصورت اتفاقی چشمک می زنند

متن ترجمه نشده (ببخشید ولی اگر سوالی بود بفرمایید)


Christmas Decoration Project

Christmas Tree DecorationThis project flashes 18 LEDs at three different rates and you can use these to create a Christmas decoration of your choice. The circuit is kept simple (and cheap!) by using the 4060B IC which is a counter and oscillator (clock) in one package. The circuit requires a 9V supply, such as a PP3 battery. It will not work with lower voltages and a higher voltage will destroy the LEDs.

The preset variable resistor can be used to adjust the oscillator frequency and this determines the flash rate of the LEDs. The IC limits the current to and from its outputs so the LEDs can be safely connected without resistors in series to limit the current. The stripboard part of the circuit is easy to build but the wiring for the LEDs needs care so detailed instructions are provided below.

Warning!
Using a battery (or power supply) with a voltage higher than 9V will destroy the LEDs.
You can see from the circuit diagram (below) that 6 LEDs are connected in series between the +9V supply and 0V. Each LED requires about 2V across it to light, so using a voltage of about 12V (= 6 × ۲V) or more will make the LEDs conduct directly, regardless of the 4060B IC. With no series resistor to limit the current this will destroy the LEDs.
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Parts Required

resistors: 10k, 470k
preset: 47k (this could be 100k if necessary)
capacitor: 0.1µF
۴۰۶۰B IC
۱۶-pin DIL socket for IC
LEDs × ۱۸, ۵mm diameter, any mix of colours: red, orange, amber, yellow or green
on/off switch
battery clip for 9V PP3
stripboard 13 rows × ۱۸ holes