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# 555 Timer Operation

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11 Threads found on edaboard.com: 555 Timer Operation

## 0 to 60 (sixty) seconds monostable 555 timer

Hi ! i know how to design monostable multi vibrator using 555 ic , but cant know to make it using variable resistor and fixed capacitor value upto 60 seconds thanks

## 555 astable with LED at R1

I have a standard 555 astable mode circuit -- I'll refer to the circuit diagram in the Wikipedia article, It's powered by a 9V battery, and the output is going through a small resistor straight to a speaker. R2 is 10K C is 10nF Instead of R1 I have a choice of two resistors: one is 167K, which gives

Basically the whole operation of the 555 timer revolves around the three resistors that form a voltage divider across the power supply, each resistor ~5k (for the bipolar version of the IC) so the comparator reference voltages are 1/3 and 2/3 of the supply voltage. The pin 5 identified as ''Control Voltage Input'' can directly affect (...)

## pls help me .......want detailed working....???

At first take a look at the datasheet of 555 timer(and study different mode of operation of 555 timer IC) and decade counter CD4017 load driver transistor drives the motor based on the PWM generated by 555 timer IC...

Well I am not an expert but I think you can use 555 timer circuit in astable mode to generate the strobe for LED's. Microcontroller really required here? I am attaching some theory and pspice simulation results which can help you understand the 555 timer operation in astable mode. Even if your are not (...)

## duty cycle problem - change from 50 to 10-20%

One option is to feed this 50% square wave to 555-timer (monostable operation) and adjust R-and-C so the output wave has required 10-20% duty cycle .. Here is info on how to calculate T with 555-timer: Rgds, IanP

## New here - relay logic question (time delay)

You may want to describe the intended circuit operation more clearly. To my opinion it's hard to understand either from the circuits or your description. Generally, introducing a delay in the said range involves capacitors of about 1000 uF. It can be implemented more easily with active parts, either timer circuits with 555 or transistors (...)

## Problem with simulating stable oscillator using 555 timer in Circuit Maker 2000

Hi guys , I am trying to simulate the standard astable oscillator using 555 timer, in circuit maker. But i am not getting any oscillations at all. Could you guys please help me out. The circuit is the same that you find in most of the 555 timer books .(operation in astable mode) Regard Vasan SNS

## 50% duty cycle using 555 timer

Hi, I would like to draw your attention to the CMOS version of the 555 circuit, the LMC555 from National Semi. or TLC555 from Texas Inst. and the astable mode working frequency is claimed to be 2MHz typically at Vcc of 5V. Its data sheet includes a diagram for 50% duty cycle operation too. See this link that includes it: (...)

## 555 timer monostable operation

Just a question regarding triggering of a monostable 555 timer, what will happen if I pull down the trigger of the monostable circuit to the ground on the ouput? Say, I trigger it (put trigger pin to ground) and will just put it on ground (not release it), what will happen to the output? Will the monostable do its normal operation or it (...)

## Free 555 timer design program!

On 2001-09-17 08:54, Robin Hood wrote: This free 555 timer design program provides for four operation modes (3 astable, 1 monostable), plus 16 application examples, and timer/component specifications. File size: 253KB Thanks for sharing

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