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37 Threads found on 555 And Timer And Design
First of all, hi everyone! I'm new in this community and this is going to be my first design as an Electrical Engineer. I'm getting perfect 12VAC signal with 1khz from this circuit. But when I try regulating this 12VAC to 6VDC 1Amps, I'm having huge voltage drops and regulator doesnt work. I think (...)
What I meant was laser security alarm, I saw some circuit that used ic 555 for timer and some circuit used ic 4071 for reset. What I want to ask is, is it possible to combine two ic (555 and 4017) in a circuit to have the laser security alarm a timer (...)
try astable mode calculator: R1=27k R2=1k5 C=1000uF
It's about factor 1000 beyond datasheet specified time intervals, so the you can't rely on the datasheet to determine if it's possible and how. It might work, possibly needing some protection means to isolate the large capacitor. But it's easier to refer to a timer that supports longer delays by design, e.g. a CMOS (...)
Hello, I am trying to build a simple form of single bit ROM (core rope memory) for illustration purposes.Before proceeding with the design, I am making some tests on a transformer. The picture shows a pulse comming out of a 555 timer, into one turn on the primary. The secondary is connected to an oscilloscope. Every time a pulse (...)
Instead of trying to design a HV transformer with a ferrite of unknown parameters, I would recommend to try a flybackblock from an old TV set operated on 12 VDC. A typical HV is 10-15 kv without load, and the switching transistor can be driven from a 555 timer with ~15 kHz. The HV blocks are also safe to (...)
Hey Guys My name is Dante , and i want to design and create a pc gamepad "GUN" that includes a motiontracker and a solenoid. An example of a motion tracking gun is : Half-Life 2 VR head and gun tracking mod for the Oculus Rift The motion (...)
There is really no need to incorporate a 555 timer into the design. Most microcontrollers, including PICs, can easily generate a pulse train or PWM and most tachometer designs do not require such signal to be an effective design. Typically tachometer (...)
This design allows you to vary the output level (using R5) and allows you to switch between square wave or sine output. You can easily design the 30kHz clock source with a 555 timer.
check this post and it will help you alot
im using Agilent ADS 2009. how to create a 555 timer? please help. im a newbie in this software.
these two componets are also used to design filters. capacitors are also used for dc battery stability (to eliminatea/c flutuations). caps are used for timing (by charging and discharging through resistors) in 555 timer circuits. etc
This is my voltage stabalizer that I found in one of those old analogue electronics book. Need it for my project and had built it but it didn't work 68931 I also need to use a h-bridge to convert my DC battery to AC sinewave. The circuit used is shown below 68932 I cant seem to get both of em' workin
How can I use a 555 timer IC and LM 386 in ADS? is there built in ICs or do I have to design them my self? and where can I get the schematics of the ICs?
hii, I have to design a flyback smps of o/p power 3W. I want to use 555 timer as PWM oscillator and control the duty cycle from 0 to 50% using control voltage. 1. In what configuration 555 timer will be configured, whether astable or monostable mode 2. How can i (...)
Google "555 astable multivibrator" and look at a few of the websites you get back. There are MANY that talk about how the circuit works... all the way down to the nitty-gritty details about the level comparisons and current mirrors inside the 555 IC.
Use a simple 555 circuit- ASTABLE OSCILLATOR CALCULATOR R1=120k, R2=68k and C=220uF Theoretically results t1=29s/t=10s :grin: LM555 timer Circuits
Hi, Any solid reason is there for choosing 4060 IC as an 3second monostable circuit. The same can be easily achived with 555 timer.
This page has the equations and a calculator 555 Calculator Also check 555 and 556 timer Circuits Alex
Yes, you just need a timer (e.g. 555) and a counter/logic circuit, that generates the pulse sequence for the stepper.
I heard about this competition through a newsletter for more information visit the contest website 555 Contest: Welcome! . Cool competition and prizes are cooler !!:lol: Abeer :twisted:
Hi, 1) as for interfacing the 8051 using RS232 check any 8051 related book(mazadi could be a good one)/ or just google it out. 2) For controlling the realys why do u need NE555 ? Whats the purpose you are trying to achive? I guess you are getting the basics wrong!!!! Asimov
It can be done in several ways, here is one example: -Connect a diode between the reader and 12V-door .. -design a timer (can be based on 555) which will be trigged by the falling edge of the 12V-signal from the reader .. -Connect the output from timer (if you need more current you can (...)
It doesn’t make any difference which pole you label with (0)V .. That is the matter of convenience and/or convention .. For as long as the 555 “sees” the right polarity your circuit should work just fine .. Rgds, IanP
I am trying to build an LED chaser using 4017 decade counters and a 555 timer chip. My design is based on that from this website, with a few changes: Instead of using 9 LED's, I wanted to use 12, which required a third 4017. I basically daisy chained it into the loop, so that now IC
Friends, I originally posted this question in Analog design section, but I think it might be more appropriate to post here. I'm using protel to do some simulations and in my circuit there is a ICM7555 cmos 555 timer. I downloaded a couple of spice model files for this module (most of (...)
u can use 555 timer IC for this purpose
I search around NET and found that IC555 can work as Asymmetric timer. I would like to control 220v FAN power on 60 mins. then Off 30 mins. and so on in periodic until I unplug them. I think the last circuit (the one that have diode) is best suit for me. Tm = 0.7 × R1 × C1 Ts = (...)
dear all, i want to design a timer having ON period=30 seconds to 1.5 minutes variable......and OFF period also variable from 2 minutes to 5 minutes........ I hope one can do using 555, but how to do ...plz advise me.... u tell me for 45 seconds ON and 4 minutes (...)
Hi, I was working with a servo controller recently. My initial design was using two 555 timer. One is an astable which generate 20ms period and a monostable which i use a potentiometer to control the pulse duration. I was able to control the speed and the position of the (...)
You can use a 555 timer configured as a one-shot. See its datashet for examples and calculations. You do not need to use the trigger input in your case.
Im using the AM Transmitter and Receiver Pair along with the RF600 enoder and decoder. I have constructed my PCB, the output is going to a 555 timer with a basic pair of LEDs and a buzzer. At the moment when I press the learn switch the status LED on the (...)
If you just want a square wave output, use a 555 timer or an op-amp/CMOS relaxation oscillator (plenty of examples in text books and on-line).
Couldn't open the schematic. Anyway the design have been used before and also there is a version that use a 555 timer and diferent RC constants for each key. Micro use a timer for frequency measuring instead of ADC port. But there is a problem in both (...)
Your diagram looks fine, but I have a question: Why don't you use 3 x 555 (adjustable time from 1 to ..10s) and connect them in a sequence ie. one triggs the next one, the last one triggs the first one... ? On power on you will need to trigg the first one and the whole sequence will run ..
use a voltage pump made form a pair of transistors and a 555 timer as the oscillator using a split secondary L44 coil the primary driven with a 555 output via bootstraping driving the non tapped side of this lt {low tension coil} this way youll get the needed 180 degree shift easy from just a (...)
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