Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [ne555]

143 questions
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Is the NE555 the IC I need, and if not, what do I replace it with?

I've noticed that whilst I have a well-known solution using an NE555, that IC doesn't fulfill my needs perfectly. Others have told me that the NE555 is very rarely an appropriate solution to one of the problems it's being used for. What are the…
Marcus Müller
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NE555 Based Speed Controller circuit - Contradicting Pins in 2 Tutorials

I am a newbie of Electronics and learning it as a hobby. Over a course of time I realized that Electronic Blogs are not the best place to learn Electronics, unless you have a strong basics and can correct silly mistakes in circuit diagrams posted…
sribasu
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What to make with hundreds of 555 chips

This is a little bit different question than normal.. Aliexpress is ruing my life, sometimes i order things i don't even need because it seems cool. A few time ago I ordered 500x 555 chips for just a few bucks, haven't used one. What cool project…
Luis Carlos
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555 timer frequency is way off

I'm currently designing a 555 timer to provide a 38kHz square wave to drive an IR LED as part of a beam interrupt detection system. This beam interrupt is a part of an embedded product where we cannot easily modify the existing processor software,…
Chris Fernandez
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What space applications use the 555 timer?

The 555 timer is considered the most famous integrated circuit of all time and is also credited with a versatile use in space travel. Hans R. Camenzind (the designer of the 555 timer) said that this IC is used for spacecrafts. However, I can't find…
Amor
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Light bulb lights up in a fraction of time (blinks) using TRIAC-BT136 and MOC3021 (Solved)

I have several days with problems when assembling the circuit of the image (it is a light bulb that turns on when you clap). To briefly describe the operation of the circuit, when the potentiometer is completely to the left, the led and the bulb…
aticboy
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555 startup timing issue

I'm new here, as I'm slowly drifting from mechanics and programming into more electronics stuff. The question I have, is if anyone could possibly point me in the right direction, as all of my searches have failed me so far (I might need more coffee,…
HappyOldtimer
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How does the led fade circuit with the NE555 timer work?

I searched about this and each explanation did not make any sense,my explanation is that when the OUT pin is HIGH the transistor turns on and the capacitor charges,also the led turns on gradually because the capacitor voltage rises,but when the OUT…
ROBOTICS
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Why can this ignition coil driver circuit not produce high voltage but only ~ 300 V?

Why is this ignition coil driver circuit not working correctly? (The coil is of this type, but used the model shown in the photo below.) The coil is driven with 16 V @ 5 A @ 540 Hz but I cannot get high voltage between the top connector and the…
Seolh
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Why won't this 555 timer flashing circuit work?

The circuit which I made shows the following behavior, when power is given to the circuit: Sometimes it lights up, sometimes it doesn't. When it does light up, it flashes properly for a few seconds but then becomes dimmer and dimmer. What is…
user29463
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555 Astable Timer produces incorrect period/frequency

I am building a 555 astable timer circuit for a course which must match the BPM of a song. The song has a BPM of 104, which requires a timer frequency of roughly 1.733 Hz. The circuit looks as follows: (the green wires go off to the left onto…
battr
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independent control of frequency and duty cycle in 555 timer (formulas)

I want to control frequency and duty cycle of output pulse of 555 timer. I searched and find this schematic in a post in SOV but I don't know how calculate frequency and duty cycle in the circuit. simulate this circuit – Schematic created using…
Mr. Nobody
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Output frequency unstable in 555 oscillator

I'm trying to make a simple astable NE555. The output frequency increasing alone. For example it start from for example 4.2 kHz and immediately change to 4.3 kHz, 4.6 kHz, 5kHz, then play around 4.5 kHz up and down. I tried different NE555 IC like…
hertz12
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NE555 speaker voltage spikes

I made a NE555 circuit with speaker. It works fine, but when I connect its output to the oscilloscope, I get this view: How could I reduce these voltage spikes? How can I get nice square waves? Or maybe this is normal and I can't do anything? My…
Gyciauskas
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Does a MOSFET require a gate inline or pull up/down resistor when being driven from a NE555

I am trying to run some indicators/flashers on my own made bicycle. I have attempted ready-made automotive flashers but have found the lights don't draw enough current for the 2-wire ones and get weird behaviour. With the 3-wire relays types I have…
Scott
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