555 timer

I am trying to trigger a 555 timer using a daylight detector. For daylight detector I planned using a comparator with a potentiometer and a photoresistor. I will be comparing the voltage difference and comparator would turn on or off depending on the amount of light photoresistor gets. The...

Hi everyone, I'm working on a servo motor control circuit using a 555 timer. I have the following circuit (attach the schematic if possible). When I remove the button connected to the 68k resistor, the servo moves to 180° but does not return to 0°. What I want to achieve: When I press the...

⚡ Turn the classic 555 timer into an OR logic gate (or should be a NAND Gate) using just a few components! Ideal for quick prototyping, learning, or DIY electronics projects. Take a look at the link bellow to better understand what exactly is this circuit...

I'm working on a clap-on clap-off circuit to control two devices: a light and a fan. The goal is to have the following functionality: Single Clap: The light turns on with the first clap. The light turns off with the second clap. Double Clap: The fan turns on with the first double clap. The fan...

Hi, I have an application, where external and internal power is available. I'd like the internal power to be supplied for, approximately, 1 minute after external power is removed. I have been trying to use a TLC555I combined with a relay, but the correct solution alludes me... Can someone...

Hi, I'm trying to build a circuit that will cause fans to be on when the power is on, and remain on for 10 minutes after the power turns off (I have separate battery for the fans). So far, I've got it where wire from the battery splits in two, one going straight to an OR gate and one doing the...

i want to create DC Motor Reverse Polarity Cyclic Timer Switch, here i post some pictures that uses 555 timer ic. can anyone make working diagram from pictures? thank you.

This is a system to detect any intruders using ultrasonic sensor . The buzzer should ring if the timer gets triggered . Somebody help me with the simulation using proteus or any other softwares

I am trying to build a simple flashing led circuit with a NE555P, however I have ran into a problem of the LED just constantly staying on. I would appreciate at suggestions on fixing this. The current value I have at the moment are: Ra = 100k ohm, Rb = 470k ohm, Rl = 330 ohm, C = 1uF, and I have...

I need to create an oscillator circuit that works like the following: There are 3 capacitors of equal value. One capacitor charges until it reaches a threshold voltage, and then it is instantly discharged and then the next capacitor gets to start charging. The cycle continues. Only one...

I am trying to use a monostable 555 timer circuit to control a peristaltic pump. But, the timer duration is not consistent. I replaced the fet and motor with LEDs and the timer behaves as expected (on for ~10s with the pot at 1 Mohm). What else do I need to have the timer drive the fet properly...

Hello, I am trying to make a timer circuit that can hold a FET or a relay high for 4 hrs. and low for 4 hrs. 555 timer is the option I have so far and want to make sure that it can stay that long. are there any better options ?

It might be a bit broad but I'd like it to confine on the astable operation of the 555 timer. That would be, generating a signal with a certain frequency and pulse width. Although we can also output sawtooth/triangle signal by using the capacitor connected to the 555, so there's also that...

According to theory the time period for ramp signal generated using the following circuit should be: \[ \frac{2}{3} \frac{V_{CC}.C_{1}.R_{1}.(R_{1}+R_{2})}{V_{CC}.R_{2}-V_{BE}.(R_{1}+R_{2})} \] Now... putting the value of Vcc, R1, R2, VBE, RE... the time period comes out to be around 0.9ms. But...

I am new to 555 Timers and Proteus and I need help to fix a circuit I have built. The intended function of the circuit is as follows. The logic is controlled by an external circuit but it is represented by switches within this circuit to purely test the 555 Timer functionality. The switches...

Hi everyone, I am building a breadboard computer and I want a relatively high frequency clock, no more than 2MHz. I have a LMC555, which has a max of 3MHz, and put it into an a-stable configuration with two 27ohm resistors and a 0.01uF capacitor. But I put an LED on the output and it doesn't...

I have a steeper motor that needs a slower step-pulse to get it moving then a faster pulse to increase speed. It needs to start at 1.25hz then increase to 10 hz in a short amount of time. The 555 circuit will be powered on with a trigger limit switch. Then unenergized once the stepper motor...

Without getting too into the weeds of my project; what I am attempting to do is to control the plugging in and removing of a basic USB device. To accomplish this, I have cut open the USB cable of my USB device and have cut the 5V line. I plan to connect the two sides of the 5V line to two...

Hi Guys, I'm new here, so apologize if this has already been covered. I would like to know when a vehicle that stops at the stop sign in front of my house just hangs out there for an extended period of time. I'm imagining a circuit with a ceramic mic, audio level detector that triggers a WiFi...

It's been forever and a day since I've been here, but I'm dipping my toes back into electronics design Anyways, I have a "dumb" device that's connected to a hat on my Raspberry Pi 4. Unfortunately, due to some signaling issues with the dumb device, if it's on when the Pi powers on, the Pi gets...