555 Timer Calculator Online Free Tool

555 Timer Calculator – Astable Mode

This tool calculates the frequency and duty cycle of a 555 timer in astable mode. Enter your values below.

Resistor R1:
Enter the first resistor value

Resistor R2:
Enter the second resistor value

Capacitor C:
Enter the capacitor value

555 Timer Calculator Online Free Tool

Use 555 Timer Calculator Online Free Tool to find frequency and duty cycle for your astable circuits. Just enter resistor and capacitor values to get instant, accurate results.

How to Use the 555 Timer Calculator (Astable Mode):

Select the correct units for your resistors (R1, R2) and capacitor (C) — like Ω, kΩ, µF etc.
Enter the numeric values in the input boxes for R1, R2, and C.
Click on the “🔍 Calculate” button.
The tool will instantly show you the frequency (Hz) and duty cycle (%) of your astable 555 timer circuit.
Use the theme toggle to switch between dark mode and light mode as per your preference.

Battery Life Calculator Online Free Tool

🔋 Battery Life Calculator

Battery Capacity (mAh): Current Draw (mA):

Battery Life Calculator Online Free Tool

Calculate battery life instantly using capacity and current draw. Perfect for electronics projects, DIY makers, and embedded system designers.

How to use Battery Life Calculator Online Free Tool

Enter your battery's capacity in milliamp-hours (mAh) and the current draw of your device in milliamps (mA). Click “Calculate” to instantly see the estimated battery life in hours and days.

LED Resistor Calculator Online Free Tools

Quickly calculate the ideal resistor for your LEDs using this LED Resistor Calculator Online Free Tools. Enter supply voltage, LED voltage, and current to get instant results

How to Use the LED Resistor Calculator:

Enter Supply Voltage (V): This is the voltage coming from your power source, like a battery or adapter (e.g., 9V).
Enter LED Forward Voltage (V): This is the typical voltage drop across the LED. Common values:

Red LED: ~2V
Blue/White LED: ~3.2V

Enter LED Current (mA): The desired current for the LED (e.g., 20 mA is standard for most small LEDs).
Click “Calculate”: The tool will instantly show you the recommended resistor value in ohms (Ω) to safely connect your LED

LED Resistor Calculator

Supply Voltage (V): LED Forward Voltage (V): LED Current (mA):

Ohm's Law Calculator Online Free Tools

Quickly calculate Voltage (V), Current (I), or Resistance (R) using our easy Ohm's Law Calculator Online Free Tools. Perfect for electronics students,

hobbyists, and engineers.

what is ohm law formula? ohm law formula is V = I × R

V represents Voltage, I represents Current, and R represents Resistance in Ohm’s Law (V = I × R).

How to Use This Ohm’s Law Calculator:

Select what you want to calculate from the dropdown (Voltage, Current, or Resistance).

For example, if you select Voltage (V), then:

Enter the Current (I) value in the first box
Enter the Resistance (R) value in the second box
Click Calculate, and your Voltage result will appear instantly!

Ohm's Law Calculator

What do you want to calculate? Value 1: Value 2:

Ohm's Law Formula: V = I × R
Where: V = Voltage (Volts), I = Current (Amps), R = Resistance (Ohms)

how to make beautiful wall clock using household item

In this project we learn how to make beautiful wall clock using household item. its very easy simple and money saving project. for making this project we need some components.

Components:

Wall clock machine.
Wall clock cell
Card board.(i use old cake base)
Print of numbers.

now following few steps and make same.

1st color print of numbers on sticker paper.
Now adjust this paper on cardboard of cake base.
And now attach clock machine on this cardboard.
Now attach time needle.
And finally connect cell with clock machine.

we learn it more batter with watching video.

Video of homemade beautiful wall clock

Total cost of wall clock project:

Total cost of this project roundabout 1$

wallclock machine price is 0.8$ in local market.
print paper cost rountabut 0.1$ in local market
cell cost roundabout 0.1$
and cardboard is free.

How to make 220v universal led tester

In this project we learn how to make 220v universal led tester easy at home. its very easy and simple project. you can test all type of leds. for making this project we need some components.

Components:

Bridge rectifier
3 volt LED
68k resistor
24v zener diode
100k, 1 watt resistor
Shoe switch
Old tester wire

Now follwing few steps and make same.

Connect 1 side of 68k resistor with 3v LED
2nd side of 68k resistoe and LED use for 220v input.
Now 100k 1w resistor connect with 2nd side of 68k resistor.
And now connect bridge rectifire. (you can make bridge rectifier using 4 diodes of 1N4007.
Finaly connect 24v zener diode.

we learn it more batter with watching video

Video of homemade 220v universal led tester

Total Cost of 220v universal led tester:

the total cost of this project round about 0.3$

shou switch cost roundabout 0.2$
zener diode cost roundabout 0.01$
bridge rectifire cost roundabout 0.04$
led cost roundabout 0.01$
68k resistor cost roundabout 0.01$
100k 1w resistor cost roundabout 0.03$

How to rewind armature of drill machine

In this project we learn how to rewind armatore of drill machine. its very easy and simple process.

1st we need some basic information about armature of drill machine.

Its duplex winding.

Pole is 2 north and south.

Segment is 24

And slot is 12.

We know pitch is equal to slot over pole.

12/2 = Answer is 6

Mean we wind in 1 and 6 slot reshow

For more simplify we make a simple chart of slot and segment combination.

Slot	Segment
1-6	1,2
2-7	3,4
3-8	5,6
4-9	7,8
5-10	9,10
6-11	11,12
7-12	13,14
8-1	14,16
9-2	17,18
10-3	19,20
11-4	21,22
12-5	23,24

Now we wind very easily with the help of this chart. simple put a number on armature slot and segment. and start winding with the help of this chart.

Video of rewind armature of drill machine.

What is duplex winding?

if segment is 24 and slot is 12 so its duplex winding.

if segment and slot both are equal then its called simplex winding.

if segment is 36 and slot is 12 then its called triplex winding.

How to make bearing puller within 2 mints

In this project we learn how to make bearing puller within 2 mints. its very usefull tool. you can open your drill machine bearing very easily.

For making this project we need some components.

3 Screws
Iron or any hard metel piece.

I use a small piece of aluminum sheet. 1st do 3 holes in this sheet. now 2 screw connect in 1st hole and 3rd hole of sheet. and 3rd screw connects the middle hole but in the opposite direction.

your job done.

we learn it more better with watching this video.

video for making homemade bearing puller

Total cost of this project:

its total free for me. but rufly if we calcuate then 3 screw cost rounabout 0.3$

How to make 5v to 1.5v converter circuit

In this project we learn How to make 5v to 1.5v converter circuit easy at home. you can run your wall clock, your calculator and all 1.5v products using this circuit. we make this circuit only 3 componets with the help of circuit diagram. you can also convert your 3.7v mobile and litheam battery with this curcuit.

for making this project we need some components

LM317 Voltage regulator
470ohm resistor
100 ohm resistor
soldering wire
soldering iron

Now following this steps and make same

LM317 has 3 pin, connect 470 ohm resistor between 1st and 2nd pin of regulator.
Now one side of 100 ohm resistor connect with1st pin of regulator.
2nd side of resistor use for negative input and negative output.
3rd pin of regulator use for positive input.
And 2nd pin of regulator use for positive output.

Video for 5v to 1.5v converter circuit

Total cost of this project:

Total cost of this 1.5v converter circuit is round about 0.105$

lm317 voltageregulator price is 0.1$ in local market.
And 2 resistor price is 0.005$ in local market.

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555 Timer Calculator – Astable Mode

555 Timer Calculator Online Free Tool

How to Use the 555 Timer Calculator (Astable Mode):

🔋 Battery Life Calculator

Battery Life Calculator Online Free Tool

How to use Battery Life Calculator Online Free Tool

LED Resistor Calculator Online Free Tools

How to Use the LED Resistor Calculator:

LED Resistor Calculator

Ohm's Law Calculator Online Free Tools

How to Use This Ohm’s Law Calculator:

Ohm's Law Calculator

how to make beautiful wall clock using household item

Components:

Video of homemade beautiful wall clock

Total cost of wall clock project:

How to make 220v universal led tester

Components:

Video of homemade 220v universal led tester

Total Cost of 220v universal led tester:

How to rewind armature of drill machine

Video of rewind armature of drill machine.

What is duplex winding?

How to make bearing puller within 2 mints

video for making homemade bearing puller

Total cost of this project:

How to make 5v to 1.5v converter circuit

Video for 5v to 1.5v converter circuit

Total cost of this project:

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