Showing posts with label simpleprojects. Show all posts
Showing posts with label simpleprojects. Show all posts
Saturday 27 June 2020
Thursday 25 June 2020
Tuesday 23 June 2020
Thursday 21 May 2020
Joule thief circuit
A joule thief is a minimalist self-oscillating voltage booster that is small, low-cost, and easy to build, typically used for driving small loads. This circuit is also known by other names such as blocking oscillator, joule ringer, vampire torch.
It can use nearly all of the energy in a single-cell electric battery, even far below the voltage where other circuits consider the battery fully discharged (or "dead"); hence the name, which suggests the notion that the circuit is stealing energy or "joules" from the source - the term is a pun on the age-old expression "jewel thief".
components needed
- NPN transistor
- 1k resistor
- led
- 1.5volt battery
- enamelled copper wire
- ferrite core
how to make the coil
we need a ferrite core I salvaged this core from an old CFL.make 30 turns with enamelled copper wire on the ferrite core
please watch the video for better experience
how this works
at first very little current flows through the base and collector of the circuit that will create induction in the primary coil and thus increase in base current and this will increase collector current and this cycle repeated until the saturation. at saturation, the transistor will turn off and the stored energy in the secondary coil flows through the led and which is greater than the input voltage because of the secondary coil in series with input source so. there is a boost in voltage
Wednesday 20 May 2020
How to transfer electricity wirelessly
Steps of Construction
The simple wireless electricity project consist of two parts that is Receiver and Transmitter
Making of Receiver
- Make a coil of 15 turns and connect LED to its ends.
Making of Transmitter
Take a bottle and make a coil of 15 turns on it, leave 3 inch wire to make a loop for central terminal and whirl the wire again 15 times.After completing the coil, three terminals will be obtained.Now take 2N2222 transistor, connect its base terminal to resistor and connect first end of coil and collector terminal to the last end of coil.Connect emitter terminal of the transistor to negative terminal of AA battery.The central terminal of coil will be connected with positive terminal of AA battery.The transmitter is now ready. Place the receiver coil 1 inch above transmitter. You will observe glowing LED.
How this works
The wireless electricity transmission is achieved by oscillating magnetic field
At first battery provide direct current(DC) to circuit.The Direct Current is converted into high frequency Alternating Current (AC) with the help of transmitter circuit.Thisalternating current energizes the transmitter coil which generates magnetic field.Whensecondary coil (receiver) is placed near to the primary coil, the changing magnetic field induces an alternating current in it.
Tuesday 13 February 2018
how to make a heart flasher
how to make astable multivibrator(led flasher)
circit diagram
components
testing
pcb soldering
case for heart
final touch
finished setup
your led heart is ready
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