Voltage Doubler Using 555

A 555 timer IC is probably one of the most used IC in electronics. Here is a simple diagram of voltage doubler using the 555 timer IC.

Components needed:
You can figure out the components needed from the circuit diagram itself.

Note:
You can use many of the other variations of the 555 timer IC. As in here it is NE555, but you can use LM555 or any other variation.

Working:
The 555 IC is in  astable multivibrator mode.
First Half: When the output of our multivibrator is low, Q1 (because it is NPN transistor) will be OFF and Q2 (because it is PNP transistor) will be ON. So the negative terminal of capacitor C3 will be connected to ground. It will charge from the power supply and through the D1 diode.

Second Half: When the o/p of multivibrator is High, Q1 will be ON and Q2 will be OFF. . The C4 capacitor will be charged by the voltage of C3 capacitor. But its discharge through transistor Q1 is blocked by D1 diode. Discharge of C4 through Q1 during next half (that is low voltage of the multivibrator) is blocked by D2 diode.

Now, What will be the total o/p????

It will be sum of C4 voltage and the supply voltage. So it will be nearly doubled.

Note:

1. The o/p will be nearly 18v for 12v supply.

2. These are specifications for a frequency of 9KHz. But it can be varied by varying the values of R1 and C1.

3. The o/p current will be max of 50mA. So observe the voltage and calculate the current the load resistance according to that.

Hope you will find it interesting and helping....

Leave your response and requests in the comment section below....

Thanks for visiting...

Follow the blog if you like my efforts... :)

12v DC to 240v DC Voltage Inverter

The basic difference between last post of 12v DC to 240v AC and this circuit is that there is a Bridger Rectifier added at the o/p of the transformer. And there are some p-n diodes added so that the reverse current is not allowed and the circuit is safe from accidental reverse currents.

Components needed:
You can easily figure out the components which are needed for this circuit from the diagram.

Working:
This circuit contains the  555 as an astable multivibrator. Diode D1 is added to ensure the 50% duty cycle of the multivibrator. For half of the time Q1 is OFF which is driven by direct voltage coming from the multivibrator. To be specific Q1 will be OFF for the time when o/p of multivibrator is low. Now, Q2 is connected to the collector of Q1. So, Q2 will be ON for the period when o/p multivibrator is low and Q1 is OFF. For next period Q1 will be ON and Q2 will be OFF. So this design ensures constant voltage supply for Transistor.
Rest of the work is given to Transformer. It lifts up Voltage to the voltage level needed.


Note:
The capacitors used in the should be Tantalum capacitors because Ceramic or Electrolyte will tend to blast at these type of power operations.

Hope you will find it interesting and helping....

Leave your response and requests in the comment section below....

Thanks for visiting...

Follow the blog if you like my efforts... :)

12v DC to 240v AC Voltage Inverter

This is a very basic and simple circuit which will generate 240v of AC o/p at a frequency of 50Hz given the input is around 10v to 16v.

Components needed:
You can easily figure out what components are needed for the circuit.

Working:
The circuit contains an astable multivibrator using 555. For low voltage o/p of multivibrator, Q1 will be OFF and Q2 will be ON, and for high voltage o/p of multivibrator, Q1 will be ON and Q2 will be OFF.
This ensures regular input to Transformer.
Rest of the process is up to Transformer. A transformer of specific ratio will give the needed o/p of nearly 240v.

Notes:
The capacitors used in the should be Tantalum capacitors because Ceramic or Electrolyte will tend to blast at these type of power operations.

Hope you will find it interesting and helping....

Leave your response and requests in the comment section below....

Thanks for visiting...

Follow the blog if you like my efforts... :)