prathibha.B

• Oct 4th, 2007

 

It is not possible to increase or decrease voltage without a transformer.
However it can be varied to certain extent that too upto (1-2)V using voltage regulator. In a transformer electromagnetic induction effect is used which helps to vary the voltage to a large extent depending on number of primary and secondary turns. 

gviaud

 Profile Answers by gviaud 

• Nov 28th, 2007

 

It is possible to increase voltage without a transformer.

Example(s):
With a DC source - active Charge pump circuit.
With a AC source - Cockroft-Waton Diode Voltage Multipliers  (just a passive charge pump)

haveasafeday

 Profile Answers by haveasafeday Questions by haveasafeday

• Feb 5th, 2008

 

by ac series resonance circuit. This case happen in trasmission line that recieving end voltage is greater than sending end voltage. But have some negative point also present. This is ferantee effect.

santosh

• Nov 7th, 2011

 

we can step up and down dc voltage using chopper circuit

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 7th, 2011

 

I went through all answer, seems all are correct.... But lemme be more precise..

Except transformer.....

1. CHOPER: It is said to be DC equivalent of AC transformer, so can be used to increase and decrease voltage.

2. CLAMPING CIRCUIT: made with the help of diode and capacitor, voltage can be doubled or tripled

3. Amplifier circuit(like common base NPN transistor): a few voltage signal can be amplified to large voltage signal.

4. INDUCTOR COIL(choke coil of fluorescent light ): It is used for providing high voltage(1200v) across lamp so that gas inside gets ionised and cathode ray start passing through tube.

5. FERRANTI EFFECT(as mentioned above by someone )....