reducing output voltage from transformer

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mannnish

Joined: 06 Aug 2006
Posts: 201
Helped: 3

11 Feb 2007 18:02 reducing output of transformer

hi ......
i have a transformer that has output of around 12 v and now i need to produced output voltage of 6 volt using some circuit combination how i do it.......?

please help me...

Guachuchon

Joined: 06 Jan 2007
Posts: 40
Helped: 4
Location: Santiago, Chile

11 Feb 2007 20:30 Re: reducing output voltage from transformer

what kind of output you need?? AC or DC

if you need DC output you can use a diode bridge with a voltage regulator (LM7806)

if you only need AC output, you can use a voltage divisor

I hope this can help you

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Sal

Joined: 29 Nov 2005
Posts: 310
Helped: 37

11 Feb 2007 21:15 reducing output voltage from transformer

Hi

If you need dc you can use a circuit like this http://ourworld.compuserve.com/homepages/Bill_Bowden/page12.htm

biw if you need ac, I would disassemblu tje tramsformer and take a middle point from the secondary , it is a hard job but effective, besides you get as much amperage as possible

sal

Guachuchon

Joined: 06 Jan 2007
Posts: 40
Helped: 4
Location: Santiago, Chile

11 Feb 2007 22:04 Re: reducing output voltage from transformer

Remember you must put a thermal disipator in the regulator if you want fiability and durability in your circuit

The Joy of Electronics

Joined: 22 Dec 2006
Posts: 158
Helped: 11

11 Feb 2007 22:23 Re: reducing output voltage from transformer

For DC utilize a regulator using a zener Diod.

raghu_836

Joined: 24 Oct 2006
Posts: 54
Helped: 5

12 Feb 2007 11:18 Re: reducing output voltage from transformer

u can use another smaller transormer to reduce the voltage for ac
and for dc u can use one of the rectifiers .

nguyennam

Joined: 06 Sep 2006
Posts: 459
Helped: 28

13 Feb 2007 15:05 Re: reducing output voltage from transformer

If it is stepdown transformer 220-12VAC and then you need 6VAC so you can:

1. Plug this transformer to 110VAC outlet instead of 220VAC as usually.
or:
2. at secondary winding, connect in series with the load a resistor of the same resistance with your load. Of course you need to use the right resistor with the suitable power dissipation.

Of course the best solution is buying the new 6VAC transformer, it is really not hard to be found nowadays.

nguyennam

maharshi_qis

Joined: 14 Feb 2007
Posts: 247
Helped: 6

14 Feb 2007 12:38 Re: reducing output voltage from transformer

u can use a potential divider network..right?
also it depend on whether u need ac or dc o/p.
u can also use ac volatage controller r diode dridge.

zuisti

Joined: 02 Jul 2004
Posts: 48
Helped: 2
Location: Hungary

19 Feb 2007 12:13 Re: reducing output voltage from transformer

Hi!

A fast solving (not a humour):

Put a small power (trying!!) 220v filament lamp serially to the primer circuit!
But you must measure the output voltage at your load (first a resistor only)!!

zuisti