Need help about charger circuit

[mark.dawson]

Hello every one,
I need some help.
I want to make a bridge rectifier circuit to give me 6v or 9v DC power from 220v to 250 v . I know the circuit, but don't know which resister and capacitors need to use for getting 6v or 9v . The circuit was same as following figure .

I have seen this circuit in my LED light charger to charge the light's battery.
I want to make a circuit for output volt 6 and 9 v .
Please help me if any one have any idea about this circuit .
Please tell me
R1 = ?
C=? (may b Polyester Capacitor)
for getting 6 and 9 v

 

[davenn]

Hi Mark
welcome to the forums

rectifying direct from the mains like that is VERY dangerous
I would strongly recommend against it it would be too easy to electrocute yourself or some one else under fault conditions.

I would advise you to use a transformer to knock the 240V down to ~ 5V via a transformer and then rectify and smooth it

You will find that people on most respectable forums would advise similar, we just want you to "live long and prosper"

secondly you havent said anything about what sort of battery you want to charge
different types of batteries need different charging methods

cheers
Dave

 

[(*steve*)]

This is VERY DANGEROUS.

The output voltage will rise to over 300V without a load. In addition, the output may be at mains potential.

 

[mark.dawson]

Thanks for ur reply
I know it is very dangerous but I need to use it and have been using from 4 years.
I have no change use any transformer because transformer means a big components.
In my device have no please to use a transformer so I need this circuit if u can help please tell me

and my battery look like as

 

[davenn]

Sorry Mark

This is just too dangerous to encourage continued discussion on
low voltage mains transformers are available in very small packages
I suggest you look at upgrading your PSU to something much safer.
None of us here want to end up being legally responsible for you or anyone
elses death

cheers
Dave

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