S.o.s help nb

louishenri · Apr 12, 2010

I want to know if ther is a 240v ac to 9v dc transformer and if possible, directions to build one. very urgent.

bychon · Apr 12, 2010

There is no such thing as a DC transformer. Neither the input side or the output side will work with DC current.

ericgibbs · Apr 12, 2010

louishenri said:
I want to know if ther is a 240v ac to 9v dc transformer and if possible, directions to build one. very urgent.

hi,
If its 240V AC as you say, then you could buy a 240Vac to 12Vac transformer and add a rectifier, capacitor and 7809 regulator to give 9V DC.

Is this what you are asking for.?

Hero999 · Apr 12, 2010

You can buy wall plugs with both a transformer and rectifier integrated to give 9VDC.

**broken link removed**

How much current do you need?

transistor495 · Apr 12, 2010

louishenri said:
I want to know if ther is a 240v ac to 9v dc transformer and if possible, directions to build one. very urgent.

If it is so urgent then try salvaging the transformer and rectifier parts from old equipments like radio-cassette player.

JeanTech · Apr 12, 2010

Hi Louis

Have a look at this variable power supply circuit. You can adjust the output to up to 24V. It can source up to 5A current.

Power Supply

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