power supply circuit

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sivamit

Joined: 01 Dec 2005
Posts: 197
Helped: 5
Location: India

12 Oct 2006 6:51 power supply circuit

Hi,
i want to design a power supply for +/- 15 V and 9 V output. The input to the unit is 230VAC supply. Can anyone give me a circuit to implement this ..
please.....
And which power supply is better tranformerless or tranformer circuit?
Please suggest....

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IanP

Joined: 05 Oct 2004
Posts: 6490
Helped: 1542
Location: West Coast

12 Oct 2006 7:14 Re: power supply circuit

Go for something that you can easily build ..

Here is an example of dual-polarity regulated power supply ..
http://orca.st.usm.edu/~jmneal/dual_psu/
Just add another section with LM317 voltage reguator and adjust output to 9V ..

Alternatively, and without many changes, you can replace LM317 and LM337 adjustable regulators with the following fixed regulators:LM7815 (+15V output), LM7915 (-15V output) and LM7809 (+9V output) ..

Regards,
IanP

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