> This is the diagram I am using, the current draw out is 450 m-600 mA
> only.
> Any circuit improvement required to prevent output voltage oscillation ?



Input capacitor of some sort a good idea (at least).
The 470 uF is larger than usual but is probably OK.
IF input goes short the 470 uF will discharge back into the regulator and
MAY cause damage. If input drops rapidly from other load at turn off this
may be equivalent to going short.

        RM


> 15V      .------.
> -----o---| 7812 |---o----> 12V
>          '--.---'   |
>               |      _|_
>               |      --- 470 uF
>             |       |
>            _|_     _|_
>
>
> This is the diagram I am using, the current draw out is 450 m-600 mA
> only.
> Any circuit improvement required to prevent output voltage oscillation ?
>
> James
>
>
> -----Original Message-----
> From: Padman, Nash [mailto:nash.padman@TL2K.CO.UK]
> Sent: 14 April 2003 7:44
> Subject: Re: [EE]: 7812 Unstable
>
>                 James
>
>                 Can you place a circuit diagram of the your design so we
> can
> analysis
>
>
>                 np
>
>  -----Original Message-----
> From:   Quah [mailto:asiact@TM.NET.MY]
> Sent:   15 April 2003 17:38
> To:     PICLIST@MITVMA.MIT.EDU
> Subject:        [EE]: 7812 Unstable
>
> I am using ST 7812 regulator the problem I face is the voltage out I get
> normally is constant 11.9 or 12.03 V.  Some of the parts after use for
> fews day or 1 month, the voltage out drop to 8.9 V and it is unstable
> waving between 8.9 to 11.9 V. What is the reason of this and how to
> avoid this ?
>
> James
>
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