Re: Question about Audio Reg Board -5v

Perhaps putting a 120 ohm resistor across the -5 output and gnd would
give enough load so it will regulate?

John :-#)#

Alex Yeckley wrote:
> Some versions of the 7905 fall badly out of regulation under no-load
> conditions. I think the ones that Bob Roberts was selling at one point fell
> into that category. I've seen such 7905's put out -12V under no-load.
>
> Alex
>
> -----Original Message-----
> From: owner-rasterlist@vectorlist.org
> [mailto:owner-rasterlist@vectorlist.org] On Behalf Of Christopher X.
> Candreva
> Sent: Tuesday, July 01, 2008 10:12 AM
> To: Rasterlist
> Subject: Re: RASTER: Question about Audio Reg Board -5v
>
> On Mon, 30 Jun 2008, Matt Rossiter wrote:
>
>
>> be fine. I replaced the 7905 voltage regulator. Then I swapped in
>> another audio Reg board and got the same thing. Why would I be
>> getting -12v instead of -5v? It almost seems like this is normal.
>>
>
> Are you sure you are measuring the correct line ? Try the direct output of
> the reg, the test point (if there is one). My guess is you are on the -12v
> line.
>
> ==========================================================
> Chris Candreva -- chris@westnet.com -- (914) 948-3162
> WestNet Internet Services of Westchester
> http://www.westnet.com/
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>

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Received on Tue Jul 1 13:02:16 2008