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From: tomb@hplsla.HP.COM (Tom Bruhns)
Newsgroups: sci.electronics
Subject: Re: WAIT! - Re: 12 to 9 volts dc (kinda long)
Message-ID: <5170111@hplsla.HP.COM>
Date: 27 Feb 91 18:03:36 GMT
References: <1991Feb26.235009.1389@cbnewsj.att.com>
Organization: HP Lake Stevens, WA
Lines: 25

dunne@motcid.UUCP (Jim E. Dunne) writes:

>  Can you provide part numbers and makers?  When I was investigating 
>  a power supply for my 9V electric guitar effects, I could only find
>  12, 8, and 5 Volt regulators in the TI book.  I know there are 
>  "adjustable" ones, but I operate on the KISS principle when it comes
>  to circuits!  I'm trying to get 9V from a really dirty 12V wall-type 
>-- 
>  
>  Jim Dunne                    Motorola Inc.             uunet!motcid!dunne

(hee-hee-hee --  you're with Motorola and can't find semiconductors?? ;-)

Try, for example, Panasonic AN7805, -06, -07, -08, -09, -10, -12, -15,
-18, -20, and -24, all from Digi-Key, on Pg. 46 of their Jan-Feb 91
catalog.  Similar series for negative voltages, all at 1 amp max,
and down to 4 volts in a 100 mA series.  But personally, I prefer the
adjustable ones because it keeps my personal parts stock lower, at
very little additional hassle.  And for efficiency, try the new
switching regulator series from National or a similar one from Linear
Technology.  Another favorite of mine is a LM2941CT:  it's adjustable,
and designed so if you _reverse_ the input polarity, it gracefully
stops destructive electrons from visiting your circuit.  Also handles
high input voltages fairly well.  Also has low drop-out voltage (low
input-output differential required for operation).