[sdiy] Best way to get +5 from +-12

[Michael Schulze]

Hey - on a somewhat related topic -

I am running a 1 amp power supply (+15, -15).  It has no fuse.  What rating
and type fuse should I use for this supply?  Perhaps a resettable breaker
instead?

> From: harrybissell at prodigy.net
> Date: Thu, 27 Feb 2003 12:42:37 -0800
> To: bobinvertedsdiy at aol.com
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Best way to get +5 from +-12
> 
> Hi Bob:
> 
> You need a series resistor and a zener (of course)
> 
> Zener (or shunt) regulators are a good choice if
> you only need a small current. They become very
> wasteful of power at larger currents.  They are
> VERY stable and do not ever oscillate or overshoot
> like linear regulators can...
> 
> The 7805 (series) linear regulator is another good choice
> for higher currents.
> 
> If you contact me with the current you think you need
> (you HAVE to estimate this if you want a successful
> design) I can help you with the (simple) math to choose
> the correct components.
> 
> Rule of thumb (for me) I like Zener regulators below maybe
> 20mA tops... I prefer 10mA
> 
> H^) harry
> 
> --------Original Message--------
> 
> From: Bobinvertedsdiy at aol.com
> To: synth-diy at dropmix.xs4all.nl
> Sent: Feb 27 2003 15:13
> Subject: [sdiy] Best way to get +5 from +-12
> 
>> 
>> Content-Type: text/plain; charset="US-ASCII"
>> Content-Transfer-Encoding: 7bit
>> I'm wondering what the best way to get +5 from a +-12 is. Will a guy who
>> really needs to learn more about power supplies run into any problems if he
>> just slaps a 5v Zener on the +12 line? Forgive me if this has been discussed
>> to death before.
>> Robert 
>> [[Attachment Removed]]
> 
> 
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