[time-nuts] Switching regulator 12 > 4 V (3.3)

[KA2WEU at aol.com]

Thanks, I came too late into this discussion, yes the preferred voltage is  
3.3 V, but if decoupled by a emitter follower , maybe 4 V is a good  choice.
 
Can you please copy /past me the info?  Thanks Ulrich 
 
 
 
 
In a message dated 12/4/2016 3:12:18 P.M. Eastern Standard Time,  
jimlux at earthlink.net writes:

On  12/4/16 11:46 AM, KA2WEU--- via time-nuts wrote:
> Who has a good  recommendation for a switching power supply circuit, 12V 
DC
> in, 4 V/  500mA out , Exactly 3.3 for IC voltage.
>
do you need 4V or  3.3V?

I'd start with one of the modular parts we've been  discussing.  They 
typically have 9-18V input range and whatever you  want out.

Since I have the Mouser search page up, P78A03-0500 is $3.71  in qty 1, 
3.3V out @ 0.5A, 6-28V in.  ABout 85%  efficient
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