[sdiy] 3.3V regulator ?

[Linium]

On Lundi 9 Février 2004 19:38, Michael E. Caloroso wrote:

> Use a zener regulator, zener diodes are readily available in the low
> voltage range.  There is a 4v rail in the VCO card of my Minimoog that
> originally was a voltage divider off the PS rail.  I replaced the
> voltage divider with a zener regulator, using a silicon diode and 3.3V
> zener in series.  Worked great and I didn't get drift from the TC of
> carbon resistors.
>
> MC

Thx to remind me that zener diodes are perfect for that ! And cheap too.
I will either go for the diode idea or the lm317 advised by Dave and Roman.

BTW, what is the purpose of the silicon diode before the zener ? If i 
understand well it will make the voltage drop by 0.6v. So it will produce 
something like 4.4 V from the 5v power line then this will turned into 3.3v 
by the zener. Is it to make the zener produce less warmth ? Or may be to 
protect the CI from an accidental negative voltage ?

Thx,

Linium