[sdiy] zener question

[Happy Harry]

I would make a case for the zener diodes.  If you have a reasonably
stable current draw, and not too much power dissipation... the zeners can be 
very effective. ESPECIALLY in high electrical noise environments.. where 
regulators can screw up. The regulator could overshoot, oscillate, etc... 
zeners don't do that.

Synths are reasonably low electrical noise... the regulator would
work just fine... Of course 12V vs 9V is only three volts, just on the
verge of dropout for some regulators !!!

H^) harry


>From: Michael Buchstaller <buchi at takeonetech.de>
>Reply-To: buchi at takeonetech.de
>To: synth-diy at node12b53.a2000.nl
>Subject: Re: [sdiy] zener question
>Date: Mon, 05 Feb 2001 17:30:58 +0100
>
> >If you need something well regulated with a fair amount of current (over
> >50mA or so), you should go to an adjustable voltage regulator - like the
> >uA723, or LM317 (positive reg) and LM337 (negative reg).  With heat
> >sinks you can get up to 1 amp out of these, 100mA with no heat sink.
>
>personally, i would always go the voltage regulator route - 7809/7909
>are extremely cheap and will do the trick without any worrying about
>how much current the circuit draws (in terms of a few 100 mA, of course)
>
>
>-Michael Buchstaller

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