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From: Winfield Hill
Subject: Re: 1.6V zener diodes?
Date: 14 Oct 2002 07:04:27 -0700
Organization: Rowland Institute
References: <email@example.com> <7Vyq9.firstname.lastname@example.org>
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Phil Allison wrote...
> Bernard Tyers wrote in message
>> I'm looking for 1.6V zener diodes, without much success..
> ** Have you thought of using a Vbe multiplier? One transistor
> and two resistors is all it takes - 1.6 volts can be set with
> a 1k5 from C to B and 1 k from B to E.
Bernie, your required voltage is above 1.24 volts, so you can
make low-Z temperature-compensated zeners from NSC's LM385-ADJ
adjustable-reference ICs. These come in a TO-92 package like a
small transistor. Use say 33k from the FB feedback pin to the
+ terminal and 33k *0.36/1.24 = 10k from FB to the - terminal.
Because the FB pin only draws 13nA, a divider-chain current of
37uA is more than sufficient. You'll get accurate zener action
over a 0.05 to 20mA range. Get NSC's .pdf file data sheet, and
some free samples, http://www.national.com/pf/LM/LM385-ADJ.html
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