Mail Archives: geda-user/2020/12/14/17:30:59

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To: geda-user AT delorie DOT com
From: "Nicklas SB Karlsson (nk AT nksb DOT online) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: [geda-user] Variable voltage supply from fixed
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Date: Mon, 14 Dec 2020 23:11:03 +0100
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Reply-To: geda-user AT delorie DOT com

Distributor do not have variable voltage regulator with the footprint I 
want/need in stock. While most probably possible to come by somewhere 
else I prefer something easy to come by.

It rather simple to make a variable voltage regulator from a fixed one: 
simple resistor divider a little bit low accuracy due to ground current, 
zener diode with some bias current from regulated voltage on gnd pin or 
TL431 or with voltage divider. Anyone here have any experience about 
pitfalls? In particular if there may be instability problems if using 
TL431 or Zener diode likely to be discovered then a little bit to many 
have been manufactured?

Regards Nicklas Karlsson

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