Re: Low Zener Voltage?
- From: John Popelish <jpopelish@xxxxxxxx>
- Date: Sat, 28 Jul 2007 21:37:31 -0400
eromlignod wrote:
Hi Guys:
This is a simple one. I've got a 0 to 5V square wave that I want to
convert to a 0 to 3.3V square wave. I tried putting a series resistor
and a 3.3V zener diode to ground.
The wave stays nice and square, but it comes out as 0 to 2.0 volts. I
have tried varying the value of the resistor, but it doesn't help.
What am I doing wrong? Is there a better way to do what I'm trying to
do?
A better answer depends on several things. What is the frequency of the square wave? How fast must the rise and fall times be?
What is the source of the 5 volt wave? How much load can it tolerate before sagging too much?
What load will be places on the 3.3 volt output?
Some possibilities:
2 resistor divider.
Resistor and green LED divider.
3.3 volt linear regulator, e.g.:
http://www.zetex.com/3.0/pdf/ZMR330.pdf
Resistor and 3.3 volt shunt regulator.
.
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