Hi Dave there are "high-side" current sensors (Zetex ?) that dont include
the resistor readily available but they need some discrete component help
with LF PAs because they are only rated at about 30volts. An isolated device
sounds ideal, and simplify my idea for a "PA efficiency meter" to tune up
with.
Cheers de Alan G3NYK
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: 01 April 2005 11:25
Subject: LF: RE: TX Cores / current sensors
While we're talking components. For general info:
There is a new series of current monitoring chips available in the USA.
The devices use some form of hall effect device to sense current passing
between two terminals on the IC. The internal electronics converts this
into a
0 - 5V DC output which can be used to e.g. drive meters, a trip circuit
or
the input to an A-D converter etc.
These IC's are designed for high currents. The range goes from about 10
Amps
to 150Amps and all this current flows through the IC (!) Needless to say
that for the larger current range the terminals that carry the current are
very
substantial indeed.
_http://www.allegromicro.com/hall/currentsensor.asp_
(http://www.allegromicro.com/hall/currentsensor.asp)
73
David
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