Todd;
Depending on the accuracy you need, the +5V voltage regulator you
suggested will probably work just fine. If you need higher accuracy (not
higher resolution), you will need a +5V voltage reference. These are
similar to regulators but they are low- current devices that are
designed to have much higher voltage output accuracy (some are within
less than 0.2%) and they hold their output voltage with little change
over temperature (some less than 10 parts per million per degree
Centigrade) but their disadvantage is that they won't put out much
current and they don't have as wide an input voltage range as a voltage
regulator.
Usually a voltage reference is not needed-- the MAP sensor itself
doesn't have enough accuracy to warrant using one.
Regards, Neil Tucson, AZ
-----Original Message-----
From: owner-land-speed@autox.team.net
[mailto:owner-land-speed@autox.team.net] On Behalf Of todd
Sent: Monday, August 29, 2005 6:44 PM
To: drmayf; LSR
Subject: Re: GM 3 Bar MAP Sensor
Mayf, 5 volt feed is what's needed, and this will aslo keep the output
limited to a max of 5v of course to protect the input of your logging
device.
If a 5 volt source is not available... the BMP and MAP sensors work fine
fed
off a standard 5volt regulator from radio shack(#276-1770) that's being
powered by your regular battery source, as does any of these sensors
that use
less then 1amp(and this regulator is very forgiving of input voltage
surges
up to about 30volts).
Todd
> Does anyone have any particulars regarding the use of a GM MAP
> sensor (2 or 3 bar) as a boost pressure measuring device? I have a 5
> volt reference signal available and can log 0 to 5 volts (more if I
> use a resistor dividing circuit). What does the MAP sensor need? I
> see power, ground and signal return: what volts does it need?
> mayf
|