Today's Message Index:
----------------------
1. 09:35 AM - Re: Z18 LOM Installation Question (Eric Page)
2. 09:12 PM - Re: Instrumentation amplifiers (Robert L. Nuckolls, III)
3. 09:16 PM - Re: Re: Which Oil Pressure Switch? (Robert L. Nuckolls, III)
4. 09:25 PM - Re: Re: Z18 LOM Installation Question (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Z18 LOM Installation Question |
That MSD noise filter is almost certainly a Nippon ChemiCon U36D series capactor (like this one (https://www.digikey.com/short/52pftq70)) with a red shrink-wrap over it and the price wildly inflated.
Here's the mounting bracket (https://www.digikey.com/short/b3mrf2h9).
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513431#513431
Message 2
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| Subject: | Re: Instrumentation amplifiers |
At 07:44 PM 3/21/2024, you wrote:
<finn.lassen@verizon.net>
>
>Trying to measure pressure in front of my
>radiators to somehow get uniform airflow through entire rad surface.
>
>A few years ago I bought 5 MPX10DP 10kPa
>(1.45psi) pressure sensors because they were relatively inexpensive.
>
>Been measuring 1" from each corner and center.
>But have now added steering vanes in # pattern
>-- in other words rad surface now divided into 9 squares.
>
>Throwing good money after bad I just ordered additional 4 MPX10DPs.
>
>Problem=C2 with the MPX10 sensors is they are not
>amplified (nor temperature compensated). Only
>outputs 35mV/10kPa. However outputs are offset
>at about 2.5V when fed 5V. Basically wheatstone bridge.
Last time I worked at those voltage levels
was to instrument some strain guages in the
pitch trim system of a Beechjet about 25
years ago. Chopper stabilized op-amps are
handy for this task. The parts I used back
then are long obsolete but Digikey has a
selection of modern parts:
https://tinyurl.com/23uwab99
Top one in the list seems a likely candidate.
I've attached an exemplar circuit from one
of the data sheets. The precision voltage
supply is a bit arcane, my personal favorite
is also attached. One supply can be used to
power up the array of pressure transducers.
You might read up on using these high gain
systems for conditioning tiny voltages . . .
ecb layouts need some attention for
noise/leakage mitigation and compensation
for local Seebeck effects.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=======
=
< Go ahead, make my day . . . >
< show me where I'm wrong. >
========================
========
In the interest of creative evolution
for the-best-we-know-how-to-do based
on physics and repeatable experiment.
Message 3
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| Subject: | Re: Which Oil Pressure Switch? |
At 10:32 AM 3/26/2024, you wrote:
>I have a battery charger that senses vibration caused when the
>engine is started, and uses that as a trigger. I wouldn't have any
>idea how to procure or implement a vibration sensor as a trigger for
>your Hobbs, but I'll bet some of the guys on this list do.
What's the alternator in your system?
PM dynamo perhaps?
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
for the-best-we-know-how-to-do based
on physics and repeatable experiment.
Message 4
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| Subject: | Re: Z18 LOM Installation Question |
At 11:34 AM 3/29/2024, you wrote:
>
>That MSD noise filter is almost certainly a Nippon ChemiCon U36D
>series capactor (like this one
>(https://www.digikey.com/short/52pftq70)) with a red shrink-wrap
>over it and the price wildly inflated.
>
>Here's the mounting bracket (https://www.digikey.com/short/b3mrf2h9).
I ran some tests many moons back to explore
the benefits of fat capacitors on the output
of any alternator but specifically the
PM devices. Copies of exemplar plots
are available at:
http://aeroelectric.com/articles/Alternators/SD-8/SD8_Noise_Plots.pdf
Bottom line is that I could detect no benefit
for having this capacitor in the system.
Noise levels on the alternator's output
were quite nominal and of no operational
significance whether or not the capacitor
was included.
Except for the mitigation of generator/alternator
radio frequency noise in ADF radios, B-lead
capacitors and/or 'purpose designed' filters
haven't been needed for quite some time.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
for the-best-we-know-how-to-do based
on physics and repeatable experiment.
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