Today's Message Index:
----------------------
1. 06:44 PM - Current instrumentation for flight testing. (Robert L. Nuckolls, III)
2. 09:47 PM - Time delay on relay needed (rparigoris)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Current instrumentation for flight testing. |
Dan,
Don't recall if I've sent you this suggestion yet so just
in case . . .
There'a a dirt-cheap line of hall effect current sensors
you might consider for AC measurements on the
alternator study.
https://tinyurl.com/2gvhny4z
These can be used for either AC or DC measurements. They
feature a VCC/2 output for zero current. Hence, DC currents
are resolved by subtracting 2.5V from output. For AC, you
capacitively couple an AC voltmeter to the output. Use
a TRUE RMS reading voltmeter . . . waveform of the AC current
under light loads will be really wonky so an averaging
meter would suffer considerable error.
You can run a 'scope on the output along with the voltmeter.
The output waveform will be a good representation of
the signal in question.
I used to have a few of these laying around but can't
put my hands on 'em at the moment. May have left them
on the last job. I like to keep some around 'cause they're
so easy to use and the price is certainly right!
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Time delay on relay needed |
Hi Group
I am working on a project where an Arduino is completely unhappy if a 12 volt buzzer
is connected to it's 10 amp relay. We tried an awful lot of things including
installing another relay and even a separate battery to power the second
relay and buzzer. the only thing that works is putting the buzzer on the Arduino
relay if you wait one second. Then all is well.
Question:
Can someone point me to a 12 volt coil relay with a approx. 1 second time on delay
that can handle 2 amps or more 12VDC? Or how can I delay the 12 volt relay
i have from coming on for a second.
Thx.
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508044#508044
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|