Today's Message Index:
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1. 04:03 AM - Re: Analog Volt Meter (racerjerry)
2. 04:33 AM - Re: B&C switches (user9253)
3. 10:42 AM - Re: B&C switches (blues750)
4. 05:06 PM - Re: Re: B&C switches (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Analog Volt Meter |
Yes, I 'clocked' the gauges in the race car for instant recognition of an unusual
event. Even so, I found I also needed a BIG red oil pressure light to get
my attention. Many/most aircraft analog gauges are mounted with 4 screws which
makes clocking impractical.
Anyway, even with the compressed scale voltmeter, when charging system problems
arose in flight, my first noticed indication was usually a fading display on
my VHF radio. Not a biggie for me in my old 172K, because I generally stay out
of class D & C airspace and only must save radio for last minute landing announcement
and prepare for a no-flap landing.
Having ANALOG gauges that require no electrical power is a big plus too.
However, like the oil pressure light, charging system problems (and forgetting
to turn darned master off) happen to me often enough that I needed to install
a low voltage warning light to get my attention before battery power was depleted.
I chose Eric Jones 13 Volt Idiot Light. Mounted the light on a tiny aluminum angle
which is Velcroed to top of my glare shield and pointed right at my eyeball
to get my attention. WORKS GREAT! Furthermore, it's powered through the cigarette
lighter and requires no approvals / paperwork install when connected
this way, even on a certified aircraft.
--------
Jerry King
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http://forums.matronics.com/viewtopic.php?p=480511#480511
Message 2
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| Subject: | Re: B&C switches |
https://www.mouser.com/Electromechanical/Relays/Automotive-Relays/_/N-b19z1Z1yzvvqx?No=25&P=1z0x3ubZ1z0x3x8Z1z0x3c8Z1z0x3caZ1z0x1q9Z1z0x2rfZ1yzmqzwZ1z0x0x7Z1z0z812Z1z0jzjlZ1z0z5i5
Small relays draw about 1/10 of an amp. A 1 amp circuit breaker should be fine.
I would add a diode across the relay coil with the banded end connected to
positive. A diode will short out inductive voltage spikes to minimize arcing
across switch contacts. Even a little 1N4148 diode will work, although its wire
leads are not robust.
--------
Joe Gores
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http://forums.matronics.com/viewtopic.php?p=480514#480514
Message 3
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| Subject: | Re: B&C switches |
Thanks Joe...good info!
Dave
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http://forums.matronics.com/viewtopic.php?p=480521#480521
Message 4
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| Subject: | Re: B&C switches |
At 12:40 PM 5/30/2018, you wrote:
>
>Thanks Joe...good info!
Geesh . . . you guys wont let me get away
with anything . . . forgot the diodes . . .
go get the drawing again.
Thanks for the heads-up!
Bob . . .
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