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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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 Posted: Mon Jan 25, 2021 11:38 am Post subject: bench power |
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soon as the weather warms up a little [50 deg] i want to run my avionics and get limits etc. set. i have decided i do not want a power supply that could fry something if a knob gets bumped. i have gotten along 50 yrs without a power supply on my bench and can easily live without a variable source.
anyone see any problems with connecting bench power thru the ''cig lighter'' plug in? it's 18 ga wire and i would never pull more than a few amps.
had i read something that powering an alternate field wire is not healthy?
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Ceengland
Joined: 11 Oct 2020
Posts: 391
Location: MS
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| Posted: Mon Jan 25, 2021 1:46 pm Post subject: bench power |
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On 1/25/2021 1:38 PM, bobnoffs wrote:
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soon as the weather warms up a little [50 deg] i want to run my avionics and get limits etc. set. i have decided i do not want a power supply that could fry something if a knob gets bumped. i have gotten along 50 yrs without a power supply on my bench and can easily live without a variable source.
anyone see any problems with connecting bench power thru the 'cig lighter' plug in? it's 18 ga wire and i would never pull more than a few amps.
had i read something that powering an alternate field wire is not healthy?
That's how I get 'shore power' to my RV6. But don't just assume that
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'it's only a few amps'; verify actual load. My panel is probably pretty
typical for VFR panels with 'glass' flight instruments, and the 18 ga
supply wire gets fairly warm. I've just built another cable using 16 ga,
& will see how that goes. If the field circuit concerns you, just pull
the field CB or open the switch.
I understand your concern about accidental OV, but there are numerous
advantages to a fully controllable supply where you can limit current as
well as voltage.
Charlie
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nuckolls.bob(at)aeroelect
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| Posted: Mon Jan 25, 2021 2:00 pm Post subject: bench power |
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| Quote: | | anyone see any problems with connecting bench power thru the 'cig lighter' plug in? |
What is the power source? I used to sell
a power supply in this class for about 3x
the money. Sold quite a few. Builders would
power up accessories on the bench or, on
occasion, power up their airplanes with it.
https://tinyurl.com/y3vww5uv
| Quote: | | it's 18 ga wire and i would never pull more than a few amps. |
It can't do anything worse than not work
and you're not going to crash your workbench.
Certainly gazillions of the things are
still in service in automobiles after
about 100 years . . . so why not?
| Quote: |
had i read something that powering an alternate field wire
is not healthy? |
Not sure what this question is about . . .
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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| Posted: Mon Jan 25, 2021 3:57 pm Post subject: Re: bench power |
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when i use the ''bench power ''source i plan to only power a small part of my panel at a time. a couple amps. my questions are1. is there something i may be applying power to that may cause harm the way i plan to do it and 2. can anything detrimental happen to the charging system if power is applied to the field wire. sorry if i wasn't clear. i know this is kind of ambiguous as panel wiring varies.
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jluckey(at)pacbell.net
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| Posted: Tue Jan 26, 2021 8:53 am Post subject: bench power |
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Hello Bob,
"is there something i may be applying power to that may cause harm.."
Probably the riskiest thing would be that you have power wires reversed on some gizmo/accessory. If you put reverse polarity on a device that is not protected for it, you could ruin it, even if it is turned off. So be sure to triple check polarity.
"...can anything detrimental happen to the charging system if power is applied to the field wire ..."
No. The only issue with having power on the field is that it will heat-up the field inside the alternator and with no rotation there would be little cooling. I don't know your setup but typically you would remove power from the regulator by opening the field breaker.
Another thing to consider is keying-up a transmitter without an antenna. In the old days you could damage the output stage of the transmitter without an antenna load. Another Lister with more knowledge about transmitters might provide more info.
-Jeff
On Monday, January 25, 2021, 04:12:02 PM PST, bobnoffs <icubob(at)gmail.com> wrote:
--> AeroElectric-List message posted by: "bobnoffs" <icubob(at)gmail.com (icubob(at)gmail.com)>
when i use the 'bench power 'source i plan to only power a small part of my panel at a time. a couple amps. my questions are1. is there something i may be applying power to that may cause harm the way i plan to do it and 2. can anything detrimental happen to the charging system if power is applied to the field wire. sorry if i wasn't clear. i know this is kind of ambiguous as panel wiring varies.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500422#500422
</==================
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jan 26, 2021 1:53 pm Post subject: bench power |
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| Quote: | "...can anything detrimental happen to the charging system if power is applied to the field wire ..."
No. The only issue with having power on the field is that it will heat-up the field inside the alternator and with no rotation there would be little cooling. I don't know your setup but typically you would remove power from the regulator by opening the field breaker. |
or having the OFF/BAT/ALT+BAT switch in OFF or BAT
| Quote: | Another thing to consider is keying-up a transmitter without an antenna.
In the old days you could damage the output stage of the transmitter
without an antenna load. Another Lister with more knowledge about
transmitters might provide more info. |
That's sorta true in the vacuum tube days . . . but
still valid for long intervals of unloaded transmission.
Early solid state transmitters were germanium transistors
and fragile compared to modern FETS. It wasn't an
instantaneous thing but yeah . . . long-winded 'tests'
were hard on them.
This also pre-dated built-in SWR monitor circuits that reduce
or shut off drive to output stage if poorly terminated. There
probably hasn't been a VHF Comm transceiver in the last
40 years that doesn't have high SWR protection.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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| Posted: Wed Jan 27, 2021 2:52 am Post subject: Re: bench power |
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thanks for the input. i plan to put a cig. lighter plug on output of the power source. my rv12 is wired to easily handle current for one source at a time thru the cig. plug.
instead of the mapbox, when i open the door on the panel my fuse panel is right there. i will keep the fuse panel empty [ field wire] except for what i am working on.
if i never need a lower voltage from the power supply i can run it thru a bucks regulator which i have.
usually i don't know what i don't know about electricity.
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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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| Posted: Sat Jan 30, 2021 5:02 am Post subject: Re: bench power |
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while waiting for the power supply i ordered i came across some tutorials [u tube] about taking an atx [the power supply in a computer] and converting it to a bench power. easy, and a fun project.
i would take a guess that dell or H.P. or what ever computer mfgr.. has a power supply of ''higher standards'' than a $65 bench power on ebay.
anyway.........everyone has an old computer lying around and i will soon have another bench power made from an atx . 12 volts, that's it, although there are leads for 3.3 and 5.08 volts i have no need. at 12 amps it is plenty for me.
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