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  #11  
Old 02-04-2020, 07:33 AM
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Saville Saville is offline
 
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Quote:
Originally Posted by majuro15 View Post
Get a power supply and set it up for ground power. It'll be handy when the plane is done for updating databases, testing, playing around, etc. I got mine from Amazon as well.
That's what I've been thinking....because software updates are the wave of the future it seems.
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  #12  
Old 02-04-2020, 07:49 AM
lr172 lr172 is offline
 
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Quote:
Originally Posted by Walt View Post
I suggest you just run it off a 12v battery and charge it when you're done.
+1

This is what I do most times. Always seem to have an old battery laying around the shop. I also built a little LM317 based variable power supply years ago for tasks requiring an amp or less. Only costs a few dollars in parts.

Larry
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  #13  
Old 02-04-2020, 07:53 AM
lr172 lr172 is offline
 
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Quote:
Originally Posted by Saville View Post
I thought about that. But I wondered about how clean the power is when coming directly from a battery, and if that would matter.

I also wondered about any spiking when you close the switch to the battery.
A battery is the cleanest source of power and will be substantially cleaner than anything coming from an electronic device. Cleanliness is related to things like ripple, that are produced when power is converted from AC to DC. Just like your alternator, which also isn't that clean. It is the battery that helps to clean things up.

You close the switch to the battery every time you turn your master off in your plane.

Larry
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  #14  
Old 02-04-2020, 08:00 AM
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Saville Saville is offline
 
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Quote:
Originally Posted by lr172 View Post

You close the switch to the battery every time you turn your master off in your plane.

Larry
True BUT...I close the avionics switch (power up the avionics) after I've started the engine and everything is settled.

I open the avionics switch to the avionics BEFORE I shut down the engine and BEFORE open the Master.
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Last edited by Saville : 02-04-2020 at 08:09 AM.
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  #15  
Old 02-04-2020, 08:01 AM
DRMA DRMA is offline
 
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I bought a power supply sold for use with Ham Radios. So far it has been great, very stable, good current capacity, and quiet.

I purchased the Astron SS-50M supply from GigaParts.com. https://www.gigaparts.com/astron-ss-50m.html Probably overkill at 50 amps, but I would rather have too much capacity than too little.

Regards,
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  #16  
Old 02-04-2020, 08:34 AM
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SeanB SeanB is offline
 
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I've owned the Samlex SEC-1235M for several years upon the recommendation of friends. It's been great for all the reasons you are contemplating.

https://radiodan.com/misc/samlex1223.htm

Pictured toward the bottom right with Voltage and Amperage meters.
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  #17  
Old 02-04-2020, 08:54 AM
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Saville Saville is offline
 
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Quote:
Originally Posted by SeanB View Post
I've owned the Samlex SEC-1235M for several years upon the recommendation of friends. It's been great for all the reasons you are contemplating.

https://radiodan.com/misc/samlex1223.htm

Pictured toward the bottom right with Voltage and Amperage meters.
That one looks good.

What have you arranged to take the power from the connectors in the back to a bench setup of your electronics? What gauge cord from the back?

I was thinking of running each wire from the back to two of these - one for power and one for ground:

https://leeselectronic.com/en/product/1885.html

Basically a ground block with screw terminals and a larger lug for the lines coming from the power supply
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  #18  
Old 02-04-2020, 09:03 AM
DennisRhodes DennisRhodes is offline
 
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Can one of you help me understand why avionics should not be powered via a 12 v dc battery AND external digital charger such as a Battery Minder operated at the same time. Would this not be the same as the alternator charging while the AC is in Service? Because I do this often!!!
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  #19  
Old 02-04-2020, 09:11 AM
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Quote:
Originally Posted by Electrogunner View Post
I bought a C TEK battery charger that is capatible with my battery. The charger has a built in 20A power supply that I use while working on my panel. I've used it for over a year and it works great.
I have 2 of the C-Tek chargers and love them. They come as OEM equipment from Corvettes to Bentleys and other really expensive cars so they're proven good. They have the Power Supply setting that gives great clean power (checked on my spectrum analyzer) and I use them when I'm doing anything in the plane with the engine off.

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  #20  
Old 02-04-2020, 09:21 AM
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SeanB SeanB is offline
 
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Saville, that could work for you.

What I did:
Went to local hardware store and got about 10 feet of multistrand power cord, then crimped large aligator clips with boots on one end, lugs on the other end. This power supply has a header you attach your power and ground to and there is a certain size to keep in mind. I belive that information is in the Owner's Manual, linked on the site.

For my bench, I used two forest of tabs (B&C).
https://bandc.com/product/ground-blo...-firewall-kit/

One for power, one for ground. Kept them far away from each other. I connected to each device off of these with an inline automotive fuse on the positive side.
https://bandc.com/product/in-line-fu...der-atc-style/







This worked great for me. Had no noise and was fully functional on the bench. Just used on/off switch from power supply to operate.
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