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Old Jan 1, 2020 | 02:28 PM
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Default Adjustable DC Power Supply?

Any recommendations on one of these without spending too much? Learning to do some bench testing on my gauges. It’s getting too cold in Detroit to be working through these electrical issues outside!


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Old Jan 1, 2020 | 02:42 PM
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I made one from an old computer tower power supply, it's not adjustable though it's a stable 12vdc
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Old Jan 1, 2020 | 02:52 PM
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If you have an old car battery and a charger, you are in business already...

As to variability, if you are tweaking various sources to see what the gauges do, a voltage divider will do the trick

Otherwise look here:

https://www.sciplus.com/s/?q=dc+power+supply

for a few choices of commercial sources, I've got the lab supply or something very similar and you can set a current limit which is a nice feature. Might be made in China, though.

One additional note, if you want to replicate the car's voltage, when it's running, the supply side is more like 14 VDC, so you would want some adjustability in your supply.

Last edited by ignatz; Jan 1, 2020 at 04:33 PM.
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Old Jan 1, 2020 | 05:53 PM
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Here you go-

Back in the day - 20+ years the company I worked for was a distributor for these power supplies. I have a couple that have been used (and abused) and still work great!! They still look the same!

Astron- Made in the USA and a 7A piece with 13.8VDC is under $80.

https://www.universal-radio.com/cata...ps/astron.html

https://www.universal-radio.com/catalog/hamps/2506.html









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Old Jan 1, 2020 | 06:53 PM
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Look on ebay for an old bench dc power supply, they can be had for next to nothing(30/50 bucks) and easily found. I’d be lost without mine.
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Old Jan 1, 2020 | 07:21 PM
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So I know I want adjustable voltage. I know the battery ranges from 12V-14V. The highest amperage fuse/breaker I see in the fuse block is 30A for the power windows (which don’t want to work either). Do I need to buy one that handles max volts & amps?
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Old Jan 1, 2020 | 08:09 PM
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I have been using one of these a lot lately.......it is the bomb dot com:

Amazon Amazon

Shoot power anywhere you want.......check anything you want on the go......

Jebby

Last edited by Jebbysan; Jan 1, 2020 at 08:10 PM.
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Old Jan 2, 2020 | 03:17 PM
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... and do I want linear or switching supply?
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Old Jan 2, 2020 | 03:40 PM
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Originally Posted by Emeightch
... and do I want linear or switching supply?
If it's sitting on the bench- a linear type would be the best- it's quieter- cleaner but heaver and generates more heat-

A 30 A will run anything you have in your car ( not all at the same time) except the starter.

Again- I really don't know what you want to accomplish...

I have my big power supply on the bench to test wiper motors-electric headlight motors- headlights-fans- car audio amps-

When I'm working on a car- I'll have the battery in place and use the 7A connected to the battery to keep it charged while I test various electrical- it ensures the battery has a fully charge with out starting it.

MOST battery tenders- chargers tend to be really noisy- especially if you are doing a radio or electronics - as they are not filtered as good as a power supply.

Richard
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Old Jan 2, 2020 | 05:21 PM
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Default La Volta DC power supply...'twas cheap.

Here is mine...and I love it....If it was a car it would have a million miles on it.

amazon cheap! years and years of service! $90 delivered.

Last edited by L-46man; Jan 2, 2020 at 05:28 PM.
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Old Jan 2, 2020 | 08:13 PM
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So I’ve decided to use up some gift cards from Home Depot... should be more than enough for the bench testing I want to do.

UNI-T UTP3315TFL-II Linear DC 0-Volt to 30-Volt/0 Amp-5 Amp Power Supply, Stabilized & Adjustable Regulator W/4 Digit Display.
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Old Jan 2, 2020 | 11:32 PM
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Originally Posted by Emeightch
So I’ve decided to use up some gift cards from Home Depot... should be more than enough for the bench testing I want to do.

UNI-T UTP3315TFL-II Linear DC 0-Volt to 30-Volt/0 Amp-5 Amp Power Supply, Stabilized & Adjustable Regulator W/4 Digit Display.
good deal-

Even though the power supply has built in protection- a few bucks for a fuse holder in line is well worth it!!!


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Old Jan 3, 2020 | 03:48 AM
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Well this is a most interesting discussion and timely for me as well. I've got three mechanical clocks I'm tinkering with, one works and two I need to restore so I'm like Emeightch. Over time, I've found myself testing headlamps, probing in-car components and always have wires running all over the place, clips, probes, whatever it takes.
Originally Posted by Emeightch
Any recommendations on one of these without spending too much? Learning to do some bench testing on my gauges. It’s getting too cold in Detroit to be working through these electrical issues outside!
I get the impression to have a bench source like this UNI-T UTP3315TFL-II Linear DC 0-Volt to 30-Volt/0 Amp-5 Amp Power Supply, as well as something like the Power Probe III Clamshell, are complimentary. Or are they redundant? Apparently, the probe is for work inside the vehicle while the bench source is for testing components on the bench.

Like recently, I used a noisy battery charger on a battery as my 12v source to test a clock, but as noted above...noisy!

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Old Jan 3, 2020 | 01:15 PM
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Originally Posted by hunt4cleanair
Well this is a most interesting discussion and timely for me as well. I've got three mechanical clocks I'm tinkering with, one works and two I need to restore so I'm like Emeightch. Over time, I've found myself testing headlamps, probing in-car components and always have wires running all over the place, clips, probes, whatever it takes.


I get the impression to have a bench source like this UNI-T UTP3315TFL-II Linear DC 0-Volt to 30-Volt/0 Amp-5 Amp Power Supply, as well as something like the Power Probe III Clamshell, are complimentary. Or are they redundant? Apparently, the probe is for work inside the vehicle while the bench source is for testing components on the bench.

Like recently, I used a noisy battery charger on a battery as my 12v source to test a clock, but as noted above...noisy!
The power supply plugs into the wall......the power probe uses a 12v battery. It is up to you how you want to get your power but yes.......they both can do the same thing......

Jebby
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Old Jan 3, 2020 | 06:27 PM
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Originally Posted by Jebbysan
The power supply plugs into the wall......the power probe uses a 12v battery. It is up to you how you want to get your power but yes.......they both can do the same thing......

Jebby
Or you could hook the power supply to the Power Probe...

Basically- The power probe acts as a set of jumper cables NOT as a power source/supply.
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Old Jan 3, 2020 | 06:43 PM
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What about an HO train set DC "power pack" for things like gauges and clocks? Lou.
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Old Jan 4, 2020 | 12:03 PM
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over a hundred new ones to choose from
https://www.amazon.com/s?k=dc+bench+power+supply+variable&i=industrial&crid=1PWXRLWYQRZCN&sprefix=dc+bench%2Cindustrial%2C151&ref=nb_sb_ss_i_2_8 https://www.amazon.com/s?k=dc+bench+power+supply+variable&i=industrial&crid=1PWXRLWYQRZCN&sprefix=dc+bench%2Cindustrial%2C151&ref=nb_sb_ss_i_2_8
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Old Jan 5, 2020 | 03:52 AM
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Anyone see a problem with this DC power supply? I like the green on/off button.

Dr.meter 30V/5A DC Bench Power Supply Single-Output 110V/220V Switchable with Alligator Clip Included, US 3-Prong Cable,PS305DM

https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-included/dp/B00O8DJ8QC/ref=sr_1_9?crid=1PWXRLWYQRZCN&keywords=dc+bench+power+supply+variable&qid=1578212907&s=industrial&sprefix=dc+bench%2Cindustrial%2C151&sr=1-9 https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-included/dp/B00O8DJ8QC/ref=sr_1_9?crid=1PWXRLWYQRZCN&keywords=dc+bench+power+supply+variable&qid=1578212907&s=industrial&sprefix=dc+bench%2Cindustrial%2C151&sr=1-9
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Old Jan 5, 2020 | 09:48 AM
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The Dr. Meter is what I was going to go with initially. The stability was pretty good. It’s also a linear supply.
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Old Jan 5, 2020 | 09:49 AM
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Thinking about a dc power supply also. Would a 30V-10A be better than a 30V-5A for automotive use?
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