vintage amp and volt meter

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Sarch Lalaith

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Jun 7, 2013
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Hey guys, odd question, I need to know how to wire in a ww1 volt and amp meter to my computer, the amp meter must be on a system that goes from 0 -8 amps tops and the volt meter 0 - 15 volts tops.

You see my case is an old radio from the signals corps and I think it a terrible waste to not use these vintage pieces. to make the most of them they'd be on a system that's fluctuate around the middle-ish. It'd be a really lovely touch. I know it's an oddly specific question.

If anyone's wondering the amp meter is a type dw 44 sc is 89 and the volt meter is a type aw-41 {a.c d.c so I imagine it does both} sc is 122

Ok guys weird question I know thanks for any helps here
 
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Sarch Lalaith

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Jun 7, 2013
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last pc I had I spliced a tuniq tower rpm regulater into the cpu cooler so I'm ok with splicing.

I have an icore 5 unlocked 3750k, a MSI Z77A-G43-GAMING MB, 2 asus ares {wondering whether I should bother putting them in sli or not since only one pci slot seems to be x 16}, be quiet pro 1200w psu {modular}, Phanteks black cpu cooler, 8GB DDR3 2133 MHz CAS 11-11-11-27 corsair vengence single set of duel channel, 2 old hdds one 10k rpm 90gb, one 7200rpm 3tb and an Samsung 256GB 840 Pro Series Basic SSD... think that's everything
 
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manofchalk

manofchalk

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May 11, 2012
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The volt meter wont get much activity (and if it did, that's a problem) but the ammeter should suitably go nuts depending on the load your putting the rig under.

The way I would do it is get an extension cable for whatever you want to hook up, and splice those wires rather than the PSU cables. With the Volt meter you will have to be careful you dont create a short circuit, as the only voltage drop your going to see would be from a 12v and a Ground rail, but directly hooking those up is going to cause issues. Dont know how you will get around that, maybe some very tricky use of diodes.
You may want to buy yourself a Generic PSU to practice on, much better you kill a $15 POS rather than whatever your using in your rig.

If your motherboard offers voltage checking points (MSI typically do this) then you could just directly solder the leads to that.

Ammeter will be simple enough to do, just make sure its not so high a resistance to cause issues a significant voltage drop.
 
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Sarch Lalaith

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the amp meter could be spliced in to the PSU to MB power supply, the 20 pin... but I am not sure which one of the 20 pin cables to splice, any amp meter goes in parallel so that's be easy for me as it shouldn't interfear ...but...

the volt meter is the one that really stumped me, as you say it's a tricky f***er has to go in series so where would I go with that that has a circuit that does a little jumping? 12v rail is a great idea.. but honestly, I'm not sure I'm competent enough to do that... do you have any other ideas on that friend?
 
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Someone Somewhere

Someone Somewhere

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Sep 23, 2012
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I'd put it in the yellow wires from your PSU to the CPU power connector - when you stress the CPU, it will go crazy.

Parallel the two yellow wires together and feed them through the ammeter - should be under 8A (96W) unless you go really crazy on the OC.

Ammeter goes in series - cut the wires, put the ones from the PSU in one end, and the ones continuing to the CPU in the other.
 
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Sarch Lalaith

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thank you people. some great ideas here.

I had an idea about the volts as the fellow above says I can use the voltage checking points on the MB the problem is the tiny Pd, what if I was to use some form of transformer to kick the voltage up on the way into the volt meter and one on the way out to put it back to normal? assuming I could find two tiny tiny transformers?
 
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Someone Somewhere

Someone Somewhere

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Sep 23, 2012
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Just got your PM. To convert DC into AC you need an inverter, and that is not only large, but it also draws more power than you could pull from those points and it usually messes with the voltage.

You could put it elsewhere, but there's nothing that changes much at close to 12V except for fans. Might be able to do that though - I'll have to drag out the oscilloscope and have a look at the PWM signal.

FYI: Please don't PM me - I basically have to google to find the thread. I'll spot any replies to a thread I've posted on though.
 
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Sarch Lalaith

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oh ok... sorry didn't mean to be a dick. in regards to the fans from what I can see they each run at 1.2v {what is says on the label} maybe I could somehow put the volt meter between a full bank of 8 fans all connected in series via molex to the PSU, voltmeter between the PSU and the first molex should then be registering around 10ish volts right??? or am I just being a dumb arse?

that would work right? or would having 8 fans molex connectors in series cause too much power drop and the fans slow down?
 
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manofchalk

manofchalk

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Fans run at 12v, chances are that 1.2v is a minimum starting voltage.
You should see 12v on either side of the fans, assuming nothing else is connected further along the line.

Fans consume a tiny amount of power, the PSU should easily be able supply the amperage to deal with that load.
 
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Sarch Lalaith

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so I shouldn't expect to see the fans slowing down for being connected in series then?, you know stacking the molex connectors
 
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