Battery Eliminator for AVO 8?

[cpvh]

Hi All,

It?s many a year since my AVO 8 saw active service, but I dug it out the other day and would like to start using it again.

But rather than obtaining a 15V battery, I?d like to use a PSU (assuming I have / can find something to give the right bolts, and assuming youse can tell me which way around to connect it (All I see is two metal plates where it should go in the battery compartment (the 1.5V cell is still in place and working after 15 years storage!).

What does the team think?

TIA

Chris

[Harry Bloomfield]

[e-mail] formulated on Friday :

I think the usual way to solve it, is a series of button cells made up into a suitable battery.

[spuorgelgoog]

Batteries are available on Ebay for about six quid inc postage.

you can wire two 9 volt PP3 batteries in series with a 5v zener diode, insulate the metal cases and slide them in sideways between the contacts for the correct battery.

a lot more information)

AVO VC1 eliminator

Owain

[spuorgelgoog]

See also this for making a battery

Owain

[Brian Gaff]

I have a feeling at least five years ago you could still get those batteries but they were not cheap and some make like saft.

Brian

[cpvh]

Having had a quick look online, it?s only used for high resistance range. Which I?m not bothered about.

However, I can?t zero the Ohms ranges.

Perhaps the 1.5 V battery is past its best after all.

[Bob Eager]

It's only a D cell. Not expensive!

I got a 15v battery off eBay, and it works fine.

[cpvh]

Yes, I will replace the D cell, but as the 15V only seems to do stuff I?m unlikely to be interested in, I will pass on that.

[Dave Plowman (News)]

My thoughts are an AVO which needed a mains supply rather pointless. Given you can buy far more accurate bench top mains powered units for not a lot, if it's only ever going to be used where you can plug it in.

AVO batteries last a long time. The 1.5v cell is cheap. The 15v once can be made up from button cells.

[whisky-dave]

I've just put 7 AVOs on a shelf in the lab, 3 upside down as they look better like that as smiley meters :-)