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kentrush
19-Aug-2022, 08:51
I obtained an old Photronix Delta III densitometer but it has no power cord. Can I just simply wire it up to standard 110v current or would the original cord have had a transformer to change the voltage?

Thank you,

kentrush
bmikiten
19-Aug-2022, 08:57
What connector does it have? If it is a small round (ex: 3.5mm) then you need an external power supply.

Brian
kentrush
19-Aug-2022, 09:59
Brian,

Thanks for your help. Am I able to attach a photo of the connector to this message? Sorry, I'm new to this.

Kent
bmikiten
19-Aug-2022, 19:57
Brian,

Thanks for your help. Am I able to attach a photo of the connector to this message? Sorry, I'm new to this.

Kent

You should be able to do that.

Brian
bmikiten
19-Aug-2022, 19:59
It appears to need an AC to DC supply.

Brian
koraks
20-Aug-2022, 08:06
Can I just simply wire it up to standard 110v current
No!

If the photo on this expired eBay ad is still current: https://www.ebay.com/itm/255540449394
You need a 12VDC wall wart with center-positive jack. Those are very common. The adapter on the cited page shows 600mA if my eyes don't fool me; anything higher than that will also be OK. So a 12VDC 1000mA adapter for instance would be good.

Edit: the schematic on this page shows 15VDC: https://www.photrio.com/forum/threads/fs-photronix-densitometer.64325/
I don't know how much if anything it will be thrown off by running it on 12V instead of 15V. Either voltage is well within the range of the 741 opamp, which is the most critical component in terms of voltage rating. Not sure about regulator VR1, which is likely something LM317-ish and should be fine up to 20V or thereabouts.
kentrush
20-Aug-2022, 08:47
230213

I hope this image comes through for you!

Kent
kentrush
20-Aug-2022, 08:51
230214

Thanks, here is a photo of the power cord attachment.
BBW
20-Aug-2022, 09:15
You ca n find 15V wall warts. They are not common but are available. Or if you are handy, you can just build one.
kentrush
20-Aug-2022, 09:56
15v and not 12v? And would I simply wire the connecting end directly into the unit since the jack would not have the same connection? Thank you so much for your help!

Kent
ic-racer
20-Aug-2022, 10:31
I have a couple of AC wallwarts in my "box of old wallwarts." So, just like to emphasize "DC" in your power supply search because AC ones are out there.