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Unknown Power Supply
By domwild, Section Controls Posted on Wed Aug 27th, 2008 at 06:28:27 AM MST
From Teraoka Weighing Systems - looks like 12VDC/5VDC

Hi,
Found three power supplies with transformers in a bin at a local scrap yard. Took the transformers off without looking at the voltage ratings (silly me!) as I can get electronic equipment there for free but not if it contains any copper!
Picture follows!
Details: The two Shottky diodes are numbered D5FB60, 600V, 5A. The larger cap is rated at 50V, 2200 uF, the smaller one at 25V, 3300 uF.
Two voltage regulators on the heatsink below are 3052P and 3122P regulators giving me 5V DC and 12VDC, 2 A.
The board is marked "Teraoka" and the web tells me this board is for a weighing system but entering the board number yields no details.
Q.: What sort of an AC voltage can I now safely feed to the two independent Shottkys without magic smoke escaping? Am I right in assuming it must be larger than 12 VAC obviously as that is the largest output voltage but how high can I go? There is no toroid on the board and I can see one variable resistor. Does 15VAC look right?
Thanks.

Unknown Power Supply | 6 comments (6 topical, 0 editorial)

Re: Unknown Power Supply (3.00 / 0) (#1)
by domwild (domwild at hotmail dot com) on Wed Aug 27th, 2008 at 12:37:55 AM MST
(User Info)

Promised photo:

dom There is one thing money cannot buy: POVERTY!

Re: Unknown Power Supply (3.00 / 0) (#2)
by zap (bell47g5a at comcast dot net) on Wed Aug 27th, 2008 at 10:00:58 AM MST
(User Info)

"The two Shottky diodes..."

They look like bridge rectifiers to me... are you sure they're Schottky diodes?

zap

Re: Unknown Power Supply (3.00 / 0) (#3)
by domwild (domwild at hotmail dot com) on Wed Aug 27th, 2008 at 04:21:54 PM MST
(User Info)

Zap,

From memory, I googled the number and that's what it said. Will google again and let you know.

dom There is one thing money cannot buy: POVERTY!

Re: Unknown Power Supply (3.00 / 0) (#4)
by domwild (domwild at hotmail dot com) on Wed Aug 27th, 2008 at 04:28:35 PM MST
(User Info)

Zap,

You are correct. The Shindegen data sheet tells me they are bridge diodes. I do not know where I got the Shottky from.

dom There is one thing money cannot buy: POVERTY!

Re: Unknown Power Supply (3.00 / 0) (#5)
by wpowokal on Wed Aug 27th, 2008 at 10:25:20 PM MST
(User Info)

Dom the two regulators and caps give the answer, as DC through full bridge is 1.41 x AC there is little point in going higher than 12-15V AC.

Any excess volts only adds heat to the regulator, so keep it down.

Allan down under
A life lived in fear is a life half lived.

Re: Unknown Power Supply (3.00 / 0) (#6)
by domwild (domwild at hotmail dot com) on Wed Sep 10th, 2008 at 04:43:27 PM MST
(User Info)

Thanks, Allan, for the info.

How is your battery problem shaping out?

Regards,

dom There is one thing money cannot buy: POVERTY!

Unknown Power Supply | 6 comments (6 topical, 0 editorial)

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