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Old 22nd December 2004, 10:08 PM   #1
al2002 is offline al2002  India
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Default Power transformenr wanted

I'm looking for a dual primary 120/240 V transformer with either a single 16-18 V secondary winding, or two independent secondary windings each 16-18 volts, around 300 VA total.

Thanks.
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Old 22nd December 2004, 10:16 PM   #2
Stocker is offline Stocker  United States
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Why not buy one new from an online retailer?
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Old 22nd December 2004, 10:30 PM   #3
al2002 is offline al2002  India
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"Why not buy one new from an online retailer?"

Price, essentially. I'm looking for a surplus or used unit.
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Old 23rd December 2004, 12:47 AM   #4
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i have one here is the pictures.
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File Type: jpg ballast1.jpg (22.0 KB, 183 views)
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Old 23rd December 2004, 12:48 AM   #5
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another pic
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File Type: jpg ballast2.jpg (24.4 KB, 160 views)
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Old 23rd December 2004, 01:03 AM   #6
Stocker is offline Stocker  United States
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ah, does the 24V 150W printed on the side indicate the actual output of the transformer?
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Old 23rd December 2004, 01:08 AM   #7
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i think so. it same from a slide projector. and the guy i talked to on the forums said it was a transformer
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Old 23rd December 2004, 04:00 AM   #8
al2002 is offline al2002  India
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Quote:
Originally posted by part2wanksta
another pic

Thanks but that is 24 volts, for a halogen lamp, I believe.

I need 16-18 volts.
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Old 29th December 2004, 03:32 PM   #9
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Default transformer

I have a tektronics scope filament transformer that will fill the bill.
clean condition, but it is heavy!
Has as best I remember, 4 windings, 9.62 V connected W/12 ga wire, good for perhaps 15 a each. also six to ten other windings at the same voltages, but designed for lower amps. Tek used these higher voltages because they regulated all filaments down to 6.3V
The 9.62 will sag a bit under loads greater than 5a, which should put it within range.
If this is to be for class A amps like the"x" I suggest every extra volt will be of great use: I have not been able to achieve an AC to DC conversion at high amps for more than about a 0.99 voltage conversion factor. Its high mass will protect you from overheating issues, IMHO
Do tell me what DC you are aiming at- and how many efficiency rectifiers you're thinking about!
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Old 30th December 2004, 12:36 PM   #10
al2002 is offline al2002  India
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Thanks, but 19 V+ will be too high. In this application lower is better.

I need it for a digital control system, not an audio power amp.
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