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Power Transformer specs

McIntosh MC 240 power amp power transformer remake. What are the voltage taps on the secondaries?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: no power at all

Do you have the part number for the PCB?
Steve

Posted on Mar 23, 2009

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j2easy
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SOURCE: Pioneer SX-203 power transformer ATS1526 secondary voltage???

just a question.1st.. if you don't know what you should have... then what are you going to do... if it's lower or higher ... seems like you should have a print before you go looking...go check at the off and on switch for the standby .. 9v more or less to trip the relay to turn the sys. on... now get a print...or go backwards to the transformer to see if it's blown. or something in between is open

Posted on Dec 11, 2009

  • 506 Answers

SOURCE: will not power up

There should be a fuse between the switch and the primary. Have you verified that there is voltage on the primary or checked the continuity of the mains fuse?

Posted on Feb 09, 2010

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I have a new heater with diferant terminals from the old one so not sure how to atach the wires


There is no need to rewire the internal of the heater!
Just bring in the electrical supply to the heater, it can be either 120 or 240 volts.
If the heater you have is like the picture associated with your post, then all then have to do is change the supplied plug from 240 to 120. It comes pre set for 240. That plug is inside the cabinet.

If any other brand, then you need to change the wires at the transformer of the heater. All heaters need to be supplied with primary voltage: 120 or 240. Then the control system is supplied with secondary voltage out of the transformer. The secondary voltage is no more than 28 volts. and these wires are normally colored as blue or yellow.

Secondary power is already wired within the heater. NO need to change where they are. You will only need to deal with the Primary wiring.

There are many varieties of transformers that transform high primary voltage to a low secondary voltage of 28 volts. and these transformers have many wires: primary & secondary.
I will try to make this easy to understand.

If you have a Gas Heater Transformer with these colors:
  • Red
  • Black
  • White
  • Green
Or...
  • Red
  • White with Red Stripe
  • Black
  • White with Black Stripe
  • Green
These are Dual Voltage Transformers, you can bring in either 120 Volts or 240 Volts

If you bring in only 120 Volts...
1st example:
The Red wire will not be used! Hot wire to the Black, and the Neutral/Common, to the white wire. Green to ground.

2nd example:
Connect the Red wire with the White with Red Stripe together and connect these to the incoming Neutral/Common wire, normally White.
Connect the Black Wire with the White with Black Stripe to your incoming Hot Wire, which is normally Black.
Green to ground

If you bring in 240 Volts...
1st example.
1 Hot wire to the Red, the Other Hot wire to the Black, and White wire is not used. Green to ground

2nd Example:
Wire nut the two Striped wires together. then one incoming Hot wire to the Black, the other incoming Hot wire to Red.
Green to ground

Or This is only a Low voltage - 120 Volts Only
  • Black
  • White
  • Green
Or either any of these combinations...
  • 2 Blacks w/Green
  • 2 Reds w/Green
  • 1 Black, 1 Red w/green
This type will only be a high voltage, 240 volts only
Picture below is what a transformer looks like and it is where your incoming supply wires go. The smaller leads with the spade connections will go to a specific location & is the 'Secondary" .

Good Luck



25568369-di2jpn2pb5nzkrgf0hzbmyq5-3-0.jpg

Mar 14, 2015 | Pool & Spa

1 Answer

Conventional power pack


A primary and secondary usually refers to a transformer. The primary side being the input side 110 AC Volt or 220 Volt AC side. Also called Source.
The Secondary being the "output to load" side 12 Volts "for example". And also called Tap (Secondary Tap)

The voltage is changed by conduction, magnetic flux, neither side touching one another. And the number of turns of wire, per side, determine the voltage. The voltage may either be a step-down or Step-up depending on its use.
An unconventional method is to have both the primary & secondary combined into a single tapped winding - which arrangement is called an autotransformer. The autotransformer does not provide isolation between primary and secondary circuits but its simplicity makes it economical and space-saving.
Imagine a single wire wrapped from the top to the bottom being the primary, and tapping in. in the middle and bottom for the secondary, so the output becomes 1/2. That would be a step-down transformer.

The actual measurement of a transformer is measured by its efficiency (Faraday Law) which is defined as a ratio of power. I hope that's sufficient, but if you want more I would buy for $2 bucks an Electricity Made Simple Book, because there are pages after pages to write about transformers, and to understand electricity in general it is helpful to understand the difference between alternating current and direct current and its magnetic field of induction and magnitude of emf.

May 10, 2014 | Cars & Trucks

1 Answer

Schematic malibu 8100-9120-01


http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

I don't think they post schematic for the transformer
But generally, the primary coil receives 120Volt AC input from household electrical outlet
And the secondary coil produces 12Volt AC output for the low voltage lights.
The 'coil' is a coil of insulated wire wrapped around a metal core. Two coils set side by side create a transformer... when primary is energized, the secondary responds to the magnetic field caused by primary core... resulting in a current that flows on the secondary coil.
Output voltage on secondary coil is determined by the number of wraps and diameter of wire.

Some transformers offer a choice of secondary output... Kichler for example... you can select 12-13-14-15 Volt AC output
This is achieved by the way the secondary coil is wrapped.... for less voltage a wire is tapped at one point on the coil... for more voltage, a wire is tapped at another point on coil. This gives the user several wire choices to connect the lights.

Gene

May 09, 2014 | Intermatic Malibu 300W Power Pack...

1 Answer

My lexicon mc 12 pre amp won't power on. The lead


There may be a secondary fuse inside the unit, if not the problem will be in the power transformer, if you are handy with a digital post back and I will give instructions on testing the transformer.

Jun 09, 2012 | Audio Players & Recorders

1 Answer

1 phase , 50 Hz, 20 KVA , 2200/220 v , is connected as an auto transformer of step up type . Determine , a. The auto-transformer transformation ratio . b. Auto-transformer primary and secondary currents...


This is NOT a forum for college problem solutions. How would you have a 20 KVA transformer and an Atlas Sound AF140... these are different animals... Autotransformer is a more efficient connection when it is possible... the transformer will step the 220 up to 2200+220 volts ignoring the copper loss voltage. For proper designed transformers the primary and secondary copper losses should be close to equal... but in autotransformer connection the efficiency is improved as the added voltage of the supply going to the high voltage winding power does NOT suffer and add to the current required in the primary of this connection. The purpose of this problem is for you to discover that the efficiency of autoformer connection is higher than of a simple step up connection. Now with this carefully work the problem... The ratio I have all but given you... It is unclear what is considered full load here so I would base it on regular connection at 20 KVA at 2200 volts to calculate what the currents would be primary and secondary.in normal connection... calculate resistance of primary and secondary ASSUMING equal losses primary and secondary. What isn't clear is if the loss figures are for the autoformer connection OR just the specs for normal connection. The power factor kink adds to the misery. Approach this problem by making an equivalent circuit of the transformer showing the primary and secondary resistances... again the question is are the loss figures the specs of the transformer or the actual running values for the system....

Sep 11, 2011 | Atlas Sound AF140 140 Watt Autotransformer

1 Answer

My transformer is burned.Now I need to know what the secundairy voltages are


Transformers USUALLY don't get burned as they are usually protected by a fuse. This one supposedly uses a 3 amp fuse which should have protected it from getting burned. If you can find a schematic or if you can find the specs on the output amp power supplies we can probably calculate the voltage of secondary. We know only that it is supposedly 120 Watts and uses an 8 ohm speaker. The RMS voltage should be about square-root 120*8 = sqrt 960 = 31V*1.4 = approx 44 volts peak... so you will need to get about +/-45 volts out of the supply for headroom... which will need approximately 34 volts AC given diode drop and droop of filter caps. These are really rough educated calculations from the tiny bit of info we have.
Finding a transformer to replace this matching these requirements will be near impossible without getting device from the original manufacturer OR having your rewound.
I would first verify the transformer is bad (only plausible cause is somebody over-fused it or a winding shorted)... Remove all the secondary loads. Put a 3 amp fuse in AND put a 60 Watt light bulb in series with teh power cord to act as a limiting device to test the transformer... Note that transformers DO have a bit of odor as they are usually impregnated with a varnish...

Jan 11, 2011 | Hartke Kickback 12 Bass Amp Warehouse...

1 Answer

I live in New Zealand which has 240 volt supply on the grid. The zantrex 2000 works with an input supply of 120 volts. How can I use it?


Hi, OK, there are two ways to achieve this. One. Using an external STEP DOWN Transformer, 240 V AC, to 120 V AC. The ONLY thing that matters is KVA. As long as the KVA is the same ir will work. This means as long as the Output Voltage and Current are the same, it's irrelevant whats on the Secondary. So if
The second, is to remove the existing transformer, and substitute with an exactly the same Secondary Outputs, BUT with a 240 V AC,. Input winding. Most likely it is a simple step Down transformer anyway, that steps down, whatever the external voltage is, down to say 12 -18 V AC. Therefor ANY suitable 240 V AC transformer with the SAME secondary winding(s) will work, no problems. You can even get some transformers Overwound, for 240 V AC, a very common thing, depending on transformer construction. There are a few transformer manufacturers in the "Yellow Pages" contact one of them and inquire.
As a tip, sometimes the existing transformer has TWO 120 V windings, and sometimes only ONE side is used, for US power, and for 240 V AC, you simply connect the other winding in series, and NOW you have got your 240 V AC to whatever.

Sep 01, 2010 | Inverter Xantrex MS2000 Sine Wave Charger...

1 Answer

What is the secondary voltage of power transformer


The schematics do not show the actual voltage.

From the design, the phantom power secpndary should be around 35 to 45 volts AC.

The 16 volt supplies would require a secondary winding that will be around 26 to 32 volts center tapped.

Transformers are quite reliable and unless a voltage is missing, the transformer is likely OK.

The most suspect items are the electrolytic filter caps if the voltage is not the design 16 plus and minus values.

Jun 16, 2010 | Mackie 1202vlz3 12 Channel Mixer

1 Answer

What are the secondary voltages off the transformer supposed to be?


The secondary voltages of a transformer are stepped down voltages. For example a transformer might be stepping 120 volts AC down to 25 volts AC in the secondary. Which then would be rectified by a bridge rectifier in the power supply and converted to DC Voltage which would be used to bias transistors or tubes and other electronic components. The amount of voltage that is output for use is determined and calculated by the engineers designing the amplifier or pre-amp.

Aug 26, 2009 | Audio Players & Recorders

1 Answer

Whirlpool MH6151XHT-1 - No Power - Stumped


First change all the fuse and check whether it works or not, if it does not work than as per your finding the secondary transformer could be the issue, the secondary transformer tap down the voltage fro 230-240/110 to required control board voltage. the best thing if the unit is opened then the right problem can be found but as per your description either fuses are faulty or the secondary transformer.

Dec 12, 2007 | Whirlpool MH1150XMQ Microwave Oven

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