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Old 17th December 2010, 10:58 AM   #1
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Default Help required on Logitech Z-2300 toroidal transformer

Hi, i am a newbie in this forum, and require help on my Logitech Z-2300 2.1 multimedia speaker system. My Z-2300 toroidal transformer have died and i need a replacement. But i do not know the VA rating of this transformer.

I opened my Z-2300 subwoofer and clicked some pictures, which i am posting below:

Toroidal Transformer
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Z-2300 slow blow fuse rating
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Input voltage from the wall
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I was also able to gather the following information from the net:

Transformer Details
Manufacturer: Ten Pao International Ltd.
Model No: TOG433028F0
Input: AC 230V/50Hz
Output: AC 20.1V x 2
Diameter: 9.5 cm;
Height: 4.5 cm.
Amperage: Unknown

Also i want to change my capacitors from CapXon which are know for bulging & exploding. Which company capacitor should i use? Will a even higher farad value give an even better result?

Capacitors
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Old 18th December 2010, 05:48 PM   #2
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A quite accurate way to work out the VA rating of a toroidal transformer is to weigh it and compare it with the specification of a manufacturers range.

Based on the size - I would guess that this one is about 120VA.

Does it weigh about 1.3kg?
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Old 19th December 2010, 05:03 AM   #3
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Thanks John, i will try to dismantle the toroid & weigh it. I cannot find any details of their toroids in Ten Pao website. I am providing the specification of Z-2300 below. I don't know but in some forums i found out that the output power of a system can provide some insight about the VA of its toroid used.

Z-2300 Specifications

Total Continuous Power(RMS): 200W
System THD: Better than 0.05% before clipping
Total Peak Power(RMS): 400W
Power distribution: 120 W (Subwoofer) + 2 X 40 W (Satellites)
Subwoofer: 120 W @ 8 ohms @ 10% THD @ 100Hz
Subwoofer Size (inch): 8
Subwoofer Type: Long Throw with 6th order bass reflex
Satellites: 80 W (2 X 40 W) @ 8 ohms @ 10% THD @ 1kHz
Satellite Size (inch): 2.5
Satellite Type: Polished aluminum phase plug drivers
Frequency response: 35 Hz - 20 kHz
Signal to noise ratio(SNR): @ 1kHz > 100dB
Sound Pressure Level (SPL): 117db
Total weight : Near 18 Kg
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Old 19th December 2010, 01:10 PM   #4
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Default Another picture of the toroidal transformer

I have sent a request to the manufacturer Ten Pao in their en-query section asking for the VA rating, till now no answer.

However here is another picture of the toroid.

Click the image to open in full size.

Can anybody refer to a company that makes similar toroid, that i can fit into my Logitech Z-2300. Thanks in advance.
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Old 20th December 2010, 07:49 AM   #5
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There are many companies in India such as Delta, Miracle etc
which can supply you a 2x20V toroid. There are also a number
of smaller winding shops who do not have a web presence.
In a pinch, you could use a regular EI type transformer too.

-: MIRACLE :-
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Old 20th December 2010, 03:18 PM   #6
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Quote:
Originally Posted by quadtech View Post
There are many companies in India such as Delta, Miracle etc
which can supply you a 2x20V toroid. There are also a number
of smaller winding shops who do not have a web presence.
In a pinch, you could use a regular EI type transformer too.

-: MIRACLE :-
quadtech, though i know the toroid has 20.1V x 2 output, I do not know the amperage of the toroid. Do you think, considering the size that it is a 120VA?
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Old 20th December 2010, 06:05 PM   #7
Minion is offline Minion  Canada
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I had a Logitech 5.1 system that had 6 TDA7293 chips and the torriod in it was a 2x24v 520Va ...... a simular 2.1 system with 4 chips would probably need about 300Va .....


Cheers
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Old 21st December 2010, 05:22 AM   #8
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Default Z-2300 power chip amps

Quote:
Originally Posted by Minion View Post
I had a Logitech 5.1 system that had 6 TDA7293 chips and the torriod in it was a 2x24v 520Va ...... a simular 2.1 system with 4 chips would probably need about 300Va .....


Cheers
Well all I can find out is Z-2300 amplifier is

The amplifier uses:
i) Two STMicroelectronics Class-AB, 80W, TDA7295 amplifiers bridged together to provide a total of 2 X 80=160W for the subwoofer.[Assumed]

ii) Two STMicroelectronics Class-AB, 60W, TDA7296 amplifiers powering each of the satellites.

iii) A Japan Radio Corporationís JRC-4565 operational amplifier required for the headphones in the control pod.

iv) Filtering of the audio signal is done by two beefy SamXon/ CapXon 10,000 uF, 35V capacitors.

v) The amplifier board have two voltage regulators/ stabilizers a 78M18 and a 79M18, making positive and negative 18 volts respectively.

So, do you think since it powers 4 TDA chips, it is 300VA rather than 120VA considering its size?

I personally believe 120VA is to less a value to provide power to the above 4 TDA chips and also when yo consider 200W RMS of power.
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Old 21st December 2010, 05:46 PM   #9
Minion is offline Minion  Canada
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Location: Cowican Bay , vancouver island
Well , if the Amp chips are Class AB and the Sub is supposed to put out 160w then you are going to need at least 300Va for that , and if the satalites are 60w each you are going to need about 200Va .....

After a Bit of Research I found that the Z-2300 Sub is 120w and the satilites are 40w each so a total of 200w or about 400Va , I"m sure logitech used a smaller one as it seems to be standard for companies to use undersized transformers to cut costs which also shortens the life of the transformer .....
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Old 21st December 2010, 06:57 PM   #10
Cobra2 is offline Cobra2  Norway
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Measure, and get as big as you can fit/afford...
Do the speaker terminals at the same time ;-)

Arne K
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