Hi all
I have recently acquired Nelson Pass' M2 kit, and as such I have decided to build a proper power supply to compliment it.
A friend of mine gave me an MCI 4-05-5602 transformer. The only problem is that I cannot find its datasheet, let alone any evidence of its existence.
Here are some pictures of the actual transformer...
Imgur: The magic of the Internet
If anyone could help me find its datasheet or provide any info on it I would appreciate it a lot!
I have recently acquired Nelson Pass' M2 kit, and as such I have decided to build a proper power supply to compliment it.
A friend of mine gave me an MCI 4-05-5602 transformer. The only problem is that I cannot find its datasheet, let alone any evidence of its existence.
Here are some pictures of the actual transformer...
Imgur: The magic of the Internet
If anyone could help me find its datasheet or provide any info on it I would appreciate it a lot!
Easy peasy: you already know secondary voltage: 2 x 17V.
I need the section of that bobbin core, in mm, to estimate VA.
As in: "33 x 33 mm" or whatever you get.
It *looks* like a square section, but I will wait for your measurements.
I need the section of that bobbin core, in mm, to estimate VA.
As in: "33 x 33 mm" or whatever you get.
It *looks* like a square section, but I will wait for your measurements.
Heya. it's approx. 16.3 x 16.3 mm.
Not sure if you might need this, but the external dimensions of the core is 79.5 x 48 x 16.3 mm.
Not sure if you might need this, but the external dimensions of the core is 79.5 x 48 x 16.3 mm.
Probably my biggest concern is getting the input (220V in RSA) right.
You will see is has two primaries. I know some transformers have 2x 110V to make them more compatible with different regions, but the sticker says "PRI 220V". As far as I can tell, the primary windings should be 1-2 and 3-4 (they have thinner wire than the secondary windings).
Attached is a diagram of the windings and the dimensions found here
You will see is has two primaries. I know some transformers have 2x 110V to make them more compatible with different regions, but the sticker says "PRI 220V". As far as I can tell, the primary windings should be 1-2 and 3-4 (they have thinner wire than the secondary windings).
Attached is a diagram of the windings and the dimensions found here
Attachments
Thanks, all dimensions help, specially to minimize possible errors.
That is a SMALL transformer, only some 7VA so meager 200 mA current, MAYBE 250mA due to semi-toroidal build ... suitable for a pre-amplifier, not a power hungry Class A amp by any means.
Not sure what Mr Nelson Pass suggests, but I would guess a 2x25W Class A amplifier will AT least need a 120 to 150VA power transformer.
Given it´s a fine piece of Hi Fi equipment, would use even a larger one with no quibble.
PS: I had expected something around 33 x 33mm or larger, suitable for about 120VA, that´s why I suggested that value, capable of some 120VA
Don´t junk the small one, it´s perfect for a Preamp, it will give 24+24V DC raw, which can be down regulated to very clean +/-15V
EDIT: as of primary winding, join 2-3 , then connect 1 and 4 to 240V mains.
To play it safe, use a lamp bulb limiter, say a 240V 5-7W fridge or sewing machine lamp bulb in series.
A real red hot filament bulb, not a LED or CFL or any space age type.
If connection is fine, bulb will blink and then become dull red or orange, if wrong it will shine bright full power, in that case invert one* of the windings, say 1-2
It shouldn't happen, phase is clearly marked, but it never hurts being extra safe.
Just thinking about Alec Baldwin and similar cases 🙁
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Thanks for the info, I do appreciate it a ton!
As mentioned this is for Pass' H2 kit, which is a preamp. I believe this transformer would be perfect for that!
I only need 12V for the H2 kit, so this has more than enough power for my needs!
As mentioned this is for Pass' H2 kit, which is a preamp. I believe this transformer would be perfect for that!
I only need 12V for the H2 kit, so this has more than enough power for my needs!
Indeed 😉
I have done the bulb thing, and it worked, perfectly!
Very happy with this transformer now. Thanks for all the help.