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Old 12th April 2010, 07:08 AM   #1431
adamus is offline adamus  United Kingdom
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hav you got any pics bob?
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Old 12th April 2010, 11:29 AM   #1432
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Quote:
Originally Posted by fredlock View Post
Hi CustomHT,

I have the same transformer as yours, R80-36. I haven't connected yet since I'm still waiting for parts that I ordered.

This is how I will connect it

You have 2 center tap 3.15V/3A per winding, Gray, Black Gray

You have 1 center tap 2.5V/3A per winding, Blue, Brown, Blue

To make it 8.15V for the heater filament, you only need the 2 Blue wires, ignore the Brown wire just insulate the end of it. That gives you 5Vac/3A. Then connect one of the blue wires, to whichever 3.15V center tap you want to use, to Gray wire and the black wire will be 0V reference. Measure it with the voltmeter and if you don't get 8.15V, you might want to reverse the connection of black and Gray, as what housing had mention earlier. It might be out of phase. You were also asking if you can parallel the 3.15V winding. I think you can but this will become 6A which I don't recommend.

In regards to the 260Vac, I think you can parallel the winding to achieve the maximum current rating, tie up Green and Green wire and orange will be your 0V reference.

Let's consult with the veterans here. Guys, correct me if I'm wrong. I'm just trying to help CustomHT. I know he asked this question like 3 times already and nobody had given him a detailed answer of the transformer connection.

Thanks,
Fred

Thanks for you advice..

I've managed to get the 9v input right now, but I'm thinking I may have something wrong on the 260Vac side (maby in the IV power supply?) as I've tried both green / orange and violet / orange which both show required voltages when not connected to the IV stage power supply. Once connected to the power supply the r-core trannie starts humming and the power supply is not outputing any voltage, so turned it off quickly..

Any suggestions?
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Old 12th April 2010, 02:08 PM   #1433
adamus is offline adamus  United Kingdom
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you cant parallel the 260, it is centre tapped, not dual secondaries. You are just shorting it. HOpefully the secondary survived, just connect one of the 260v and the CT as 0.
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Old 12th April 2010, 02:23 PM   #1434
housing is offline housing  Hong Kong
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CustomHT,

Did you read my posts, especially #1417?
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Old 12th April 2010, 02:36 PM   #1435
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Quote:
Originally Posted by housing View Post
CustomHT,

Did you read my posts, especially #1417?
Yes I did, but I didnt fully understand what you ment when you said "use 2 diodes as a full wave rectifier"
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Old 12th April 2010, 02:40 PM   #1436
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Quote:
Originally Posted by adamus View Post
you cant parallel the 260, it is centre tapped, not dual secondaries. You are just shorting it. HOpefully the secondary survived, just connect one of the 260v and the CT as 0.
I thought I had been using the CT? or am I getting confused?
The trannie is 260v (green) 230V (violet) 0v (Orange) 230V (violet) 260v (green).. I had been using the green and the orange wire for 260V?
Is this wrong?

Cheers in advance.
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Old 12th April 2010, 02:46 PM   #1437
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Location: Vienna
Simple question:

Can I use the DA103C transformer instead of the DA101C ?

DA103C Murata Power Solutions Transformers

The recommended one is not available.

This one from Silk will also work ?


Pulse Transformer for D/A convertor

the ratio is 1:1 what other features are important ?

Thanks,

Davide
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Old 12th April 2010, 02:50 PM   #1438
housing is offline housing  Hong Kong
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Quote:
Originally Posted by CustomHT View Post
Yes I did, but I didnt fully understand what you ment when you said "use 2 diodes as a full wave rectifier"
Back to the basics
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Old 12th April 2010, 02:59 PM   #1439
housing is offline housing  Hong Kong
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CustomHT,

I don't have the regulator board, I have the HV shunt supply PCBs only.

Don't populate the 4 HV rectifiers and the 4 snubber capacitors on your board. Instead solder the center tap to a plate-thru' via connected to the -ve pole of C5 (100uF/450V) and the rectified HV to a plate-thru' via connected to the +ve pole of C5.

In such case, you can use the full 200mA capacity of the transformer.

Last edited by housing; 12th April 2010 at 03:04 PM.
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Old 12th April 2010, 09:14 PM   #1440
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Quote:
Originally Posted by adamus View Post
hav you got any pics bob?
Hopefully these help. As you can see I'm still getting the 6V from the IV PS board. When I settle on final arrangement I'll put it all in a box.

Best
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