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Old 4th October 2012, 08:50 AM   #111
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Tony is right, look at this page: Jan's transformer article p4
Has excellent advices to follow.

Here is a 4-digit counter that I have recently built, code, eagle files, attiny2313.

metal
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File Type: zip 4-Digit Counter.zip (186.5 KB, 34 views)

Last edited by metal; 4th October 2012 at 09:03 AM.
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Old 4th October 2012, 08:59 AM   #112
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this is what i use for mandrels:
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Old 4th October 2012, 09:04 AM   #113
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What winding machine do you use?
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Old 4th October 2012, 09:11 AM   #114
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china job:

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Old 4th October 2012, 11:29 AM   #115
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sorry for OT but :
google for slup122 and up to slup127
,they are pdf files. first hit.

TI website search engine is shite. could not find opa2134 ...
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Last edited by rikkitikkitavi; 4th October 2012 at 11:36 AM.
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Old 4th October 2012, 11:29 AM   #116
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can you give a closer photo for the transformer you are winding? I want to see how the windings look
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Old 4th October 2012, 11:42 AM   #117
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lots to see here: Tony's Transformer DIY pics
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Old 4th October 2012, 11:48 AM   #118
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If you don't have the core readily made, what material do you use to form it?
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Old 4th October 2012, 11:55 AM   #119
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plastic premade bobbins are easily available in Manila.....
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Old 4th October 2012, 02:11 PM   #120
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Thanks for quick reply from Tony & Metal
Very good suggestion & advice

Now I change my mind
I'm planning to make bigger trafo (about 600VA) but after look at
http://www.diyaudio.com/forums/power...-build-28.html
then more question appear in my head
I will make bobbin for this one but the form is rectangle not square as Tony suggest.
Please tell me what the disadvantages with rectangle shape?

I want trafo that not so high that can be fit in the shorter case

Rectangle because I will use :
1 1/4 inch (32mm) center tongue stacked 6.5 inch (16.5mm)
The thickness of the laminated plate is 0.5mm & I will go bellow 1T
The bobbin I will made with "fiber" PCB
Every 1 stack complete winding, brushed with clear insulating enamel
then I have a choice to use paper or plastic for insulating.
The paper is "brown wrapping paper" &
the plastic is that what use as "laminating paper" it is can stand up to 150C
& I guess its good to be used
but allmost Tony's trafo use paper insulator...
Again please tell me what to use here?

For finishing I'm not dip it into the insulating enamel because the winding is already insulated before & for the laminated plate just do with brush

So I'm on the right track or I must find bigger core size?
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Last edited by JOHN BALI; 4th October 2012 at 02:26 PM.
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