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Old 7th February 2008, 06:25 AM   #11
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Quote:
Originally posted by wirewiggler
Apex Jr has a Transformer
I fancy the TA110-W a lot more, and it's $3.95/pc
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Old 7th February 2008, 06:07 PM   #12
DaveM is offline DaveM  United States
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Yes but is that center tapped? It doesn't say so. I just read it as a single 48 volt output and not a +48,0,-48.

Am I wrong? If so, I think I will pick one up myself.
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Old 7th February 2008, 06:38 PM   #13
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Not center tapped, but 4 times $3.95 is less than $25.
-Plus they ensure perfect channel separation.
-Plus an EI/M core transformer is a preferable choice to use.
-Plus Mercury Magnetics is a pretty OK transformer manufacturer.
-Plus they likely have fully separated windings. By the looks of it, the pictured block type is the TA110-W, with the sizes given >50VA each.
-Plus you are free to use either the 48Vac or the 40Vac tap.
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Old 7th February 2008, 09:42 PM   #14
DaveM is offline DaveM  United States
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Good Point. I guess I forgot to think outside the box. Silly me.

You are absolutely right. I think these would be much better than a single torroid.
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Old 8th February 2008, 02:30 AM   #15
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Darn Jacco,
Decisions decisions, I was actually hoping to locate a pair of R-cores some where for variety.
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Old 8th February 2008, 05:41 AM   #16
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Don't let me stop you.
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Old 20th February 2008, 08:48 PM   #17
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Default TO 220 heatsinks

Darn,
Little heatsinks are to large will have look for some more. Found some R core transformers from Hong Kong price not to bad shipping was a bummer. Will show picture when they arrive.
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Old 23rd February 2008, 06:50 PM   #18
dviswa is offline dviswa  United States
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Quote:
Originally posted by wirewiggler
located heat sinks:
Futurlec has the little ones part # TO218S049B $.90 - http://www.futurlec.com/Heatsinks/TO218S049B.shtml and the Larger ones Surplus sales of Nebraska (HSK) HS-DMC501 $4.50 - http://www.surplussales.com/Heatsinks/HeatSink1.html . Will have to file the fins a little bit mabe 1/16, and they may overhang the sides a tad but close enough for me. Oh yea and Apex Jr has a Transformer 15-0042 92 VCT 250 VA (a little over kill ) $25.00 http://www.apexjr.com/miscellaneous.html#Transformers .

Bill


Darn,
Little heatsinks are to large will have look for some more.
Yup, I did the dumb mistake too.
I should have measured the size on the pcb before ordering. The larger heatsink needs filling of 3-4 mm or so. Not my favorite activity.

ZM,
Sorry to say, finding heatsinks are the bane of this project. There are components all around the heatsinks with no space available, making it very difficult to use other heatsinks. I still do not have any of the heatsinks needed.
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Old 23rd February 2008, 08:00 PM   #19
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Quote:
Originally posted by dviswa


Yup, I did the dumb mistake too.
I should have measured the size on the pcb before ordering. The larger heatsink needs filling of 3-4 mm or so. Not my favorite activity.

ZM,
Sorry to say, finding heatsinks are the bane of this project. There are components all around the heatsinks with no space available, making it very difficult to use other heatsinks. I still do not have any of the heatsinks needed.

I wrote more than once - just use plain sheet of 3mm Alu plate .

approximately 50% bigger than heatsinks in case , and it will be more than enough .

ya need fabric heatsinks to be in fashion ........ and real man use plain Al or Cu




I wrote that more than clear in Cook Book .
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Old 23rd February 2008, 09:00 PM   #20
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Default Hi ZM!

One Q, what kid of spices you used in your Cook Book?

Regards zeoN_Rider
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