Making car amplifier SMPS with tl494 + DC Protection - Page 53

metal · 9th September 2008, 09:10 PM

Yesterday I succeeded extracting an old ATX PSU transformer. I boiled a water can for 10 minutes, turned the heat off and put the transformer inside it for 10 minutes. The ferrite core 2 halves just went off the plastic. I have some questions:

What is the material used to seal the ferrite halves together ?
Should I wind the primary and secondary in opposite directions ?

2pist · 10th September 2008, 01:24 AM

I have used 2 part epoxy with good results. I wind both primary and secondary the same direction....

luka · 10th September 2008, 06:30 AM

Hi

what he said or tape, rubber band,...you name it, force doesnt need to be strong, but it would be great if mechanically strong

metal · 10th September 2008, 04:44 PM

But why boiled water was able to melt this glue, is it epoxy too that melts under such circumstances

luka · 11th September 2008, 03:03 PM

Quote:

Originally posted by metal
But why boiled water was able to melt this glue, is it epoxy too that melts under such circumstances

Only epoxy will melt, nothing else, don't know where you see any glue...

metal · 11th September 2008, 04:51 PM

remove 'glue' from 'But why boiled water was able to melt this glue'

thanks alot. coz me not know that epoxy is not called 'glue'

luka · 11th September 2008, 06:48 PM

Hi

Hey don't get me wrong it it glue, but super strong, say epoxy and everyone will know what you mean

metal · 11th September 2008, 09:53 PM

Now I will use your schematic for the car SMPS. What wire gauge did u use and how many wires did u twist together for the primary and secondary as well as # of turns to get 40V on each rail, I do care about ur primary winding as it's most important in this case, then secondary can be calculated.

Another thing on mind, can I use those diodes in the ATX power supply.

djQUAN · 12th September 2008, 03:46 AM

depends on your SMPS output voltage.

the diodes on the 5V supply are rated to about 30V or so and on the 12V are a little higher. you'd need around 100V for a 35V supply.

metal · 12th September 2008, 12:21 PM

Low voltage/High current. I must refer to the datasheets of the diodes I found as well. For example, BUZ11 is easy to find, what about diodes ?

10th September 2008, 06:30 AM	#523
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Hi what he said or tape, rubber band,...you name it, force doesnt need to be strong, but it would be great if mechanically strong __________________ home page @ http://www.classdaudio.tk/ @ 24/7 all year long I FEEL SLOVENIA

11th September 2008, 06:48 PM	#527
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Hi Hey don't get me wrong it it glue, but super strong, say epoxy and everyone will know what you mean __________________ home page @ http://www.classdaudio.tk/ @ 24/7 all year long I FEEL SLOVENIA

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9th September 2008, 09:10 PM	#521
metal AVR & PIC C Development plus Eagle CAD diyAudio Member Join Date: Jan 2004	Yesterday I succeeded extracting an old ATX PSU transformer. I boiled a water can for 10 minutes, turned the heat off and put the transformer inside it for 10 minutes. The ferrite core 2 halves just went off the plastic. I have some questions: What is the material used to seal the ferrite halves together ? Should I wind the primary and secondary in opposite directions ?

10th September 2008, 01:24 AM	#522
2pist diyAudio Member Join Date: Jun 2004 Location: Utah	I have used 2 part epoxy with good results. I wind both primary and secondary the same direction....

10th September 2008, 04:44 PM	#524
metal AVR & PIC C Development plus Eagle CAD diyAudio Member Join Date: Jan 2004	But why boiled water was able to melt this glue, is it epoxy too that melts under such circumstances

11th September 2008, 04:51 PM	#526
metal AVR & PIC C Development plus Eagle CAD diyAudio Member Join Date: Jan 2004	remove 'glue' from 'But why boiled water was able to melt this glue' thanks alot. coz me not know that epoxy is not called 'glue'

11th September 2008, 09:53 PM	#528
metal AVR & PIC C Development plus Eagle CAD diyAudio Member Join Date: Jan 2004	Now I will use your schematic for the car SMPS. What wire gauge did u use and how many wires did u twist together for the primary and secondary as well as # of turns to get 40V on each rail, I do care about ur primary winding as it's most important in this case, then secondary can be calculated. Another thing on mind, can I use those diodes in the ATX power supply.

12th September 2008, 03:46 AM	#529
djQUAN diyAudio Member Join Date: May 2004 Location: manila	depends on your SMPS output voltage. the diodes on the 5V supply are rated to about 30V or so and on the 12V are a little higher. you'd need around 100V for a 35V supply.

12th September 2008, 12:21 PM	#530
metal AVR & PIC C Development plus Eagle CAD diyAudio Member Join Date: Jan 2004	Low voltage/High current. I must refer to the datasheets of the diodes I found as well. For example, BUZ11 is easy to find, what about diodes ?