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#1
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Re. 28v switcher psu
ok then MikeN i guess you were moding a psu, was it a computer psu and if so
what was your final voltage, asking as i would like to know how many secondary turns you wound for your required voltage, asumming running at about 33khz 230v ac before rectifier etc... oh MEK?? i have cellulose thinners to hand..but no transformer to split untill i get my hands on some more psu's, (when i venture back into the attic!) sorry if these questions sound simple, but i am really keen in not having to wind douzens of transformers before i get it correct.. All else has been done ie caps beefed up from 16v to 35v, feedback crt modded.etc......I will be writing up when finished and putting on web page in case of any interest.. simon |
#2
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ok i know what mek is now thanks..helps if i read previous posts first..
"zindazenda" wrote in message ... ok then MikeN i guess you were moding a psu, was it a computer psu and if so what was your final voltage, asking as i would like to know how many secondary turns you wound for your required voltage, asumming running at about 33khz 230v ac before rectifier etc... oh MEK?? i have cellulose thinners to hand..but no transformer to split untill i get my hands on some more psu's, (when i venture back into the attic!) sorry if these questions sound simple, but i am really keen in not having to wind douzens of transformers before i get it correct.. All else has been done ie caps beefed up from 16v to 35v, feedback crt modded.etc......I will be writing up when finished and putting on web page in case of any interest.. simon |
#3
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My analysis of the few switchers from PCs is that
the windings are about 4V/turn. This assumes one takes the center point of the mains caps as the primary voltage switched. 42 to 44 turns, I counted. The secondary seems to have plenty of lee-way in voltage range on the assumption that on full load only will it be a 50% duty cycle. I'm sure someone will correct me it I'm wrong! :-) Cheers zindazenda wrote: ok then MikeN i guess you were moding a psu, was it a computer psu and if so what was your final voltage, asking as i would like to know how many secondary turns you wound for your required voltage, asumming running at about 33khz 230v ac before rectifier etc... oh MEK?? i have cellulose thinners to hand..but no transformer to split untill i get my hands on some more psu's, (when i venture back into the attic!) sorry if these questions sound simple, but i am really keen in not having to wind douzens of transformers before i get it correct.. All else has been done ie caps beefed up from 16v to 35v, feedback crt modded.etc......I will be writing up when finished and putting on web page in case of any interest.. simon Murray Kelly vk4aok |
#4
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ok i know what mek is now thanks..helps if i read previous posts first..
"zindazenda" wrote in message ... ok then MikeN i guess you were moding a psu, was it a computer psu and if so what was your final voltage, asking as i would like to know how many secondary turns you wound for your required voltage, asumming running at about 33khz 230v ac before rectifier etc... oh MEK?? i have cellulose thinners to hand..but no transformer to split untill i get my hands on some more psu's, (when i venture back into the attic!) sorry if these questions sound simple, but i am really keen in not having to wind douzens of transformers before i get it correct.. All else has been done ie caps beefed up from 16v to 35v, feedback crt modded.etc......I will be writing up when finished and putting on web page in case of any interest.. simon |
#5
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My analysis of the few switchers from PCs is that
the windings are about 4V/turn. This assumes one takes the center point of the mains caps as the primary voltage switched. 42 to 44 turns, I counted. The secondary seems to have plenty of lee-way in voltage range on the assumption that on full load only will it be a 50% duty cycle. I'm sure someone will correct me it I'm wrong! :-) Cheers zindazenda wrote: ok then MikeN i guess you were moding a psu, was it a computer psu and if so what was your final voltage, asking as i would like to know how many secondary turns you wound for your required voltage, asumming running at about 33khz 230v ac before rectifier etc... oh MEK?? i have cellulose thinners to hand..but no transformer to split untill i get my hands on some more psu's, (when i venture back into the attic!) sorry if these questions sound simple, but i am really keen in not having to wind douzens of transformers before i get it correct.. All else has been done ie caps beefed up from 16v to 35v, feedback crt modded.etc......I will be writing up when finished and putting on web page in case of any interest.. simon Murray Kelly vk4aok |
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