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8th December 2003, 09:51 PM
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#1 |
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diyAudio Member
Join Date: Feb 2003
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EI core transformer for step-up PSU
I want to make my amps work in my car. I understand how to make a high frequency oscillator. Could I take 2 115vac 25v transformers and use them to turn 12v into +/- 57v? I would use the secondaries as primaries and vice versa. I should expect increased performance and power handling at 30Khz right?
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8th December 2003, 11:21 PM
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#2 |
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diyAudio Moderator
Join Date: May 2003
Location: Palatiw, Pasig City
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you have to use a 60hz modified sine wave inverter or an inverter to convert 12vdc car battery voltage to 110 volts ac...
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http://www.elab.ph/forum/index.php?topic=32688.0 |
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8th December 2003, 11:45 PM
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#3 |
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diyAudio Member
Join Date: Jun 2003
Location: Woodlands Circle
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hmmmm...never tried it bfore...makes sense when u're running it at higher frequencies it would not saturate if it's designed for 60Hz....but skin effect??
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Kids in the back seat cause accidents...Accidents in the back seat cause kids... |
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8th December 2003, 11:48 PM
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#4 |
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Banned
Join Date: Nov 2002
Location: Adelaide, Australia
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mains transformers are designed for 50 or 60Hz... you really couldn't run them at anything higher than like 100Hz without running into problems.. you need to wind your own transformer, or find one ready made that is suitable for high frequencies..
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9th December 2003, 01:16 AM
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#5 |
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diyAudio Member
Join Date: Nov 2002
Location: sg
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why not get yourselves one of those computer powersupplies. strip the toridal and use the feedback to control the voltage.... i might be as simple as a 555 IC connected to a couple of mosfets into the transformer....
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9th December 2003, 11:41 AM
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#6 |
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diyAudio Member
Join Date: Jun 2003
Location: Woodlands Circle
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The 555 thingy cpould work...but u will have no fedback...meaning u have to set the voltage under the intended load...be careful with em...
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Kids in the back seat cause accidents...Accidents in the back seat cause kids... |
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9th December 2003, 04:19 PM
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#7 |
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diyAudio Member
Join Date: Feb 2003
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I really don't need feedback. My amp is happy with unregulated rails. I wanted some kind of pre-fab transformer because winding toroids is a PITA.
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9th December 2003, 04:29 PM
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#8 |
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diyAudio Member
Join Date: Jun 2003
Location: Woodlands Circle
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Grab a Toroid from a PSU and re-wind it...I dun think it's a really good idea to use a 50/60Hz Trafo for SMPSU work...
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Kids in the back seat cause accidents...Accidents in the back seat cause kids... |
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