Problems with Rod Elliot's Project 05 (power supply) - diyAudio
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Old 22nd April 2003, 08:37 AM   #1
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Default Problems with Rod Elliot's Project 05 (power supply)

I've almost finished building a preamp based on most of Rod Elliots projects. I am, however, having trouble with the power-supply.

I did some testing with a 5W, 22Ohm resistor in series with the AC (before the rectifier), and was able to measure the +/- 15V on the outputs.

When I remove this resistor, the fuse blows. I'm using 500mA, quick-blow fuses, and my powersupply is a 16V, 1.5A AC powerpack.

Any help would be much appreciated. My electronic knowledge isn't the best (I skipped most of my EE lectures ...), so please excuse me if this seems a silly question.
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Old 22nd April 2003, 08:52 AM   #2
trwh is offline trwh  United Kingdom
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Hi lordvader,

Try slow blow or antisurge fuses instead. Maybe the inrush current from the 1.5A plugpack is enough to rupture the 500mA quick blow types.

See ya,
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Old 22nd April 2003, 10:50 AM   #3
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Default PSU problems

Most probably you have a massive supply cap in the preamp, that acts like a short to the poor power pack at switch-on. Since this is only a problem at switch-on, Tims's advice will save you, but negates the protection of the power pack. A better solution is to use say 1 or 2 ohms from the powerpack to the preamp supply caps and see if the original fuse stays up.

Jan Didden
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Old 22nd April 2003, 12:41 PM   #4
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Thanks for all your replies. I'll give them as shot as soon as I get some new fuses!
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