+/- Power supply

Jye · 8th September 2004, 05:34 AM

hello,

I have a 24V DC 1A regulated power supply and when I have it hooked up to a bread board with 2 1k resistors in series between the inputs and the middle hooked up to earth I get +\- 12V. But when I connect the rails to the active filter they change to -7V and +14V

Has this happened to anyone before or does anyone have an idea on what maybe happening?

Cheers
Jye

Bill Fitzpatrick · 8th September 2004, 05:40 AM

Did you buy that power supply thinking you would have a good supply for the active filter? Where is the schematic of the filter for us to look at?

Jye · 8th September 2004, 07:12 AM

Hi Bill

No, I all ready had the power supply.

The active filter is just the 12 dB/oct Linkwitz-Riley crossover with the buffer stage.

Cheers
Jye

Tim__x · 8th September 2004, 07:21 AM

The problem is that your "ground" is a rather high impedance, buffer it with an opamp in unity gain, non-inverting mode.

8th September 2004, 05:34 AM	#1
Jye diyAudio Member Join Date: Aug 2003 Location: Brisbane, Australia	+/- Power supply hello, I have a 24V DC 1A regulated power supply and when I have it hooked up to a bread board with 2 1k resistors in series between the inputs and the middle hooked up to earth I get +\- 12V. But when I connect the rails to the active filter they change to -7V and +14V Has this happened to anyone before or does anyone have an idea on what maybe happening? Cheers Jye

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8th September 2004, 05:40 AM	#2
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	Did you buy that power supply thinking you would have a good supply for the active filter? Where is the schematic of the filter for us to look at?

8th September 2004, 07:12 AM	#3
Jye diyAudio Member Join Date: Aug 2003 Location: Brisbane, Australia	Hi Bill No, I all ready had the power supply. The active filter is just the 12 dB/oct Linkwitz-Riley crossover with the buffer stage. Cheers Jye

8th September 2004, 07:21 AM	#4
Tim__x diyAudio Member Join Date: Jun 2004 Location: Edmonton area, Alberta	The problem is that your "ground" is a rather high impedance, buffer it with an opamp in unity gain, non-inverting mode.

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