effect of unbalanced rails?

sparkaholic · 15th January 2005, 11:08 PM

I have an amp that runs on approx +/-28V rails for the output. The +/- 28V is zener regulated to +/-15V for the op amps, etc. The +/-15V rails are +16V and -19V. What effect could this have on the output?

anatech · 16th January 2005, 03:15 AM

Hi sparkaholic,
I'm guessing the -19V will affect the op amp more than the output offset. The voltage is so far off, I would replace the zener if I were you.
-Chris

Enzo · 17th January 2005, 04:00 AM

Yeah, I wouldn't sweat the offset so much, but that is 35V across the chip and I don't know what chip it is, but it may not like it. No room for movement. Zeners are cheap, replace it.

15th January 2005, 11:08 PM	#1
sparkaholic diyAudio Member Join Date: Jan 2005 Location: Cleveland,OH	effect of unbalanced rails? I have an amp that runs on approx +/-28V rails for the output. The +/- 28V is zener regulated to +/-15V for the op amps, etc. The +/-15V rails are +16V and -19V. What effect could this have on the output?

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16th January 2005, 03:15 AM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi sparkaholic, I'm guessing the -19V will affect the op amp more than the output offset. The voltage is so far off, I would replace the zener if I were you. -Chris

17th January 2005, 04:00 AM	#3
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Yeah, I wouldn't sweat the offset so much, but that is 35V across the chip and I don't know what chip it is, but it may not like it. No room for movement. Zeners are cheap, replace it.

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