Power supply for TL072 and TL074
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 Chip Amps Amplifiers based on integrated circuits

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 8th September 2013, 03:57 PM #1 diyAudio Member   Join Date: Jul 2013 Location: Kiev Power supply for TL072 and TL074 Hi folks. I'm looking for help with tl072 and tl074. The question is what maximum voltage can be used to power it without a harm?
 8th September 2013, 04:26 PM #2 diyAudio Member   Join Date: Aug 2013 The absolute max rating is +-18v which is not advisable. The nominal supply voltage is +-15v.
 8th September 2013, 04:48 PM #3 diyAudio Member   Join Date: Jul 2013 Location: Kiev Thanks, sghr220. Could you please explain what does "+-" mean?
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Join Date: Aug 2013
+- means the positive and negative supplies of the op-amp, see the photo in the attachments.
Attached Images
 Tl072 opamp.JPG (30.6 KB, 100 views)

 8th September 2013, 11:11 PM #5 diyAudio Member   Join Date: Jul 2013 Location: Kiev Ok. So if the negative (pin 4) is connected to ground, does that mean that positive can take up to +30 V?
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Join Date: Aug 2013
Quote:
 Originally Posted by soul brother Ok. So if the negative (pin 4) is connected to ground, does that mean that positive can take up to +30 V?

The op-amp reference point is the negative terminal so as long as you keep the potential between pin "4" and pin "8" below or at 30v (taking polarity into consideration of course) you can power it with Vcc=1000v and -Vcc=1030v.

 9th September 2013, 10:17 AM #7 diyAudio Member   Join Date: Oct 2006 But the earth have to be at +15. So it is not really the ground. Or it can be also at 0? Last edited by mrWagner; 9th September 2013 at 10:37 AM.
 9th September 2013, 10:19 AM #8 diyAudio Member   Join Date: Jul 2013 Location: Kiev Thank you very much!
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Join Date: Sep 2004
Location: UK
Quote:
 Originally Posted by mrWagner But the earth have to be at +15. Or it can be also at 0?
There is no "earth" on an op-amp.

But I see what you mean - in a single rail application (V- = 0v, V+ = 30v) the input pins need to operate around 1/2 the supply, or +15v.

 9th September 2013, 11:13 AM #10 diyAudio Member     Join Date: Nov 2011 Location: UK SoulBrother, are you aware of what is meant by a split supply ?

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