dumb OpAmp question...

[bigjonny]

I'm not an electronics whiz, so here goes a question to help me (and others, I hope) understand opamps a bit....

I want to use a TL072 for the OpAmp sections (U1,U2) in the Simple Square Wave Shaper Made Simpler (SSWSMS).  The TL072 has 8 pins; SSWSMS has only 6 that are used.  The two that are "left out" are the Vcc+ and Vcc- pins (pins 4 & 8, respectively).

Do the SSWSMS's OpAmp(s) get powered from Vr at the non-inverting input of U1 (pin 3)?

What do I do with pins Vcc+ & Vcc-?  Do I ground them both?

Thanks.

[niftydog]

those pins are generally omitted from diagrams for clarity. It is assumed that they are connected to the power rails. In this case it's 9VDC single supply with Vr connected to the (first) op amps non-inverting terminal to bias it to mid supply.

[bigjonny]

Thanks for the reply.

So, erm, "power rails"?  I'm not sure what that means.  Do I connect Vcc+ to 9VDC, and Vcc- to ground?  Thanks again!

[niftydog]

yup.    Sorry, shouldn't have used jargon!

[brett]

When a rail is connected to ground, is it a power supply rail?  Or is the +9V the power supply rail?
Kinda stupid, philosophical question, but it's Monday morning and I haven't drunk my coffee yet.

[Hal]

i would call it a "ground rail," but i guess it is a power rail too....