[GlorytheWiz825]

Hi guys,

I have just finished soldering the op-amp to my board and was trying to hook up the +V and -V terminals when I got confused. According to Tangent's tutorial, the +V is located pin 8. However, according to my circuit book, pin 8 is not used and +V is located at pin 7. So where do I hook up my +V lead to, pin 7 or pin 8?

Thanks!

 

[kipman725]

Depends on the op amp your using but just look up its data sheet. I used this opamp in mine:

http://www.national.com/ds/LM/LM4562.pdf

(I think it's the recomended one)

also if you have a duel opamp on an 8pin package all of the eight pins are used.

 

[GlorytheWiz825]

Ah, thanks for the quick reply. I guess it does depend on the op-amp used. Thanks again!

 

[picklgreen]

GlorytheWiz825 what opamp are you using?

 

[Pars]

Most opamps with V+ on pin 7 are single, not dual, opamps. If you are buliding the original Chu Moy (as on Headwize) CMoy, then it does indeed use two single opamps (one per channel). Tangent's layout, and most others that I've seen, use a single dual opamp (OPA2132/2134, etc.).

Also, a single opamp will have different pin assignments for the inputs, out, etc.

 

[GlorytheWiz825]

Quote:

Originally Posted by picklgreen /img/forum/go_quote.gif GlorytheWiz825 what opamp are you using?

I did some quick reading and realized that I am using a dual op-amp (OPA2132PA). So looking at its datasheet, it's V+ pin would be at pin #8, not pin#7. Thanks guys!

 

[Ace o' Spades]

Yeah, you should be fine. I think OP2132PA is what Tangent uses in his tutorial.

 

[picklgreen]

Be sure to try a OPA2227PA also! MMMMMMMMMMMMMMarvolus!

 

[Ace o' Spades]

Yeah, there is a reason I use nothing else