Stupid op-amp queston

[mcwilson]

I have a quick question about op-amps. I forgot to order one with the rest of my stuff for my Great Cheddar. The design doesn't specify the op-amp though... since I am quite impatient can I just pick up an op-amp at Radio Shack? Will this be really crappy? Should I wait and order one from Small Bear? Which one?

Thanks

[toneman]

RS should be fine.
Just make SURE the pinouts match.
Not *just* the number of pins, but what's-tied-to-what data sheet.
"Regulars" are 8pin = TL072/82   14pin = TL074/84.
There are many others....
If still not sure, come back and check again when U have some actual RS#'s.
Don't forget the sockets!!!

[DuncanM]

Looking at the PDF, Great Cheddar uses single op-amps - so TLO71's are probably in order if you're using a GGG PCB or similar.
And get three of them just in case... They should be cheap and easily available.

If you're doing your own layout and are going to use a dual op-amp, then get a TLO72 (or two)...

[Unclerny]

OF course that's if your local RShack still sells these parts.  Mine sells 741s only.  Good luck.

UE

[mcwilson]

What is wrong with the 741s? They seem to have the same pinlayout as the GGG circuit board.

[oldrocker]

Yes I believe a 741 would work fine here.  The reasons the pinouts match is the Big Chedder uses a single opamp.  The TL072 is a duel opamp.  A duel should work if you just use half of it,  but watch your pin layout.

[mcwilson]

Do you guys recommend soldering them straight to the board, or should I definately use a socket?

[Unclerny]

What is wrong with the 741s? They seem to have the same pinlayout as the GGG circuit board.

Nothing's wrong with the 741, I use them in the LiveDriver.  I was mainly commenting on selection.

Do you guys recommend soldering them straight to the board, or should I definately use a socket?

Sockets rule.  This allows for chip swapping and you don't have to worry about over heat.

UE

[oldrocker]

Always socket your IC's and trannys.