Don't mean to hijack this but would a LM339 be a suitable chip to
create a 60hz sine-wave?

 

Don't mean to hijack this but would a LM339 be a suitable chip to
create a 60hz sine-wave?

No. LM339 is a quad comparator.

 

Wow I think I should read the top of the data sheet before asking questions
Don't know why but I was thinking it was a quad opamp.

The original circuit called for an LM348 and all I could find in my box was the 339 and only one 741.

So my next question is is there a better chip for a 60hz sine-wave?

 

We do try to keep questions in their own threads. This is the original one - http://forum.allaboutcircuits.com/showthread.php?t=36525

 

We do try to keep questions in their own threads. This is the original one - http://forum.allaboutcircuits.com/showthread.php?t=36525

Post #3 in this thread should have remained in the original thread. It makes no sense here.

 

We do try to keep questions in their own threads. This is the original one - http://forum.allaboutcircuits.com/showthread.php?t=36525

The original Bubba oscillator thread does not show up in any forum on my computer. The only way I can get to it is by clicking on the link above.

 

To Ron H: The post is back in the bubba oscillator thread. That thread is from April, so it's pretty far back.

 

Wow I think I should read the top of the data sheet before asking questions
Don't know why but I was thinking it was a quad opamp.

The original circuit called for an LM348 and all I could find in my box was the 339 and only one 741.

So my next question is is there a better chip for a 60hz sine-wave?

The ORIGINAL schematic in the TI publication called for a TLV2474 quad opamp.

TI's page for this device:
http://focus.ti.com/docs/prod/folders/print/tlv2474.html
Datasheet: http://www.ti.com/lit/gpn/tlv2474

Read this: http://focus.ti.com/lit/an/slyt164/slyt164.pdf
You will find the Bubba oscillator described on the last couple of pages.

Read through the entire document, and try hard to understand the math behind it. If you can understand the math, getting the output frequency you want is just a matter of plugging in your numbers to the formulas shown.

[eta]
I am attaching a model and LTSpice .sym file for the TLV247xA family of opamps. This covers the TLV2471A, TLV2472A, and TLV2474A. You will need to install the free LTSpice program from Linear Technology to use it. Google "LTSpice Download".

There are two files in the .zip archive:
TLV247xA.sub - goes in \Program Files\LTC\SwitcherCad\lib\sub
TLV247xA.sym - goes in \Program Files\LTC\SwitcherCad\lib\sym\Opamps

The next time you start LTSpice, you will see the TLV247xA available in the Opamps directory.

 

I thank you much, will be going over it soon .