[sdiy] Circuit / Op-amp question

[James Patchell]

I generally avoid the TL0x4 quads because the power pins are on the 
opposite sides of the chips compared with everything else, and I insist 
that pin one of all chips face the same direction, it at all 
possible.  Generally, I have found that the Duals really don't take up 
anymore real estate than the quads, so I stick with the duals and singles.

Take a look at the last VCO I did...

http://www.oldcrows.net/~patchell/synthmodules/100-1007.pdf

I do have IC's that are orthogonal to each other, but pin one is all the 
same direction.  And I don't think by going to quads I would have really 
saved anything.


At 12:34 PM 12/21/2004 -0800, Tim Parkhurst wrote:
>Okay, so here's one for the gurus:
>
>I'm laying out a circuit board for a VCO. Between the expo converter, the
>sync circuit and the waveshapers/buffers, there are several op-amps on the
>board. Are there any disadvantages to using quad amps (TL074 for example)?
>My main concern is if things like the sync buffer might have any funny
>interactions with the expo converter (if they share an dual or quad op amp
>package). I think it would be okay if the waveshapers shared a quad amp or
>two (there's one in the tri to sine, one buffer for the triangle, one buffer
>for the square wave, one or two for the tri to saw converter, two for the
>PWM, and one for the suboctave buffer, so two quad packages would fill the
>bill nicely).
>
>Or am I better off using duals (only slightly more board space)? Again, my
>main concern is interaction with the expo converter if I use a dual or a
>quad there and share the IC package with some other functions.
>
>As always, I await enlightenment...
>
>
>
>Tim (still waiting) Servo
>
>"Imagination is more important than knowledge." - Albert Einstein
>
>
>
>
>
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         -Jim
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