What ICs do Easyvibes call for?

[mcasey1]

The Easyvibe version with two 14-pin ICs, what are those Ics supposed to be?

[Seljer]

any quad opamp
a TL074/064/084 or a LM324 should be suitable candidates

[petemoore]

  IIRC the '64' is the low current model of quad LM series.
  IDRC exactly...something about the LFO drawing current and ticking, but, the low current OA's being recommended.

[mcasey1]

Thanks.   

[slacker]

I used TL074s for mine and I haven't had any problems with ticking, current consumption is a lot higher than John Hollis states for using TL064s though.
My build used one opamp for the phase shift stages and one for the LFO and input stage. I tried LM324s and they worked fine for the LFO/input stage but distorted horribly when used for the phase shift stages.

[boogietube]

Where is this layout?
I just etched the GEO board and I'm not that happy with the trace spacing.
Thanks!
Sean

[R.G.]

Trace spacing is binary: they touch, or they don't.

[boogietube]

I had to cut three joined traces on the board after I etched. They were in a " binary high state"   I'm afraid that I'll build "bridges of sighs" with my soldering iron. Anyone have a larger traced and wider spaced layout?
Please!

[mcasey1]

Im not knowledgable in design at all, but am I correct in assuming that one chip causes the LEDs to oscillate in a controlled manner, and one chip is used to amplify the signal that is picked up by the LDRs?  I see no transistors. Do the chips cause the phase sound to occur?