Since a bunch of you are working on older pedal circuits that used the 4558 dual op amp IC, I poked around a bit to see if we could replace that harder to find chip with something we already have on hand, at least for breadboarding and prototyping.
I found this thread by doing a google search for "4558 equivalent".
http://music-electronics-forum.com/t19942/
I thought this would be a good chance for us to get better and understanding and using spec sheets, so check these two out and let's talk about them next week in class:
TL072:
www.ti.com/lit/ds/symlink/tl071a.pdf
MC4558:
www.st.com/web/en/resource/technical/.../datasheet/CD00000478.pdf
and another, just for fun, RC4558:
www.ti.com/lit/ds/symlink/rc4558.pdf
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