Originally posted by pmazz850
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Now I am getting some help with the circuit and so far all the LM741's you can safely substitute with a LM1558 (or a 1458), which is a dual op amp for the 741. They have slightly better specs. A LM324 is a quad op amp (4 in a package). Plus I found this darlington transistor: http://www.st.com/stonline/books/pdf/docs/4132.pdf http://www.onsemi.com/pub_link/Collateral/TIP140-D.PDF not sure if we can use it yet, but I am trying to learn as I go along.
Hope that helped some,
h2opower.
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