LM358 vs 4558?

Discussion in 'General Electronics Chat' started by doug08, May 22, 2011.

  1. doug08

    Thread Starter Member

    Jan 30, 2011
    153
    2
    A circuit calls for lm358 low power dual operational amp, but I only have 4558. I built the circuit with the 4558's. Circuit does not work. I heard that the lm358 is a single sided IC, and the 4558 is not. I guess this explains why the circuit failed to work. It is definitely soldered correctly with all the other correct components. I have assembled/soldered enough circuits in my life. Can I do something to make the 4558's work for me? Make them single sided?

    Thanks
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The inputs of an LM358 work all the way down to the negative supply voltage which can be 0V and its minimum supply is only 3V. Its output goes down almost to the negative supply voltage which can be 0V.

    But the 4558 has inputs that might not work if they are within 3V of the negative supply voltage and its output might not go down to within 3V from the negative supply voltage. With a supply as low as 6V it barely does anything.

    Post your schematic and we will show you why it does not work.
     
  3. doug08

    Thread Starter Member

    Jan 30, 2011
    153
    2
    Here it is:

    Left side of circuit (voltage multiplier) works perfectly. pn4117a connected properly, all other grounds/voltage feeds test ok.

    Thanks
    [​IMG]
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,535
    The two chips have similar pinouts, but there the similarity ends. The 1558 is much older, and has much worse specs. They aren't interchangeable.

    Looks like yet another Geiger counter circuit. We've been seeing a lot of those.
     
  5. doug08

    Thread Starter Member

    Jan 30, 2011
    153
    2
    the chip I used is a 4558.
     
  6. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    An MC4558 or LM4558 is like a 1458 opamp (a dual 741) but has PNP input transistors and is about 2.5 times faster. It was intoduced by Raytheon in 1974.
     
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