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Finding/attaching components (trying to recreate a schematic)

Former Member

I'm trying to recreate a PCB layout from an electronics magazine (I don't have the etching/photo-sensitive gear for the magazine's PCB layout, so ordering an Eagle generated file online seems easier) but am having trouble locating some of the components in the Eagle library and connecting them. I'm sure there's a logic to how components are organized there which I just haven't understood yet.

Here's a copy of the original schematic followed by what I've done so far in Eagle.

imageimage

 

 

 

1) Regarding the two ICs (1458 and 741) I'm a little confused. First, will any "1458" do, such as the LM1458N? Likewise, will any 741 do? Those were the only ones I could find in Eagle (DIL package).

Second, it seems I should disregard the literal connection from the schematic when checking with the datasheets (the + and - are opposite), but what about the power pins for them? I assume with the 741 I should attach pin 4 to GND and pin 7 to +Vcc but there aren't any power pins on the LM1458N. What gives?

 

2) Since there's no electrical connection in my Eagle schematic for now, how do I do that according the original schematic?

 

3) I'm having trouble finding the 1/4" mono output jack (PCB mount), the potmeters (not sure if the ones I found are correct) and how about those attachement pins (channels 1,2,4 etc/bypass/+12V/-12V etc.)?

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  • I've never used Eagle, but here are some possible answers to question 1:

     

    I think the LM1458 and LM741 are pretty standard.

     

    The OP amp + and - inputs are not interchangeable.  Hook them up exactly as shown in the the original schematic.  Eagle should have a mirror command to flip the component so it's oriented like the original schematic.

     

    The LM1458 and LM741 have V+ and V- pins that connect to the +12/-12 power inputs.  The connections are not shown on the original schematic.  I don't know what you need to do in Eagle to make sure they're connected in your circuit.

     

    If your article has PCB artwork, check it to see how the power connections are made.

     

    If your ICs are DIPs, I suggest wiring up the design using a solderless breadboard so that you're sure it works before you make a PC board.  You could also build it on a perfboard instead of making a PC board.

     

    JMO/YMMV

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  • I've never used Eagle, but here are some possible answers to question 1:

     

    I think the LM1458 and LM741 are pretty standard.

     

    The OP amp + and - inputs are not interchangeable.  Hook them up exactly as shown in the the original schematic.  Eagle should have a mirror command to flip the component so it's oriented like the original schematic.

     

    The LM1458 and LM741 have V+ and V- pins that connect to the +12/-12 power inputs.  The connections are not shown on the original schematic.  I don't know what you need to do in Eagle to make sure they're connected in your circuit.

     

    If your article has PCB artwork, check it to see how the power connections are made.

     

    If your ICs are DIPs, I suggest wiring up the design using a solderless breadboard so that you're sure it works before you make a PC board.  You could also build it on a perfboard instead of making a PC board.

     

    JMO/YMMV

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