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Can someone convert this schematic to bradboard??? Answered

Hi everybody this is my first post. I am getting into electronics and I am no good at reading schematics. I was wondering if anyone could convert this schematic to an eagle eye breadboard view. Any help would be really appreciated. Thanks :)

LINK TO SCHEMATIC: http://img63.imageshack.us/img63/9819/djmixerappended.jpg


Yes laying out a PCB can be very challenging but its a good skill to learn. Fortunately the layout of that schematic is pretty straight forward and can pretty much be moved directly from the schematic to the PCB. There should be very little tweaking involved. So find the PCB layout application you want to learn and see what you can come up with.

you can find tutorials for these editors (eagle, geda, etc) here and on youtube.

I tried to work through the geda tutorial but the program crashed on me. I use Eagle. Someday I should bug DJ to help me out with geda. He works on the project.

Thanks for your comments and help. I was having some trouble with what the triangle with the positive and negative symbols mean. Is it a diode??. I'm not too sure.

This looks like a doozy of a stating project, I'm going to break this down as best as I'm able. The triangles with with the positive and negative symbols are called Op Amps, and they work as amplifiers and comparators. When you buy these they come with more than one op amp in a chip, so even though your schematic has 12 of them, you may only need two to six chips. You'll need to know what chips you are using before you breadboard.

Your circuit has two audio preamplifiers for your two different inputs, and these likely use two 386 op amps. I honestly don't know enough about these to tell you everything you need, but you can find more info here:

The bottom part of the circuit uses op amps as comparators. This is a very nice description of how those work:

Since this is one of your first project you should consider building this in sections. You could breadboard one preamplifier and get it working, then build another and test it. Then you could build the LED part and plug it into the known working amps you just made. I think that would make it much easier to manage and test.

The symbols in the schematic appear to be general purpose Op Amps to me. I feel the LM386 would be a poor choice even in the preamplifier roles you suggest using them in. The LM386 could be used as the output Speaker Amp. I do not think it would perform too well even there though.

One thing I do not see anyone here mentioning is that the Op Amps are drawn as dual supply components. The -5V below the triangles does not mean ground. -5V in this schematic is 5 volts below ground.

I've written an article here about a dual positive negative power supply:


This project uses a dual power supply and Op Amps as preamplifiers:


Both of those might help shed some light on the circuit in question. Perhaps even on missing parts of the circuit. Because to get it to work it looks like you're going to need a dual supply to me.