For no apparent reason, here is a photo of my breadboard rig for playing with pedal circuits:
I was going to use an actual wooden breadboard, but they ain't cheap (well, OK, they are but I can get a lot of components for $8) so I used a ratty lump of wood I had previously been using as support for drilling holes in things. The bracket has been drilled to accept jacks, pots, and switches as needed.
The ratty wood is sort of appropriate, as this is a ProCo Rat I am building to experiment with while I relearn some basic analog electronics. Power stage is top-left, signal input and initial filtering top-right, gain stage is bottom-right, into the middle clipping diodes, then tone filter (called "filter" and wired backwards on the Rat) at the front to the left of clipping diodes. I haven't added the JFET output buffer and volume control yet, but the circuit is playable taking the output of the tone circuit direct to the output jack.
It's also the wrong op amp. I only have 4558s, everything else seems permanently stuck in the post right now. From what I have read, this could make my rat a little harsher as the original op amp tends not to amplify the higher harmonics as much. I don't have anything to compare with though, and it sounds ratty to me.
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