Boss SD-1 Mod
 Boss SD-1 Effect Pedal Mod
More Dynamics & Tone Mod
Electronic components needed: - 2 LED clipping diodes
- Jumper wire
This guitar effect pedal mod is simple and adds a tremendous amount to this basic Boss SD-1 Super Overdrive pedal.
I opted to keep the stock 4558DD JRC Op Amp chip, because the basic sound of all these chips and their replacements are manufactured to operate with roughly the same characteristics. You could remove the op amp from the circuit board and install an 8-pin chip socket. Then, with the chip socket in place, you could exepriment with the tone by swapping the chips out. Your call on your pedal. I opted not to do that, because I liked the tonal results of my Boss SD-1 pedal mod.
Personally, I believe there is WAY TOO MUCH HYPE around whether this op amp is sonically better than that one in any given application. While there may be a slight difference in overall tonal output, the difference will be missed when you are cranking it up - out in that great club you always play in! So, that's my reasoning...
Boss SD-1 Guitar Effect Mod
SD-1 Pedal Mod Steps: - In the clipping circuit, I replaced D4 and D6 with yellow LEDs. Why? Because I had them in stock! You see, it really doesn't matter what LED you use, because the clipping characteristics are relatively the same.
- I removed C6 - an unnecessary filter by all standards.
I removed D3 and R31 an unmarked resistor right next to it. This is a simple mod to the power circuit and cleans things up a bit
 You could jumper these out temporarily using a bare copper wire and see the difference in moments. To do that, simply wrap a short piece of wire around the leads of the diode (D3) and the resistor (R?) - it's not marked on the board). Use the picture and jumper the correct end of the leads. The other end of this pair is already jumpered together! Try it, and let me know how you'd describe the change!
These simple effect pedal mods brought some clarity and the element of picking dynamics. The harder I picked, the grittier the tone got. The lighter I picked, the cleaner the tone became!  I liked it! You may too! Give this effect pedal mod a shot for yourself. I think you'll find this guitar effect pedal, which is just OK in its stock condition, come to life in new ways. You might even keep the Boss SD-1 Mod in your effects pedal chain as your favorite overdrive pedal!
Find more at Guitar Effect Mods and How to Modify Guitar Effect Pedals!
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