boost pedal for active pickups

[bernardoaraujor]

I'm thinking about building a boost pedal. Nothing fancy, just a bypass and a simple booster circuit to add some gain to the signal.

The thing is I have active EMG 81/85 pickups.
I reckon they have low output impedance.

How much would that influence the design?
Do I need to get a specific circuit for the booster in order to match the impedance, or anything that works for passive pickups will work fine for active?

[PRR]

> match the impedance

No.

Kinda-the-point of Active pickups is so you don't have to fret impedance.

[PBE6]

I have the same pickups! Really only 2 things to note about them:

1. The output impedance is low, but that really only impacts fuzz pedals and other pedals that rely on an impedance mismatch to tame the treble. You shouldn't have any trouble with a clean boost.

2. The bridge pickup on my guitar is crazy loud. I've measured about 2V on some hard strums. If anything, you might want to include an attenuator (fixed or variable) on the input side just to make sure you don't accidentally overload any of the clean stages. Either that or set very modest upper limits on the gain for your boost to make sure you get a good usable range.


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