-15dB attenuator on fuzz for active basses

[deeno]

Hi guys,
I searched but did not find anything, I would try to put an attenuator on the input of a fuzz for active basses, perhaps with a ToggleSwitch that allows me to exclude it using passive basses.
Bass amps style for instance.
can someone help me with a schematic really easy to make?
thanks in advance!

[Gus]

Depends on the fuzz circuit.
Can be as simple as one series resistor input
or two resistors

[deeno]

Gus, the fuzz I'm talking about already has a 33k resistor in series with the input and after a 220n capacitor .. what do you think?

[Gus]

schematic or link?

[deeno]

it's the Colorsound Bass fuzz, this is the schematic:

I found this attenuator on the web, do you think it will work?

thanks gus!

[deeno]

I wonder if there is an attenuator that can be used indiscriminately on each pedal or should be calibrated for each .. like the pad button of a mixer to be clear

[PRR]

> this is the schematic

1) Change R1 to 150K, 100K, 500K, until happy.

2) Increase R5 to 1K, 2K, 5K, until happy.

Taking a wider view: Q1 is a booster. Instead of cutting-down then boosting back up, shouldn't we just take less boost?

Taking a close look: Q2's gain with R3 causes a low input impedance. Maybe under 10K. We would not do that for a clean guitar signal: it would suck-off the highs. We often do for a guitar fuzz-- the fuzz will give plenty of highs, fuzzed highs can be nasty, so we suck-down the highs before the fuzz. This is very much a matter of taste (good/bad your choice).

> found this attenuator on the web

It is 11K input. I think it will suck-off a lot of "tone". Lower volume and lower treble. As a general thing you could try going 10X on all values-- 100K against 10K. Then the instrument sees 100K, which is not too bad, and the following device sees 10K, which is plenty low.

But since you already have a booster, whacking-down the boost makes more sense.

Of course the transformer on the found-schemetic is for something else and not needed, probably not wanted, just to tame a hot bass.

[deeno]

thanks PRR!
yes, the part of the transformer is not within the mod and change the resistors is one thing I do now, I try both solutions!
you talk about guitar but in reality this fuzz is intended for an active bass, I was also considering the modification of "pre-gain" as is customary on Fuzz face but I prefer a ToggleSwitch moving from active to passive.
I try and then I tell you!
thank you very much!