MXR MicroAmp - Treble Mod Poping

[duck_arse]

there is another way to wire the resistors that may work. put the 10M and the "18k - 100k" in series, from the C1//R3 point to +4V5. then wire the switch across the 10M, so when the switch is closed, the 10M is short, and gone from circuit, when the switch is open, the 10M is in circuit and will dominate.

have you had C3 connected to +4V5 at any time?

[LaloFP]

there is another way to wire the resistors that may work. put the 10M and the "18k - 100k" in series, from the C1//R3 point to +4V5. then wire the switch across the 10M, so when the switch is closed, the 10M is short, and gone from circuit, when the switch is open, the 10M is in circuit and will dominate.

The same happens

Maybe go for a really small C1 and a 2M2 for R2, to make te difference in impedance less of a factor.

Lower the 10meg to 1meg and just switch the input cap

With that I get a big Hum noise...

I also notice the input impedance of the circuit drops dramatically this way, a 18k resistor is a heavy load to drive for most (passive) guitars, and may cause a drop in overall level and high frequencies.

Thats true, I not only lose bass, I lose a bit of highs and overall level too. I dont dislike that sound, it focuses more on the mids.


So, it seems that there is no way to just cut bass without making a Pop and messing with the impedance and keep it simple, right?

When I cut the bass after the opamp I dont like the sound I get... is thin..

Maybe what I need is to find a proper EQ after the opamp. But I red somewhere that limmiting the band input of the opamp could give more rich sound because you give more "room" to the frecuencies you want and you get more rich boosted those frecuencies, like making more harmonic content of those...

What do you think about that? I really dont remember where I red that or if I understood it right

[dschwartz]

If you get hum with my recommendation is because you wired something wrong....for noise sake, 10M is way worse than 1M.

[LaloFP]

If you get hum with my recommendation is because you wired something wrong....for noise sake, 10M is way worse than 1M.

I just tested it again right now, and I got the Hum..
Without switches or anything, just replacing the 0.01 cap with a 3.3n one

With the gain in 1 is not a big deal, but when I raise it, the hum gets very loud

its a pity, because the sound is really nice (excepting the hum..)