Help on Liquid Drive

[fikri]

Hi

I need help to reduce more high frequency on the liquid drive project. I have use the 0,001 uF in the input signal, but i need more treble cut. can you suggest something ?

Thanks.

[MartyMart]

You can try a bigger cap across the op-amp, increase the 22pf to a 100pf
and see how you like it.
It sorted out my "squealing" and reduce the very "highs" a bit
Or try a larger "roll off cap" like a 4n7    0.0047uf

Marty.

[phillip]

Increase the value of the 0.003uF input capacitor...

The Liquid Drive doesn't have the pF capacitor across the 1M feedback resistor like in the Distortion + and OD250.  I found that using that capacitor with the Germanium clipping diodes tended to muddy up the signal.  But it does indeed reduce the high frequencies if you added a 22pF or 47pF capacitor in parallel with the 1M feedback resistor, especially if you use Silicon clipping diodes.

I would suggest Germanium diodes, though, since those are really what give the Liquid Drive its best sound.  1N270s were a touch brighter than the 1N34As when I had all the clipping diodes socketed, so I stuck with the 1N270s.

Phillip

[Mojah63]

Didn't you post the same question last week??   There are more ideas here:

http://www.diystompboxes.com/cnews/mods.html

[fikri]

Thanks for all the reply !  

I do really like the germanium. And the Burr Brown chip do help in maximizing the performance. And if i want to expand it a little bit by adding a tone control, what  will you suggest ?

And yes, i have post the same topic ! its my fault !  :oops:

[petemoore]

I think of a TC as 'narrowing'...
 The passives in a TC will draw some juice
 Study up on TC's and what do you want it to be/do.