DEMO Aleph Null Otolith (Brat-ty Sunn thing)

This post contains an audio or video demo
DGWVI

DGWVI

Well-known member
Build Rating
5.00 star(s)
According to the designer this is supposed to be a sludge machine, sorta emulating a Rat into a Sunn but it's really just a generally great sounding dirt box. I'm not a sludge connoisseur, though 🤷🏻

Not a huge gain range, going from crunch to CRUNCH, but it's got some decent versatility to it. The Focus and Tone pots are, in my opinion, the stars of the show. They interact wonderfully, from a mellow warm fuzzy drive to an almost tinnitus inducing clang with a ton of textures in between the extremes. It doesn't ever get too dark or too bright for my tastes, and the ranges of each are well situated.
This won't replace a more standard Rat for me, but it is an awesome circuit and a lot of fun to mess with

@Aleph Null's Design notes


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Another great demo!

The gain range is kinda limited by the LM386. It has a jagged decay that doesn't sound good at lower gain and you can only hit the input so hard before it turns to mush. The Focus control effects pre-gain bass, but it also controls the gain of the first gain stage. With Gain turned down, you're mostly hearing the clipping diodes in the first stage. You could try diodes with a higher forward voltage for less clipping at the lowest Gain and Focus settings, but this will mean more signal hitting the LM386. You could also lower R3, but that will limit the upper range gain-wise of the Focus control. R6 forms a voltage divider with an internal 50k resistor, so you could increase this value if things get too mushy, or decrease it to hit the LM386 harder when Focus is turned up.

P.S. Cute kitties!
 
Aleph Null said:
Another great demo!

The gain range is kinda limited by the LM386. It has a jagged decay that doesn't sound good at lower gain and you can only hit the input so hard before it turns to mush. The Focus control effects pre-gain bass, but it also controls the gain of the first gain stage. With Gain turned down, you're mostly hearing the clipping diodes in the first stage. You could try diodes with a higher forward voltage for less clipping at the lowest Gain and Focus settings, but this will mean more signal hitting the LM386. You could also lower R3, but that will limit the upper range gain-wise of the Focus control. R6 forms a voltage divider with an internal 50k resistor, so you could increase this value if things get too mushy, or decrease it to hit the LM386 harder when Focus is turned up.

P.S. Cute kitties!
Click to expand...

I've already done a few of these to my (not-yet-boxed) modified take 🤘🏻
 
Reverted all the other mods on this second Otolith, and used some Rohm 1S2473 diodes measuring about 0.62 vf
 
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