Thursday 1 September 2022

Encephalo Adjuster - NLC - Build notes - part 2

This is part 2 of the Encephalo Adjuster  build.
This is a 24 stage phase shifter. 
 
The most common commercial phase shifters (such as the MXR Phase 90, Univibe and Small Stone) have four stages.
The MXR Phase 45 is a 2-stage phaser
The MXR phase 100 has 6 stages.
The Mu-Tron Bi-Phase consists of two 6-stage phasers which can be cascaded into one
another for 12-stages of phase shift.  
Note that the MXR Phase 45/90/100 all use FETs, and the Small Stone uses
operational transconductance amplifiers.
 
The Encephalo Adjuster uses LDRs (light dependant resistors) to work its magic.
The Mutron Bi-phase also uses LDRs.

Nonlinear Circuits also has a few phasers you may like to try out:

Phasers work by creating notch filters & then modulating the centre frequency of these filters.

Links
Wiki
BOM

part 1 is here:
 



Soldering the headers.
These join up the 3 PCBs.
There are electrical connections via these headers between the PCBs so be careful not to short things .
 


I started off joining the bottom & middle PCB.
The bottom one has the jacks / pots etc.
 

The headers make a lightproof box.
 
 
So this actually is one big vactrol consisting of 24 LDRs and 3 LEDs

Then solder the headers that connect the middle PCB with the top PCB

 The top PCB has the blue white trimmer resistor.
 


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Time for the "vactrol"

Andrew writes:
"The 24 220k resistors can be left off if using GL5506 or GL5516
LDRs. The trimpot can be used to preset the phase shift. I suggest
leaving them off no matter what LDRs you use and then just use the
trimpot to get a good operating range from the Phase pot. If you
cannot get a good range, then add the 220k."


I only just read this  and already added these resistors.
I'll see how the module performs with them on and remove if I want to change things.
 

Im using GL 5516s

No Silicon Heaven?



LEDs

..using yellow
 

6 100K pots .. linear taper


Plug the 3 boards together

Finally done.




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You can find more NLC builds here.
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