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.
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
--------------------------------------------
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
+ LEDs
..using yellow
6 100K pots .. linear taper
Plug the 3 boards together
Finally done.
-----------------------------------------------------------------------------------
You can find more NLC builds here.
---------------------------------------------------------------------------------------
No comments:
Post a Comment