Colorsound Phazex

This is a great sounding phaser so I thought I'd still do it even though it probably doesn't fit with my philosophy of when I would and wouldn't use vero.  Similar in some ways to the Phase 90 but I haven't seen a layout for this one and so decided it would be a good addition.  Like the Phase 90 this is going to work best with 4 matched JFETs and so it may be worth buying 4 matched rather than buying in a greater quantity and having to mess around.   The internal trimmer sets the bias point and so tweak that until you get the sound you want.  The original also had the Depth control as an internal trimmer but I thought it made much more sense to have that control external to make it a bit more versatile.

If you mount this one sideways it should fit in a 125B but a 1590BB may be the order of the day if you don't want to have to squeeze everything in. Thanks to Analogguru for the schematic.




Image from effectsdatabase:

And a revised layout making better use of the space so it could fit more easily in a 1590B, and based on 2N5457 JFETs for their availability.

Bill of Materials:

Group	Value	Qty
Resistors	6K8	2
Resistors	10K	10
Resistors	22K	4
Resistors	47K	3
Resistors	100K	1
Resistors	150K	3
Resistors	470K	2
Resistors	680K	1
Capacitors	180p	1
Capacitors	10n	2
Capacitors	47n	6
Capacitors	2u2	1
Capacitors	10u	1
Capacitors	33u	1
Diodes	1N5817	1
Diodes	4V7 Zener	1
IC	LM1458	3
JFET	BF244A or 2N5457	4
Trimmer	1M multi-turn	1
Pot	10KLog	1
Pot	470K Rev Log	1
Pot	1MLin	1