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Jürgen Haible Legacy Site

Functioning only when enabled by a sensor in the driver seat activated by the body weight of the occupant. The program directly reads files, created by Pulse and PatchMaster software (HEKA Elektronik Dr. Schulze GmbH) as well as ASCII files. However, the program may be useful in various applications when editing and measurements in a 2 -dimentional (for example time-current) wave are required.

This page is based an archived copy of Jürgen Haible's former homepage. It is provided for educational purposes, may be outdated and/or contain errors and will most likely not get updated.

The entire electronic heritage of Jürgen Haible (IP, copyright, designs, etc.) has been acquired by Random*Source.
All information is provided for non-commercial, educational use only - any commercial use (e.g. pcb production, manufacturing) is not permitted.
© 2015 Random*Source. All rights reserved.

JH. Krautrock Phaser
(a. k. a. 'Compact Clone' - insprired by the Schulte Compact A Phasing)

Red squirrel driver download for windows 10 32-bit.

Background

If you listen to German records from the 1970's, you often hear a rather unique phasing that comes from a device called 'Compact A Phaser' from the Berlin company 'Gert Schulte Audio Elektronik'. It's often referred to as 'Schulte Phaser', and I have heard it being called 'Krautrock Phaser', 'Schulze Phaser' (because it's prominent on many early KS albums), 'TD Phaser' (because of Tangerine Dream). In my opinion, this phaser has been important to the sound of these early electronic musicians almost as much as the synthesizers the used.

My Compact Clone from 1999

In 1999 I have built a clone of this on veroboard, and put it into the enclosure you can see in the pictures below.
This has been partially sponsored by the vintage synthesizer shop Touched by Sound back then, who also have taken my Phaser to NAMM to test the waters for commercial production. Well, it didn't come to this for various reasons, but I've been enjoying my Compact Clone ever since, and mostly use it on my Korg Lambda string ensemble.


Front panel view (click on image to enlarge)	With wooden cheeks (click on image for greater picture)

The new Compact Clone 2007

I've decided to do another redesign of that circuit and make a PCB layout.
All who have followed my DIY projects over the years know that I'm using the term 'clone' rather loosely.
I'm not actually 'cloning' anything, which would be a 1:1 reproduction of the original circuit and/or the appearance.
I certainly do strive for a most perfect reproduction of the sound that made a vintage design famous, but I also add features of my own that I find usefull, and tayler the circuit to my own needs and standards.
In case of the Compact Clone this means:

Things I keep

The incandescent lamp / LDR combination that is responsible for the unique way of sweeping

Big incandescent lamp as sweep indicator on front panel

The circuit topology: 8 Stages of Phasing, 2 Stages of Feedback. Negative, lowpass-filtered feedback

The 741 opamps

The unique 'Osc. Period' potentiometer that has maximum LFO rate on ccw end. (optional)

Works with original 7V 100mA lamps.

The possibility to mount potentiometers direcly on board. (Alps RK11 vertical mount types or similar.)
Of course you can connect about every other potentiometer with wires, too.

Mains-Powered (optional). For +/-15V powered, see below.

Power supply for mains powering on the PCB, including secondary fuses, rectifiers, electrolytic caps, voltage regulators and heatsinks.

Things I change

It's possible to adapt the circuit to slightly different lamps and LDRs.

I've added a lot of coupling capacitors to keep offset voltages from the outputs

A Hard-Bypass with a relay that is controlled by an momentary switch. (Push: Turn on. Push again: Turn off.)
Several of these switches can be wired in parallel, i.e you can have on on the front panel, and another one connected via jack for remote control.

Circuit redesigned for easily available potentiometers: 50k lin and 50k log (47k is the same, actually.)
It's also possible to adapt it for slightly different pot values (feel free to ask), if your favorite form factor of potentiometer only comes in certain values.

You don't need that special 'staircase' enclosure when using pcb-mounted potentiometers. In my version, the pots are mounted on the solder side of the board. So the component side looks down inside the enclosure, not being in th eway of the front (or rather 'top') panel.

Complete redesign for +/-15V operation. Option for MOTM-style power connector on the PCB.

Large heatsinks and stronger Lamp Driver transistors.

Mains transformer and primary fuse not on PCB for safety reasons.

No DIN jack.
Switch for LFO / Manual sweep on front panel
1/4' TRS jacks for remote control of Sweep Rate and Modulation Depth.

Sound Samples
The first three sound samples are from my 2000 Album 'Dark November'. The arpeggiated notes from the OB-8 are treated with the Compact Clone. In the first sample, it's rather tame. At the beginning of the second sample, the unique resonance Phaser kicks in.
Second Loop 1 (1.172 MB)
Second Loop 2 (1.172 MB)
Second Loop 3 (1.172 MB)

Drivers Schulze Elektronik 2020

Drivers Schulze Elektronik En

Schematics

NEW: PDF document with schematics of on-board components (and some hints how to cennect off-board components, too.)

The PCB

Here's a preview of what the PCB will look like (preliminary version):
Click on the image for a larger view of the components.
NEW:Component overlay with reference designators instead of component values. (Very useful for debugging and modifications)
NEW: Component overlay with component values (as silkscreened on the board)
Bill of Materials

Here's a list of components that I've used: Krautrock Phaser BOM.
It only contains the components that are soldered to the board, no front panel components.
You'll want to have a nice 'retro' looking lamp holder on th efront panel, too.
The incandescent lamp for the front panel is the same type as the two for illuminating the LDRs.
In Europe, E10 sockets are probably more common than elsewhere in the world. You can choose whatever socket you want - it just has to fit the lamp you're using. You can also simply solder the lamps to the PCBs with short, stiff wires, if you don't find a socket that fits into the PCB.
The lamps I'm using are 7V / 100mA types - spec'ed the same as in the original Compact A Phasing. If you cannot get these, you can try with 6.3V lamps of