GHOST EFFECTS: Warmjet V

This is the Ghost Effects take on the WEM Project V - the Warmjet V.  The name is a combination of the original WEM Project V, and the Brian Eno album, Here Comes the Warm Jets, which the pedal was allegedly used on and supposedly remains a favourite of Brian Eno (according to the internet, so it must be true).

It's basically a WEM Project V, with a few parts removed, which are arguably unnecessary.  The overly complicated tone/gain switches have been replaced with an Edge pot - probably not a bad idea.  

The vero below is a trace from the pcb and build documents published by Ghost Effects - who kindly also includes a list of potential mods in the build document.   Some models place all trimpots externally, which is a good idea if you have the space.  

GHOST EFFECTS WARMJET V - VERO LAYOUT

GHOST EFFECTS WARMJET V - POINT-TO-POINT LAYOUT

This is not an easy build - if you are not confident with point-to-point, stick with the vero layout.  So many transistors...   

I changed my mind and made the 50k trimmer an external pot.  I also moved some leads around to make it neater.  The layout is the same; I tucked leads under the board and resurfaced them elsewhere.  

CHANGES FROM THE WEM PROJECT V

First, load up the schematic.  

These parts have been removed

• 47n on the power supply/power filtering 
• The inductor between Q1 & Q2, which no one seems to know the value of anyway 
• 22pf, 390pf and the 100k resistor from base of Q7 to ground
• 50uf cap from collector of Q1 to ground
• the entire Edge / Drive switching system (replaced by Edge pot, which is a trimmed-down version of the filter system)

FREQUENCY RESPONSE OF EDGE CONTROL

The main difference between this and the switches on the Project V, is basically you get a good scoop with this one, and maybe a bit more bass is retained.

There are a lot of mods mentioned in the build doc linked above, so maybe have a read-through.  examples:

If you want to let a bit more square wave through, drop the 100k resistor going to Edge 3 to 10k - OR increase the volume pot to 5k.

Removing 10n in the filter section and replacing it with a jumper changes the Edge pot to a high-pass filter.  

SCHEMATIC