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
