Shared projects

Jasper Noise clock mod

by mangros.

2 layer board of 0.79x0.75 inches (19.99x19.05 mm).
Shared on August 5th, 2017 14:42.

The Jasper’s digital noise circuit is clocked by the keyboard scanner clock. This is fast enough to produce a natural sounding white noise.

This PCB will fit in the IC34 (the CD4006) socket and allow an alternate clock signal to be connected to the digital noise. A suitable source would be Oscillator 2’s square wave output after R99. This will create a raspy 80s computer explosion texture for the noise that will scale along the keyboard. (The Jasper LFO doesn’t go fast enough to achieve the main effect here.)

Fitting an SPDT switch will allow selection between the original noise clock and the alternate clock signal.

Use double-sided turned pin headers to mount this board to the main Jasper PCB.

If keeping a socket on the Jasper PCB and using a socket for the 4006 on this PCB, space under the panel is very tight. The official BOM suggests 17mm spacers and depending on your IC sockets, the board may not fit underneath the panel.

I used 18mm spacers so everything fits tightly but remains removable.

Order board. Download. Permalink. Embed order link.

Copy this HTML into your page to embed a link to order this shared project

Jasper XOR

by mangros.

2 layer board of 1.14x0.73 inches (28.93x18.42 mm).
Shared on June 22nd, 2017 23:23.

Mod board for the Jasper synth adding two different XOR waveforms that sound like ring modulation.

XOR1 is Osc2 x LFO (most flexible with an LFO modded for higher rates)

XOR2 is Osc1 x Osc2

The outputs are placed on Osc2’s rotary switch (you’ll have to adjust the lock to allow two extra rotation positions)

(Following images are for a v1 Jasper. Pins may differ slightly in later revisions.)

(wire colours below don’t match the above diagram)

Order board. Download. Permalink. Embed order link.

Copy this HTML into your page to embed a link to order this shared project

MOTM power to Eurorack

by mangros.

2 layer board of 0.64x0.60 inches (16.21x15.24 mm).
Shared on January 15th, 2016 22:10.

For Euro modules that can run on 15V in a MOTM case

Order board. Download. Permalink. Embed order link.

Copy this HTML into your page to embed a link to order this shared project

78SD

by mangros.

2 layer board of 3.25x1.97 inches (82.55x50.04 mm).
Shared on December 30th, 2015 21:49.

Snare drum synth module. More info at https://www.muffwiggler.com/forum/viewtopic.php?t=150329

Order board. Download. Permalink. Embed order link.

Copy this HTML into your page to embed a link to order this shared project

Dual 16mm Alpha pot wiring board

by mangros.

2 layer board of 0.70x0.55 inches (17.78x13.97 mm).
Shared on September 2nd, 2015 15:36.

Order board. Download. Permalink. Embed order link.

Copy this HTML into your page to embed a link to order this shared project