Moatshark (lazrarcade)

Moatshark is a shark for the moat :) I made this thing to see what would happen :) Of course, I’ve always wanted to build something with the PT2399 digital delay chip in it.

Audio and video are below the functional overview.

Moatshark has a digital delay :)

I will build a limited (12) number of these. If you would like one (beware!) the cost is 134 Euro.

You can just pick up the sources and do it yourself from the fritzing files at Moat github … the moatshark folder contains gerbers.

A brief functional overview

A - Wave shape. Hard left really fuzzy broken triangle, middle almost sine shaped triangle, hard right, fuzzy triangle

B - This input switches between the A and B frequency modulation inputs of the XR2206 for lazrarcade, they behave quite differently

C - This switch controls whether the B frequency modulator runs in lazr (signal through capacitor) or clean (beep :)

D - This input (only the leftmost) is for amplitude modulation. Not much tested.

E/F - These inputs are to the frequency modulation parts a and b of the XR2206

G/H/I - These are divisions of the main frequency and so can be used to produce either melody on E and F or switch between a and b FM inputs (via B)

J - This controls the digital delay effect in the mix. Hard left, no delay, hard right only delay (or noise)

K - The frequency of the b fm input. If C is up, it’s low to high (left to right). If C is down (toward you) K is only a slice in the middle and goes high in both directions.

L - The frequency of the a fm input. It’s High to low, left to right, for some obscure reason.

M - Feedback on the delay … its a bit odd. play with it.

N - Length of the delay. Left shorter, right longer.