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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. If you are more comfortable with online stores, it’s available at https://tonetoys.etsy.com and at https://www.tindie.com/stores/poetaster/

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.