Surf pi 1.2 with VCO audio.

[dgm]

Good morning to all the members of this Forum, I wanted to ask if it was possible to have information on the connections, to change the audio to the surf PI 1.2 purchased from the silver dog, with a VCO circuit. I searched the forum but found nothing interesting. Thank you for those who can give me a hand or a more precise explanation.

[Floki]

dgm, look the schematic at hammerhead detector, IC9 NE555.

[bernte_one]

surf pi clicker

[waltr]

Also check my HH2 build thread for Mick's VCO circuit and my PIC12F1501 VCO code:

https://www.geotech1.com/forums/showthread.php?24251-My-take-on-the-HH2