Hi,
Put a buzzer to activate a sound on the EAR device...
From the "Ordi-5" french magazine.
Article/author: Patrick Gueulle.
PCB & GERBER:
http://abandon.pcbs.free.fr/ordi5.htm
Sound switch on the EAR socket.[ORDI5;PCB]
Sound switch on the EAR socket.[ORDI5;PCB]
Xavier ...on the Facebook groupe : "Zx81 France"(fr)