Note: Wilf's schema is NOT the complete schema of ZON X-81! It also contains an audio amplifier (amplifying the signal at the "sound" output) as well as a speaker.
Siggi
ZX81 and sound
Re: ZX81 and sound
My ZX81 web-server: online since 2007, running since dec. 2020 using ZeddyNet hardware
http://zx81.ddns.net/ZxTeaM
http://zx81.ddns.net/ZxTeaM