Maybe this could be adapted also to our Zeddies?
http://randomflux.info/1bit/viewtopic.php?id=100
The digital output port pins of AY maybe could be used for a beeper ...
Siggi
AY + Beeper?
AY + Beeper?
My ZX81 web-server: online since 2007, running since dec. 2020 using ZeddyNet hardware
http://zx81.ddns.net/ZxTeaM
http://zx81.ddns.net/ZxTeaM
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Re: AY + Beeper?
With some easily available parts, the digital output port pins of an AY chip can be used to make a simple resistive 8 bit DAC 
Mark
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.