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Testing the piezo speaker

 

I finally added the piezo speaker to the Z80MC. It only took me 2 years!
What I'd like to know is how is the speaker accessed?
I half expected there to be a beep or something when the system booted up but I didn't hear anything.
Is there a way I can test the speaker?
Short assembly or basic program maybe?
I looked in the monitor code but I couldn't find anything other than the "beep" LED.
Thanks for the help.

Mitch
 

Each key press creates a beep as well as turns on the led. If you don’t hear a beep, I would check to see if the opto coupler is installed?correctly.

On Sun, Apr 6, 2025 at 12:30?PM Mitch Smith via <kb3gkc=[email protected]> wrote:
I finally added the piezo speaker to the Z80MC. It only took me 2 years!
What I'd like to know is how is the speaker accessed?
I half expected there to be a beep or something when the system booted up but I didn't hear anything.
Is there a way I can test the speaker?
Short assembly or basic program maybe?
I looked in the monitor code but I couldn't find anything other than the "beep" LED.
Thanks for the help.

Mitch
 

Yes, it actually beeps on each key press. I just couldn't hear it.

Is there anything else I can do with it?

Mitch
 

I have the same problem. ?If I put my ear to it I can hear a faint beep. ?Checked all the wiring and connections, everything looks right.

Paul
On Apr 7, 2025 at 12:56?PM -0400, Mitch Smith via groups.io <kb3gkc@...>, wrote:

Yes, it actually beeps on each key press. I just couldn't hear it.

Is there anything else I can do with it?

Mitch
 

It is louder if the Piezo speaker is not in contact with the chips below, and suspended in the air with the ground wires.

On Mon, Apr 7, 2025 at 4:27?PM PRL via <prlaba=[email protected]> wrote:
I have the same problem.? If I put my ear to it I can hear a faint beep.? Checked all the wiring and connections, everything looks right.

Paul
On Apr 7, 2025 at 12:56?PM -0400, Mitch Smith via <kb3gkc=[email protected]>, wrote:
Yes, it actually beeps on each key press. I just couldn't hear it.

Is there anything else I can do with it?

Mitch
 

Thanks Kerem, I’ll give that a try.?

Paul
On Apr 7, 2025 at 8:10?PM -0400, Kerem Kapkin via groups.io <kkapkin@...>, wrote:
?

It is louder if the Piezo speaker is not in contact with the chips below, and suspended in the air with the ground wires.
<IMG_8573.jpeg>

On Mon, Apr 7, 2025 at 4:27?PM PRL via <prlaba=[email protected]> wrote:
?
I have the same problem.? If I put my ear to it I can hear a faint beep.? Checked all the wiring and connections, everything looks right.

Paul
On Apr 7, 2025 at 12:56?PM -0400, Mitch Smith via <kb3gkc=[email protected]>, wrote:
?
Yes, it actually beeps on each key press. I just couldn't hear it.

Is there anything else I can do with it?

Mitch





?
?
?
 

It can be activated through software, but I don't recall if the firmware made that available.?



On Monday, April 7, 2025 at 12:56:52 p.m. EDT, Mitch Smith via groups.io <kb3gkc@...> wrote:


Yes, it actually beeps on each key press. I just couldn't hear it.

Is there anything else I can do with it?

Mitch
 

Piezo speaker is somewhat inaccurate as its actually a resonator.
Being much louder at its resonant frequency.
?
They are best when well supported by their edges with airspace
under and over.
?
?
?
Allison
?

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