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Updated Internal speaker (markdown)

Erwin Ried 2020-08-05 19:23:02 +02:00
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Internal-speaker.md

@ -13,6 +13,9 @@ https://s.click.aliexpress.com/e/_dWBRFr2
Connect `SPK+` and `SPK-` to the speaker and use double sided tape to fix it to the PCB.
Tests of the speaker:
https://www.youtube.com/watch?v=XkaGV9muvbg
## Additional details
A speaker has two wires, `SPK+` and `SPK-`. While there is no sound, the speaker floats on a magnetic field in the middle of its range. When `SPK+` is high the speaker moves forward. When `SPK-` is high the speaker moves backwards. The distance forward and backwards depends entirely on the voltage level.