In my case, what worked best: the longest one is shared between the pwm pin and the piezo, the shortest one goes to GND and the middle one goes to the other pin of the piezo. Hi, thanks! I noticed that the autotransformer has 3 different sizes pins. If anyone can find similar transformers on Mouser I'd be interested in seeing it. Also ozitronics posted some data (see picture) on his 'autotransformer' with similar resistance and 91mH/2.1mH inductance. Here is the transformer that I measured: Pin1-2 154ohm and Pin 2-3 8ohm Pins 1-3 is ~161ohm. The auto-transformer has three leads and you can measure the resistance across the leads to determine which is which. If anyone can explain the phyisics behind its operation, pleas chime in! thanks. Selection Guide according to Sound Pressure. The black blob is a pulsing square wave that the Arduino can produce. You can watch a demonstration video of the voice sounds and effects of piezoelectric buzzers using the voice MCU. an Auto Transformer and a 'black blob' of circuitry. Go to the dollar store and purchase their Intruder Alert noise maker and your'll find.
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