PicoMite: driving a passive buzzer

Author	Message
thwill Guru Joined: 16/09/2019 Location: United Kingdom Posts: 4354	Posted: 12:02am 29 Nov 2022         phil99 said   The average voltage on the Pico pin should be about 1.65V and the frequency 44.1kHz even with no modulation. If you can get that measure V and f on the base and collector. I would expect the average readings to be 0.3V B-E and 2.5V C-E with  44.1kHz on both. I have the worlds worst DSO (the wife downvoted investing in a good one until my 50th birthday) and with OPTION AUDIO GP0,GP1 configured and no sound being played I am seeing a square(ish) wave at ~11.2 KHz and a Vavr of 1.45V on GP0 & GP1. With a sound nominally playing the peaks and troughs pulse horizontally which is presumably the result of the "audio signal superimposed" ? Remember I know nothing about any of this . Anyway, it's goodnight from Blighty, Best wishes, Tom