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First thought: How often is the yellow read/write LED on the pi flashing or 'always on' when the freezes occur? I surf with chromium and often have 15 tabs, or more, open. Depending on the sites (the default gmail page uses lots of memory and you should use their basic html page instead), any more tabs, and the Memory is used up (checking it with gnome-...


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You can’t use a voltage divider for this type of load, and using e.g. a LM1117T would only give you ~800mA. And it surges a bit when it is powered up. Don’t feed 3V3 directly to the Pi. More likely the culprit is the 5V SMPS you are using to power the Pi, and not the regulator itself. Use an LM350 to supply power... You may still get the 50/60Hz humming ...


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Try to understand how minimodem output redirection work: man minimodem|minimodem --tx -8 1200|tee /tmp/datas.wav du -h /tmp/datas.wav 0 /tmp/datas.wav man minimodem|minimodem --tx -8 1200 -f /tmp/datas.wav du -h /tmp/datas.wav 6.4M /tmp/datas.wav Try to understand how aplay output redirection work: aplay /tmp/datas.wav|tee /tmp/aplay_stdout.datas du ...


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As you know PiFm is a great bench experiment but a very dirty RF transmitter. While it will produce a noisy output across several frequencies, it will do so with very limited power. The project author reports a range of approximately 10cm without an antenna attached (and 100m with). This will vary depending on your power source, other attachments, noise ...


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You will be probably better off investing in a Red Pitaya board for running RF experiments like software defined radio. Also, consider becoming a radio amateur (ham). The entry level exam is no longer that difficult as it once used to be. (I passed it as a kid.) With an amateur radio license you are allowed to run legal RF experiments with much higher power ...


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