Timeline for Hiss when using a Raspberry Pi and an audio amplifier on same power supply
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 4, 2022 at 20:08 | vote | accept | Simon StJohn-Green | ||
| Jul 4, 2022 at 20:06 | comment | added | Simon StJohn-Green | Makes sense, thanks @TypeIA. I'd forgotten about the efficiency aspect! | |
| Jul 4, 2022 at 17:52 | comment | added | TypeIA | 0.2 A at 12 V is 6 watts. Assuming (ballpark) 85% efficiency, your 5 V output current is 1.02 amps... which exceeds your DC/DC rating. (Still, may well be unrelated to your audio issue.) | |
| Jul 4, 2022 at 17:47 | comment | added | Simon StJohn-Green | @TypeIA it is a model 3 B. I thought it was probably OK because: 1. According to my 12v supply it's drawing ~.2A at 12V with just the pi plugged in (probably low because I'm not using any USB devices or screen or anything like that, just a couple things on the GPIO pins). 2. The rpi itself doesn't complain about being throttled via vcgencmd get_throttled. | |
| Jul 4, 2022 at 16:05 | comment | added | TypeIA | It appears to be a 1 A DC/DC (so 5 W). This is still marginal for a Pi 4 but might be okay for an older Pi (you should check this out). | |
| Jul 4, 2022 at 13:18 | answer | added | Mattman944 | timeline score: 1 | |
| Jul 4, 2022 at 13:04 | comment | added | TypeIA | 1 watt is nowhere near enough for a Raspberry Pi. It might not be the cause of your hiss/hum, but you are overloading the DC/DC. | |
| Jul 4, 2022 at 13:01 | comment | added | TypeIA | Which is it, a hiss or a hum? If hum, is it 50/60 Hz (you can find 50/60 Hz tone clips online to compare)? | |
| Jul 4, 2022 at 12:48 | history | edited | JRE | CC BY-SA 4.0 |
added 10 characters in body; edited title
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| S Jul 4, 2022 at 12:43 | review | First questions | |||
| Jul 4, 2022 at 15:41 | |||||
| S Jul 4, 2022 at 12:43 | history | asked | Simon StJohn-Green | CC BY-SA 4.0 |