Relays… why? why not use SCR? or cut power to the amp? Some amp comes with a Mute pin.Wavicle wrote: ↑Sun Jul 23, 2023 10:30 pm The "orange thing" is the audio mute relay. It produces the "click" sound when you reset the computer. It actually looks like maybe the "hot spot" is the standoff for VERA connected to the PCB, not the relay. Maybe it is reflecting something.
U10 is the 3.3V linear regulator. 1/3 of all power drawn from the 5V rail is dumped as heat within that part. This is pretty much expected.
U11 is the video amplifier for composite and s-video. That one surprises me a little bit. Not sure what's going on there.
LDO, I think I saw a switching PSU circuit, I don't quite understand why not using muti voltage switching chip for 3V3 as well.
Sure…LDO is cheap, some how I think there is more reason to using LDO for IO bank that I missed.
Ripple?
well, he is using composite so there will be current on the output driver of the amp which I think is the reason for heat gen.
Do note, tho looks scary, it's only 30ish degree.