defragster
Senior Member+
Connecting a new Prop_LC I discovered the AMP end chip would quickly heat to 'too hot' to touch a few seconds after powering up and pin 5 was set output HIGH.
Using the Beta PROP shield I got - with the same wires to the same Teensy that device does not display this behavior.
Note: Using TALKIE and the correct Teensy DAC I can hear the audio clear and true, but the AMP chip goes hot in ~10 seconds. Pulling the 5V line kills the sound and the heat. A quick check of a couple pins doesn't show any power/GND shorts. I saw this behavior the other week and set it aside. I just Brushed solder resin off with 90% isopropyl and it is much cleaner - and there may have been some spatter on the side of the '473' chip adjacent the AMP pin that is clear now. But after drying it repeats the hot behavior.
End pins soldered underneath and pins clipped are GND/PGM/DAC and seem clear of anything that would affect this.
Here is a pic of the topside where I put the side headers on - I don't see anything obvious:
Anything else I can check or fix? Something obvious I did to affect it?
Using the Beta PROP shield I got - with the same wires to the same Teensy that device does not display this behavior.
Note: Using TALKIE and the correct Teensy DAC I can hear the audio clear and true, but the AMP chip goes hot in ~10 seconds. Pulling the 5V line kills the sound and the heat. A quick check of a couple pins doesn't show any power/GND shorts. I saw this behavior the other week and set it aside. I just Brushed solder resin off with 90% isopropyl and it is much cleaner - and there may have been some spatter on the side of the '473' chip adjacent the AMP pin that is clear now. But after drying it repeats the hot behavior.
End pins soldered underneath and pins clipped are GND/PGM/DAC and seem clear of anything that would affect this.
Here is a pic of the topside where I put the side headers on - I don't see anything obvious:
Anything else I can check or fix? Something obvious I did to affect it?