Previously I wrote about the TEA2025B amplifier becoming very hot. So hot that I decided to reduce the voltage of the circuit from 9V to 4.5V. The same amplifier in the current breadboard is not hot at all even at 9V! Not surprisingly since the heat generated by the amplifier is proportional to the square amperage.
The lesson here that when that even the unsuspected elements can be a variable in experiments.
|Redoing experiment 29 and 30 on another breadboard was worth. At 8,9V the circuit only needs 40mA. Not only did I get rid of all the noise also the circuit needed only one fifth of the amperage. Visible on this image is part 2 of experiment 29.|