This circuit provides a few watts of output and can be used in the car as an auxiliary amplifier. Transistors must be mounted on heatsinks and the speaker can be 4 ohms or 8 ohms.
The circuit shown in the figure is a more sensitive version of the previous one (CB16105E). Two...
Found in an EEE this circuit uses FETs of the time and a bipolar one. Current equivalent...
The recommended distance between the emitter and the phototransistor is 10 mm for this...