This circuit is from 2005 documentation. The integrated amplifier circuit must be mounted on a good heat sink and the speaker must be able to withstand the full power of the circuit.
This 600-ohm output impedance circuit was found in a Radio Electronics from October 1963. The...
Used with infrared remotes at the time, this circuit was found in a 1991 RE Experimenter Handbook....
The circuit presented was obtained in a technical documentation from National Instruments. The...