This circuit was found in the 1990 Motorola Dataar Linear. We can mount it with more modern equivalent transistors. Output transistors shall be provided with heat radiators.
This circuit uses a PNP transistor to modulate a low power infrared LED. Observe the polarity of...
The integrated circuit used in this configuration is uncommon today. The diodes are for general use...
Although the integrated used originally is uncommon today, more modern operating equivalents can...