DC voltage supplied transmitting device e.g. for IR remote opening and closing of motor vehicle windows and doors

摘要

The transmitting arrangement includes a transistor in a final stage, over whose emitter-collector path a DC voltage is connected to a transmitting diode. The transistor base is connected with a transmitting port of a micro-controller for the supply of transmitting pulses. An RC circuit (18, 20) is connected between the transistor (14) and the transmitting port (11) of the micro-controller (10) for a DC voltage decoupling. The transistor is controlled by the transmitting pulse differentiated in the RC circuit, and the control time of the transistor is determined by the time constant of the RC circuit.