Automobile radio control circuit responsive to speed

Claim 1

AN AUTOMOBILE RADIO RECEIVER HAVING A SPEED COMPENSATED OUTPUT, INCLUDING IN COMBINATION, AN AUDIO AMPLIFIER HAVING FIRST AND SECOND TRANSISTOR STAGES, A FIRST VARIABLE RESISTOR COUPLING SAID FIRST TRANSISTOR STAGE WITH SAID SECOND TRANSISTOR STAGE TO CONTROL THE OUTPUT OF SAID AUDIO AMPLIFIER, A PHOTOCELL CONNECTED IN PARALLEL WITH SAID FIRST VARIABLE RESISTOR WHICH DECREASES AS THE LIGHT INCELL HAVING A RESISTANCE WHICH DECREASES AS THE LIGHT INTENSITY INCREASES, A LAMP MOUNTED PROXIMATE SAID PHOTOCELL AND HAVING AN INTENSITY WHICH VARIES WITH THE EXCITATION CURRENT SUPPLIED THERETO, AN ENERGIZING BRIDGE CIRCUITFOR SAID LAMP INCLUDING A SELF-HEATING THERMISTOR FOR CONTROLLING THE EXCITATION CURRENT SUPPLIED TO SAID LAMP AND A SECOND VARIABLE RESISTOR FOR SETTING THE AMOUNT OF EXCITATION CURRENT REQUIRED TO EXCITE SAID LAMP, SAID THERMISTOR HAVING A RESISTANCE WHICH INCREASES AS ITS TEMPERATURE DECREASES AND BEING MOUNTED IN THE AIR STREAM OF THE AUTOMOBILE TO BE COILED THEREBY ACCORDING TO THE SPEED OF THE AUTOMOBILE, SAID BRIDGE CIRCUIT BEING CONSTRUCTED SO THAT THE VOLTAGE ACROSS SAID LAMP AND THE CURRENT SUPPLIED THERETO INCREASES AS THE RESISTANCE OF SAID THERMOSISTOR INCREASES, WHEREBY THE RESISTANCE OF SAID THERMOSISTOR WILL INCREASE AS SPEED INCREASES CAUSING GREATER INTENSITY OF LIGHT FROM SAID LAMP TO REDUCE THE RESISTANCE OF SAID PHOTOCELL AND BYPASS SAID FIRST VARIABLE RESISTOR, INCREASING THE AMOUNT OF SIGNAL SUPPLIED TO SAID SECOND TRANSISTOR STAGE TO INCREASE THE OUTPUT OF SAID AUDIO AMPLIFIER.