220247 ⎘
Gain control in amplifiers or frequency changers without distortion of the input signal; Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors
COMPENSATION METHOD FOR CHARACTERISTIC DIFFERENCE OF PHOTOELECTRIC ELEMENT
#2VARIABLE GAIN AMPLIFIER
#3Audio amplifier with duty ratio control
#4ELECTRONIC DEVICE AND CONTROL METHOD THEREOF
#5Field effect transistor circuits
#6Regulation of an RF amplifier
#7Linearized dynamic amplifier
#8Audio amplifier system
#9Delay adjustment
#10Amplifier circuit and method of amplifying a signal in an amplifier circuit
#11Amplifier circuit
#12Amplifier bias control
#13Amplifier circuit and method of amplifying a signal in an amplifier circuit
#14Amplifier circuit and method of amplifying a signal in an amplifier circuit
#15Amplifier circuit
#16Miniature speaker device and television set
#17Method of limiting the maximum permitted sound volume in an earphone, and an earphone for carrying out the method
#18Automatic gain control circuit for volume control and corresponding method for volume control
#19Apparatus and method for adjusting sound volume for televisions and other audio systems
#20Field effect transistor circuits