Abstract: A driving method and an apparatus for a light emitting device have a simple configuration and activate the device at an accurate luminous intensity. The apparatus includes a power supply which outputs a function of time in synchronization with a timing pulse determining a lighting period, a k-multiplied timing pulse generating part which generates a timing pulse for a period multiplied by 1/k and a control information storing part which stores control information to decide which one of the generated n timing pulses is used. Appropriate pulses generated by said k-multiplied timing generating device are passed based on information stored in said control information storing device and the output from the power supply is sampled using the pulses passed, to activate the light emitting device.

Abstract: A radio station presetting method for radio receivers performs seek-scanning to select a predetermined number of radio stations with a reception field strength higher than a specified level in descending order of reception field strength and to set data of the selected stations in a station-presetting memory. A predetermined number of radio stations with a reception field strength higher than the specified level which are not set in the station-presetting memory are stored in a second memory. Each time specific station data set in the station-presetting memory is desired to be deleted, the specified station data from the station-presetting memory is deleted and station data in the second memory with the highest reception field strength is written into the station-presetting memory and erased from the second memory.