| 摘要 |
PURPOSE: A D-class power amplifier including an output transformer for an exclusive broadcasting system is provided to increase output by connecting the output transformers for transmitting constant voltages from each other. CONSTITUTION: First and second preamplifier units(31,32) amplify inputted sound and voltages. A first power amplifier unit(41) and a second power amplifier unit(42) amplify each sound outputted from the first and the second preamplifier. A first and a second output transformer(T1,T2) transmit constant voltages of the first and the second power amplifier unit. A relay(K1) controls the first and the second output transformer according to the operation of a mode selection switch(S1). First and second speakers(51,52) are connected to the first and the second output transformers. [Reference numerals] (31) First preamplifier(CHANNEL1); (32) Second preamplifier(CHANNEL2); (41) First power amplifier(CHANNEL1); (42) Second power amplifier(CHANNEL2); (51,52) Speaker(LOAD) |
