| 摘要 |
PURPOSE:To suppress variation in oscillation output current with a power voltage, by grounding the base of a transistor (TR), connected to the secondary coil of an oscillation transformer, through diodes. CONSTITUTION:One terminal of the secondary coil of an oscillation transformer 19 is connected to the collector of a TRQ2. The other terminal of the coil is connected to the base of the TRQ2 through a feedback circuit 23. The connection point between the circuit 22 and TRQ2 is grounded through diodes D1 and D2. The emitter of the TRQ2 is grounded through a resistance R3. In this constitution, even if a power voltage +B varies, the base potential of the TRQ2 is held nearly constant by the diodes D1 and D2. Since the base-emitter voltage of the TRQ2 is constant, the terminal potential of the resistance R3 is held nearly constant. Consequently, a nearly constant current flows through the resistance R3 and an oscillation output current is stabilized. |
