| 摘要 |
1,024,821. Transistor oscillating circuits. GLOBE INDUSTRIES Inc. Oct. 12, 1962 [Oct. 20, 1961], No. 38805/62. Heading H3T. A transistor oscillator incorporates a starting network 50 which includes a starting transistor 54 connected to deliver starting bias to the oscillator and cut-off means actuated by oscillation of the oscillator and adapted to effect permanent cut-off of the starting transistor as long as the oscillator remains in its running condition. In the circuit shown the oscillator comprises transistors 10, 12 connected in pushpull and employing saturable transformer 32. The starting network comprises a voltage divider 51, 52 and the emitter-collector path of transistor 54 connected across the supply 18, the impedance of the emitter-collector path of transistor 54 being determined by the bias set by resistor 56 and transistor 58. After starting of the oscillator transistors 54 and 58 are cut off by means of a bias derived from transformer 32 and rectified by diodes 64, 66. The bias signal may alternatively be picked off on a small bias winding on transformer 24. Resistor 52 may be omitted. |
