| 摘要 |
949,510. Transistor oscillating circuits. FIELDEN ELECTRONICS Ltd. Feb. 15, 1962 [Feb. 20, 1961], No. 6101/61. Heading H3T. In a transistor oscillator a tuned circuit 2 in the collector circuit is back-coupled to the emitter by means of two series-connected seconary windings 6, one of which gives positive and the other negative feedback. The relative amounts of feedback are varied by means of an axially movable magnetic core 5 having a critical position, at which the arrangement goes into oscillation. Oscillations are detected by a transistor detector/amplifier 11 coupled to the circuit 2 by means of winding 7 and which produces a D.C. output at its collector which depends upon whether oscillations occur and which is proportional to the movement of the core over the oscillation range. |
